Dual 56K LAN Modem
User Guide
MODEL NO.
3C888
Part No. 1.018.1752
Published May 2000
http://www.3com.com/
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IMPORTANT SAFETY INFORMATION
Important Safety
Information
WARNING: Warnings contain directions that you must follow for your personal safety. Follow all
instructions carefully.
Please read the following information carefully and thoroughly before installing the unit:
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Take exceptional care during the installation and removal of the unit.
Locate the unit close to the mains socket outlet, and ensure that the mains socket is accessible.
Use the power adapter supplied with the unit to ensure compliance with national and
international safety standards. If there is no power adapter supplied, the mains cordset used must
be compliant with the local and national regulations of the target country and must not violate
the safety approval of the product (refer to the Approvals section at the back of this manual).
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Disconnect the power adapter before moving the unit. Power can only be disconnected from the
unit by removing the power adapter from the unit or from the socket outlet.
Only connect apparatus complying with the relevant interface requirements to the ports on this
unit. The safety status of the ports on this equipment are as follows.
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Ports identified by the labels LAN and Phone = SELV.
SELV (Safety Extra Low Voltage) is a secondary circuit which is designed and protected so that
under normal and single-fault conditions, the voltage between any two accessible parts does
not exceed a safe value (42.2 V peak or 60 V DC).
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There are no user-replaceable fuses or user-serviceable parts inside the unit. If there is a physical
problem with the unit that cannot be solved with problem solving actions in this guide, contact
the 3Com reseller from whom the equipment was purchased.
If the units are stackable, only stack similar units.
WARNING: Twisted Pair RJ45 data ports. These are shielded RJ45 data sockets. They cannot be
used as telephone sockets. Only connect RJ45 data connectors to these ports.
Wichtige
Sicherheits-Informatio
nen
WARNUNG: Warnungen enthalten Anweisungen, die Sie zu Ihrer persönlichen Sicherheit befolgen
müssen. Bitte halten Sie sich daran.
Bitte lesen Sie die folgenden Informationen aufmerksam, ehe Sie die Einheit installieren:
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Lassen Sie bei Installation und Abbau besondere Vorsicht walten.
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Stellen Sie die Einheit in der Nähe einer Stromquelle auf und achten Sie darauf, daß diese
zugänglich ist.
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Verwenden Sie immer den mitgelieferten Netzadapter, damit die Einhaltung nationaler und
internationaler Sicherheitsnormen gewährleistet ist. Wurde kein Adapter mitgeliefert, muß das
verwendete Netzkabel den lokalen und nationalen Bestimmungen des Landes entsprechen und
darf die Sicherheitsbestimmungen des Produkts (siehe den entsprechenden Abschnitt am Ende
dieses Handbuchs) nicht verletzen.
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Trennen Sie den Netzadapter von der Stromversorgung, bevor Sie die Einheit bewegen. Die
Einheit kann nur von der Stromversorgung getrennt werden, indem Sie die Verbindung des
Netzadapters entweder von Einheit oder der Stromquelle trennen.
Schließen Sie nur Geräte an den Schnittstellen dieser Einheit an, die den
Interface-Voraussetzungen entsprechen. Die Sicherheitsmerkmale der Schnittstellen dieses Geräts
sind:
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Schnittstellen mit der Bezeichnung LAN und Phone = SELV. SELV (Safety Extra Low Voltage) ist
ein sekundärer Schaltkreis, der unter normalen und Single-Fault-Bedingungen so eingerichtet
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ist, daß die Spannung zwischen zwei zugänglichen Bauteilen einen Sicherheitswert nicht
übersteigt (42,2 V Spitzenspannung bzw. 60 V Gleichspannung).
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Die Einheit enthält keine Sicherungen oder sonstige Bauteile, die vom Benutzer ausgewechselt
oder gewartet werden können. Sollte ein physikalischer Fehler auftreten, der mit den in diesem
Handbuch beschriebenen Maßnahmen nicht zu beheben ist, setzen Sie sich mit dem
3Com-Vertreter in Verbindung, bei dem Sie das Gerät erworben haben.
Bei stapelfähiger Konstruktion nur gleichartige Einheiten verwenden.
WARNUNG: Twisted Pair RJ45-Datenschnittstellen. Dies sind abgeschirmte RJ45-Schnittstellen,
die nicht für Telefonsignale verwendet werden können. Schließen Sie an diesen Schnittstellen nur
RJ45-Datenstecker an.
Important Notice de
Securite
AVERTISSEMENT: les avertissements présentent des instructions que vous devez suivre très
attentivement pour votre sécurité personnelle.
Veuillez lire les informations suivantes attentivement avant l'installation de l'appareil.
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Soyez très prudents pendant toute la durée de l'installation et du déplacement de l'appareil.
Placez l'appareil près d'une prise murale qui doit rester accessible à tout instant.
Utilisez l'adaptateur électrique fourni avec l'appareil pour garantir la conformité totale aux
normes de sécurité nationales et internationales. Si aucun adaptateur n'est fourni, le câble
électrique utilisé doit être conforme aux normes locales et nationales du pays et ne doit en aucun
cas contrevenir aux normes de sécurité d'utilisation de l'appareil (veuillez consulter la section
Approvals (Agréments) au dos du présent manuel).
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Déconnectez l'adaptateur électrique avant de déplacer l'appareil. L'alimentation ne peut être
déconnectée de l'appareil qu'en retirant l'adaptateur de l'appareil ou de la prise de courant.
Ne connectez l'appareil qu'en conformité avec les exigences techniques des ports de connexion
de l'appareil. Les normes de sécurité de chaque port sont les suivantes :
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Les ports identifiés par les étiquettes LAN et Phone = SELV.
Les circuits SELV (Safety Extra Low Voltage, très basse tension de sécurité) sont des circuits
secondaires qui sont conçus et protégés pour qu'en conditions normales et à défaillance
unique, la tension n'excède jamais la valeur de sécurité de 42,2 V en crête, ou 60 V DC.
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L'appareil ne contient aucun fusible remplaçable par l'utilisateur ni aucune pièce dont la
maintenance peut être effectuée par l'utilisateur. Si un problème physique survient dans
l'appareil, qui ne peut être résolu au moyen des techniques de dépannage du présent manuel,
contactez le revendeur 3Com qui vous a fourni l'appareil.
Si vous disposez de plusieurs appareils empilables sur racks, n'empilez que les appareils similaires.
AVERTISSEMENT: ports de données RJ45 à paires torsadées. Il s'agit de prises de données RJ45
blindées. Elles ne peuvent être utilisées comme prises de téléphone. Elles ne doivent recevoir que les
connecteurs de données RJ45.
Medidas de Seguridad
Importantes
ADVERTENCIA: las advertencias contienen instrucciones que es preciso seguir al pie de la letra para
evitar daños personales.
Antes de instalar la unidad, lea atentamente la siguiente información.
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Tome todas las precauciones necesarias a la hora de instalar o desinstalar la unidad.
Coloque la unidad cerca de una toma de corriente de fácil acceso.
Utilice el adaptador de corriente suministrado con la unidad, de este modo se asegura el pleno
cumplimiento de las normas de seguridad nacionales e internacionales. En caso de no recibir un
adaptador con la unidad, deberá utilizar un cable que responda a los requisitos estipulados por la
normativa local o nacional pertinente y que no contravenga la garantía de seguridad del producto
(consulte la sección relativa a este punto al final de esta guía).
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Desenchufe el adaptador antes de mover la unidad. La única forma de interrumpir el paso de
corriente consiste en desenchufar el adaptador de la unidad o de la toma de corriente.
No deben conectarse a los puertos de la unidad aparatos que no cumplan los requisitos de la
interfaz en uso. Los puertos de la unidad son de los siguientes tipos:
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Puertos con etiqueta LAN o Phone= SELV.
SELV (Safety Extra Low Voltage) es un circuito secundario diseñado para que el voltaje entre
dos puntos accesibles no exceda límites seguros (42,2 V punta ó 60 V CC) en circunstancias
normales o de fallo simple.
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La unidad no contiene fusibles ni otros componentes que el usuario pueda cambiar o reparar. De
producirse problemas cuya resolución no se explique en esta guía, póngase en contacto con el
proveedor de 3Com.
Si las unidades que posee son apilables, acople las que sean similares entre sí.
ADVERTENCIA: puertos de datos de par trenzado RJ45. Son enchufes blindados RJ45 a los que
sólo deben acoplarse conectores de datos RJ45. No pueden utilizarse como enchufes telefónicos.
Informazioni
Importanti per la
Sicurezza
AVVERTENZA: il testo delle avvertenze riporta importanti istruzioni alle quali occorre attenersi per
motivi di sicurezza. Seguire attentamente tutte le istruzioni.
Prima di installare l'unità, leggere attentamente le informazioni riportate di seguito.
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Procedere con estrema cautela durante l'installazione e la rimozione dell'unità.
Collocare l'unità vicino a una presa di corrente e verificare che la presa sia accessibile.
Per garantire la conformità alle norme di sicurezza nazionali e internazionali, usare l'adattatore di
corrente fornito con l'unità. Se l'adattatore non è compreso, il cavo alimentatore deve essere
conforme alle norme locali e nazionali del paese di destinazione nonché all'omologazione di
sicurezza del prodotto (per ulteriori informazioni consultare la sezione relativa alle omologazioni
riportata alla fine del manuale).
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Scollegare l'adattatore prima di spostare l'unità. Per scollegare l'unità occorre rimuovere
l'adattatore dall'unità stessa o dalla presa di corrente.
Collegare alle porte dell'unità solamente apparecchi conformi ai requisiti della relativa interfaccia.
Le specifiche riguardanti la sicurezza delle porte sono le seguenti:
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Porte contrassegnate dalle targhette LAN e Phone = SELV. SELV (Safety Extra Low Voltage) è
un circuito secondario ideato e protetto in modo tale che, in condizioni normali e in caso di
un unico guasto, la tensione tra due parti accessibili qualsiasi non superi il valore di sicurezza
(42,2 V picco o 60 V CC).
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All'interno dell'unità non vi sono fusibili sostituibili dall'utente o parti la cui manutenzione può
essere effettuata dall'utente. Se si verifica un problema che non si è in grado di risolvere
seguendo le istruzioni per la risoluzione dei problemi riportate nel presente manuale, contattare il
rivenditore 3Com presso il quale si è acquistata l'unità.
Se le unità sono impilabili, impilare solamente unità simili.
AVVERTENZA: porte dati RJ45 per doppino intrecciato. Si tratta di prese dati RJ45 schermate e
non possono essere utilizzate come prese telefoniche. Collegare solamente connettori dati RJ45 a
queste porte.
Additional Safety
Information
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Only connect apparatus complying with the relevant interface requirements to the ports on
this unit.
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Disconnect the power adapter before moving the unit.
Retain this user’s guide for later use and pass it on in the event of change of ownership of
the unit.
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Protect the unit from sudden, transient increases and decreases in electrical power by fitting
an in-line surge suppressor or uninterruptible power supply. Products manufactured by us
are safe and without risk provided they are installed, used and maintained in good working
order in accordance with our instructions and recommendations.
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If any of the following conditions occur, isolate the electricity supply and refer to your 3Com
reseller.
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If the case or cover is not correctly fitted or if it is damaged.
If the unit begins to make an odd noise, smell or smoke.
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If the unit shows signs of a distinct change in performance.
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Never install telephone wires during a lightning storm, or install telephone connection
sockets in wet locations, unless the socket is specifically designed for wet locations.
Do not touch uninstalled telephone wires or terminals unless the telephone line has been
disconnected at the network interface. Always exercise caution when installing or modifying
telephone lines.
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Do not use a telephone, which is connected to the unit, to report a gas leak in the vicinity of
the leak.
Do not spill food or liquids on the unit. If the unit gets wet, isolate the electrical supply and
contact your 3Com reseller.
Do not push any objects into the openings of the unit. Doing so can cause fire or electric
shock by shorting out internal components.
Only equipment approved for use by your telecom company can be connected to the
telephone port.
Avoid using a telephone, which is connected to the unit (other than a cordless type), during
an electrical storm.
Equipment connected to the telephone port must be located in the same building as the
unit.
Be sure nothing rests on the units system cables and that the cables are not located where
they can be stepped on and cause damage to the unit.
Keep the unit away from radiators and heat sources. Allow 25mm (1inch) around the unit to
provide adequate air circulation.
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Install the unit in a clean area that is free from dust or extreme temperatures.
Allow a clearance gap of at least a 150 mm (6 inches) from the rear panel of the unit, to
allow for cable access.
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Interconnecting directly, or by way of other apparatus, to ports complying with SELV
requirements may produce hazardous conditions on the network. Advice should be sought
from a competent engineer before such a connection is made.
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TABLE OF CONTENTS
ABOUT THIS GUIDE
Introduction 11
How to Use This Guide 11
Conventions 12
Year 2000 Compliance 12
DUAL 56K LAN MODEM
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CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK
ACCESS
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ABOUT THIS GUIDE
About This Guide provides an overview of this User Guide, describes guide
conventions, and shows you where to look for specific information.
Introduction
This guide tells you how to install and configure the Dual 56K LAN Modem and
provides descriptions of key applications and networking concepts.
Audience Description This guide is intended for end users with no presumed level of expertise.
How to Use
This Guide
Table 1 Specific Information
If you are looking for...
Turn to...
An overview of the Dual 56K LAN Modem
A description of the Dual 56K LAN Modem hardware components
An explanation of the Dual 56K LAN Modem’s key functionality
Instructions on checking TCP/IP and IP address settings
Instructions on installing the Dual 56K LAN Modem
Instructions on configuring the Dual 56K LAN Modem for Internet access
Instructions on advanced configuration of the Dual 56K LAN Modem
Instructions on configuring the Dual 56K LAN Modem for dial-in support
Information on troubleshooting and maintenance
Background information on networking
Information on installing and using the Virtual FAX Modem application
Information on creating a virtual private network (VPN) tunnel
Dual 56K LAN Modem factory default settings
Technical specifications for the Dual 56K LAN Modem
Glossary definitions for terms used in this guide
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12
ABOUT THIS GUIDE
Conventions
Table 2 Notice Icons
Icon
Notice Type
Alerts you to...
Information note
Important features or instructions
Caution
Warning
Risk of personal safety, system damage, or loss of data
Risk of severe personal injury
Table 3 Text Conventions
Convention
Description
Commands
The word “command” means you must enter the command exactly as
shown in text and press the Return or Enter key. Example:
To remove the IP address, enter the following command:
SETDefault!0 -IP NETaddr = 0.0.0.0
NOTE: This guide always gives the full form of a command in
uppercase and lowercase letters. However, you can abbreviate
commands by entering only the uppercase letters and the appropriate
value. Commands are not case-sensitive.
The words “enter”
and “type”
When you see the word “enter” in this guide, you must type
something and then press the Return or Enter key. Do not press the
Return or Enter key when an instruction simply says “type.”
[Key] names
Key names appear in text in one of two ways:
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Referred to by their labels, such as “the Return key” or “the Escape
key”
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Written with brackets, such as [Return] or [Esc].
If you must press two or more keys simultaneously, the key names are
linked with a plus sign (+). Example:
Press [Ctrl]+[Alt]+[Del].
Menu commands
and buttons
Menu commands or button names appear in italics. Example:
From the Help menu, select Contents.
Words in italicized
type
Italics emphasize a point or denote new terms at the place where they
are defined in the text.
Words in bold-face Bold text denotes key features.
type
Year 2000 Compliance
The OfficeConnect LAN Modem is Year 2000 compliant. Specifically, its system
clock is capable of accepting and storing dates including and beyond the year
2000. For information on Year 2000 compliance and 3Com products, visit the
3Com Year 2000 web page: http://www.3com.com/products/yr2000.html.
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INTRODUCTION
1
This chapter provides an overview of the OfficeConnect® Dual 56K LAN Modem,
referred to throughout this document as the Dual 56K LAN Modem, or simply as
the LAN Modem.
Introduction
The Dual 56K LAN Modem is an easy-to-install, Local Area Network (LAN) to Wide
Area Network (WAN), analog IP router. The LAN Modem provides four 10BASE-T
Ethernet ports for LAN-side connections and two internal, V.90 ITU 56K-standard
modems for WAN-side connections, plus two additional analog ports for standard
analog equipment such as a phone and/or fax machine.
To configure the Dual 56K LAN Modem, you use a standard web browser on a
computer attached to the LAN Modem to access the LAN Modem’s web-based
configuration screens. Afterwards, you can attach up to three additional
computers directly to the LAN Modem, or a combination of external hubs and
computers, to create WAN access for up to 25 users.
Dial-in and Dial-out The Dual 56K LAN Modem supports both dial-in and dial-out remote access. This
Access means that you can use the LAN Modem on either end of a LAN-to-WAN
connection: to call out from your local LAN to an already existing network (such as
the Internet or a private, corporate network), or to receive calls into your LAN from
up to ten previously-defined remote sites. For calls to a private network via the
Internet, where security is a consideration, the LAN Modem also supports
pass-though VPN (Virtual Private Network) tunneling.
Dual 56K Analog The V.90 56K ITU standard used on each of the Dual 56K’s internal modems
Modems provides download speeds of up to 56K1 for each analog line. The two modems
can be accessed independently on a first-come, first-served basis by any
combination of users dialing out from the LAN and users dialing in to the LAN for
separate, 56K connections. Or, the LAN Modem can be configured to provide one
high-speed connection at a time.
The Dual 56K LAN Modem is software upgradeable, allowing for easy upgrades to
new features and enhancements as they become available. Visit the LAN Modem
Web site for the latest firmware releases:
http://www.3com.com/support/docs/lanmodem.
1.Capable of receiving downloads at up to 56 Kbps and sending at up to 31.2 Kbps. Due to FCC regu-
lations, receiving speeds are limited to 53 Kbps. Actual speeds may vary. Requires compatible analog
phone line and server equipment. The Dual 56K LAN Modem complies with the V.90 ITU standard and
is backwards-compatible with all US Robotics 56K standards. Standard officially determined in February,
1998; ratified in September, 1998.
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14
CHAPTER 1: INTRODUCTION
Applications
The primary applications for the Dual 56K LAN Modem are:
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Local networking with shared, dial-out access to the Internet
Local networking with shared, dial-out access to a private network, such as a
remote corporate office LAN (this can include indirect Internet access through
the private network’s Internet connection)
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Local networking with shared, simultaneous dial-out access to the Internet and
a private network
Combined dial-in and dial-out access for several possible networking scenarios
The following diagrams illustrate the primary Dual 56K LAN Modem applications:
Local Networking with Users can share access to the Internet while they continue to network locally, as
OfficeConnect
Dual 56K LAN Modem
Public telephone
Internet
MODEM
CD RD
1
MODEM
CD RD
2
LAN Status
Message
Power
AA
SD
OH
AA
SD
OH
TX
COLL
1
2
3
4
network
OfficeConnect Dual 56k LAN Modem
Alert
Two analog POTs lines
Figure 1 Local Networking with Shared Internet Access
Local Networking with Users can share access to a remote private network, such as a corporate office
Shared Private Network LAN, while they continue to network locally. This can include indirect access to the
Internet
c
o
n
n
e
c
ted
M
o
r
3
Com
OfficeConnect
Dual 56K LAN Modem
Public telephone
network
MODEM
CD RD
1
MODEM
CD RD
2
LAN Status
Message
AA
SD
OH
AA
SD
OH
TX
COLL
1
2
3
4
OfficeConnect Dual 56k LAN Modem
Alert
Power
Dedicated or
leased line
connection
3
o
C
O
NS
O
ET
LE
KN
S
T
y
s
t
0
0
t
A
c
c
e
s
s
S
C
m
L
A
N
S
U
P
E
R
R
W
e
m
o
L
K
P
o
w
e
r
R
X
T
A
C
B
R
I
I
D
N
U
D
3
4
S
D
2
1
/
3
2
1
S
L
A
N
A
L
O
G
4
3
1
2
O
T
1
S
L
Two analog POTS lines
Private network
Figure 2 Local Networking with Remote Private Network Access
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Applications
15
Local Networking with Users can share simultaneous access to both the Internet and a remote private
Internet and a Private
Network
Internet
OfficeConnect
Dual 56K LAN Modem
Public telephone
MODEM
CD RD
1
MODEM
CD RD
2
LAN Status
Message
Power
AA
SD
OH
AA
SD
OH
TX
COLL
1
2
3
4
network
OfficeConnect Dual 56k LAN Modem
Alert
nnected
More co
3
Com
Two analog POTS lines
3
o
C
O
N
SO
ET
LE
KN
S
T
t
s
s
y
s
t
m
L
A
X
N
0
0
A
c
c
e
P
E
R
R
e
m
AN
W
o
L
S
C
O
S
U
I
U
D
3
P
S
t
o
w
u
s
r
s
T
X
A
C
K
B
R
I
D
N
4
t
D
2
1
/
3
S
L
A
N
A
L
O
G
4
3
1
2
O
T
1
S
L
Private network
Figure 3 Local Networking with Shared Access to the Internet and a Remote Private
Network
Combined Dial-in and Users can share access to the Internet or a remote private network and continue to
Dial-out Access network locally, while a user dials in for access to a server or servers on the LAN, as
specific applications.)
Internet
or
private network
Workstation
Workstation
MODEM
CD RD
1
MODEM
CR
2
LAN Status
Message
Power
AA
SD
AA
SD
OH
T
C
1
2
3
Public telephone
network
OfficeConnect Dual 56k LAN Modem
Alert
OfficeConnect
Dual 56K LAN Modem
Dial-in modem user
Workstation
Server
Two analog POTs lines
Figure 4 Local Networking and Dial-out Access with Dial-in Support
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16
CHAPTER 1: INTRODUCTION
Hardware Description
The following is an overview of the Dual 56K LAN Modem hardware, including the
function of the front panel LEDs and back panel connectors.
Description
MODEM 1
MODEM 2
LAN Status
Message
Power
AA CD RD SD OH
AA CD RD SD OH
TX COLL
1
2
3
4
OfficeConnect Dual 56k LAN Modem
Alert
Figure 5 Dual 56K LAN Modem Front Panel
LEDs indicate proper operation and display analog modem and Ethernet port
activity status.
Table 4 Front Panel LED Indicator Definitions
LED
Color
Description
Alert
Amber Operational Status. Lit during power-on self-diagnostic test
or after pressing the reset button.
Off indicates that the unit has passed the diagnostic test and
is working properly.
Flashes if one or more of the diagnostics have failed or after
the unit is placed in firmware download mode and is awaiting
firmware upgrade.
Power
Green
Power Indicator. Remains lit as long as power is supplied to
the unit.
Message
Not implemented.
AA (MODEM 1 or 2) Green
Auto Answer. Shows the answer status for Modem 1 or 2,
as follows:
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Flashes during an incoming call.
Remains lit for the duration of the call.
Off when the LAN Modem originates a call.
CD (MODEM 1 or 2) Green
Carrier Detect. Remains lit for the indicated modem if the
Dual 56K LAN Modem receives a valid data signal (carrier)
from a remote modem (such as an ISP), indicating that data
transmission is possible.
RD (MODEM 1 or 2) Green
SD (MODEM 1 or 2) Green
OH (MODEM 1 or 2) Green
Received Data. Flashes when the indicated modem receives
data from a remote site.
Send Data. Flashes when the indicated modem sends data to
a remote site.
Off Hook. Remains lit when the indicated modem has gone
off hook.
TX
Green
Ethernet Transmit Status. Flashes green when data is being
transmitted to the Ethernet LAN from the Dual 56K LAN
Modem.
Off indicates that no data is being transmitted to the Ethernet
LAN from the Dual 56K LAN Modem.
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Hardware Description
17
Table 4 Front Panel LED Indicator Definitions (continued)
LED
Color
Description
COLL
Amber Ethernet Collision Status. Flashes amber when some
collisions are taking place on the Ethernet LAN.
Off indicates that no collisions are taking place on the
Ethernet LAN.
Ports 1-4
Green
Ethernet LAN Port Status. On indicates that the unit
detects the Ethernet link integrity signal from an attached
computer and operation is normal.
Flashes when the LAN Modem receives data on the
associated port.
Off indicates that the unit does not detect the Ethernet link
integrity signal. The Ethernet cable may not be properly
connected or the cable may be the wrong polarity.
Description
1
2
4
10-30V DC
2A MAX
LINE 1 PHONE 1 LINE 2 PHONE 2
3
RESET
LAN
Figure 6 Dual 56K LAN Modem Back Panel
From left to right, the back panel consists of the following:
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Power: Connect the power module cable to this port.
RESET: Press this button to re-initialize or factory re-set the unit (refer to
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LAN 1, 2, 3, and 4: Connect up to four computers (or a combination of
computers and an external hub), to these four 10BASE-T Ethernet ports.
LINE 1: Connect one of the provided RJ-11 analog cables from the wall outlet
to this port.
PHONE 1: Connect an external analog device, such as a telephone or fax
machine, to this port.
LINE 2: Connect the second RJ-11 analog cable from the wall outlet to this
port.
PHONE 2: Connect an additional external analog device, such as a telephone
or fax machine, to this port.
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18
CHAPTER 1: INTRODUCTION
Features
Ease of Installation and Use
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Web-based, point-and-click user interface for easy configuration
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Automatic Internet configuration verification via your Internet Service Provider
(ISP)
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Web-based, context-sensitive online help
Dial-in Wizard for easy configuration of dial-in setup
LAN Modem Desktop Manager tool for easy management and stats
monitoring (Windows 95®, 98®, NT® and 2000®)
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EZ- LAN Wizard, which optimizes workstation settings for use with the Dual
56K LAN Modem (Windows 95, 98, NT and 2000)
High Performance
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Two internal 56K modems, capable of downloading at speeds of up to 112
Kbps1 (without compression)
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V.42/MNP 2-4 error control and V.42 bis/MNP 5 data compression
Hi/fn™ LZS® compression, which conforms to the following IETF RFCs: The PPP
Compression Control Protocol (RFC 1962) and PPP Stacker LZS Compression
Protocol (RFC 1974)
Connectivity
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Two 56K integrated analog modems
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Built-in four-port 10BASE-T, 10 Mbps Ethernet hub. Up to 25 users can be
supported by adding an external Ethernet hub
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Two pass-through, analog voice ports for connecting up to two external analog
devices
Virtual Private Network (VPN) pass-through capability using client software
Virtual FAX Modem
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Allows Windows users on the LAN to access one or both modems as if directly
connected through an RS-232 serial (COM) port.
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Creates support for applications requiring a dedicated modem, such as Class
2.0 fax applications, and online services.
Routing
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IP Routing
Dynamic or static IP addresses supplied by your service provider (WAN side)
Dynamic Host Configuration Protocol (DHCP) server functionality on the LAN,
which automatically assigns an IP address to a newly-attached PC on the IP
network
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Domain Name Service (DNS) server functionality for the LAN, which translates
the common, alphanumeric name of a device (for example,
“www.3com.com”) to its numeric IP address
1.Current FCC rules limit download speeds to 53Kbps per modem.
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Features
19
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Network Address Translation (NAT) between LAN and WAN, which allows
multiple users on the LAN to share a single remote connection and user
account.
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Intelligent NAT, an enhancement to NAT which enables UDP applications to
work with the Dual 56K LAN Modem.
Multiplexing traffic from several computers to remote destinations
Bandwidth Management
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Automatic call initiation (also known as dial-on-demand routing)
Automatic disconnection of idle calls after a specified length of time
Multilink PPP, which combines two PPP calls on two analog lines into a single,
high-speed network connection.
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Bandwidth on Demand using Bandwidth Allocation Control Protocol
(BACP)/Bandwidth Allocation Protocol (BAP), based on a specified threshold.
Dynamic Bandwidth Allocation (DBA), which allows you to place a voice or
data call while a Multilink PPP call is active.
Manual call connection and disconnection
Remote Management
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Remote management via Web browser-based interface
Remote firmware upgrades
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Protocols
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IETF PPP (RFC 1661, 1662, 1663)
IETF Multilink PPP (RFC 1990)
IETF Password Authentication Protocol (PAP) and Challenge Handshake
Authentication Protocol (CHAP) security (RFC 1994)
I
MS-CHAP support (as defined in Network Working Group Information Memo:
Microsoft PPP CHAP Extensions. S. Cob, Rev. 1.3 March 1997 including only
the functionality that keeps with IETF 1994).
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IP address negotiation using IPCP (RFC 1332)
Network Address Translation (NAT) between LAN and WAN (RFC 1631)
Point-to-Point Tunneling Protocol (PPTP—PPTP draft-ietf-pppext-pptp-02.txt).
Microsoft Callback Control Protocol (CBCP)
BACP/BAP (RFC 2125)
LCP Extension Protocol (for Callback functionality) (RFC 1570)
Telnet Com Port Control Option (RFC 2217)
Error Control and Data Compression
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ITU-T V.42
ITU-T V.42bis
MNP 2-5
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20
CHAPTER 1: INTRODUCTION
Modulation Schemes
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V.90 (backwards-compatible with all US Robotics 56K Standards)
ITU-T V.34+
ITU-T V.34
ITU-T V.32bis
ITU-T V.32
ITU-T V.22bis
ITU-T V.22
ITU-T V.23
Bell 212A
ITU-T V.21
Bell 103
Security
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PAP, CHAP and MS-CHAP support
Callback support for dial-in and dial-out calls
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Upgradeability
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Flash memory for field firmware updates
Firmware posted on 3Com’s Web site
Fully upgradeable to future 56K standards
Diagnostics
I
LED status display
Statistics display
I
Warranty
3Com Corporation Limited Lifetime Warranty (refer to the end of this User
Guide for details).
I
Support for Internet Applications
Support for applications that use the User Datagram Protocol (UDP) and the
Transmission Control Protocol (TCP). The UDP protocol is used primarily by Internet
games.
Look for the latest list of Internet applications and games that are interoperable
with the LAN Modem at
http://www.3com.com/support/docs/lanmodem/.
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DUAL 56K LAN MODEM
FUNCTIONALITY DESCRIPTION
2
This chapter explains the Dual 56K LAN Modem’s key functionality for users who
wish to gain a fuller understanding of the LAN Modem before attempting to
install and configure the unit. The following topics are covered:
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LAN Side Connectivity:
Installing an Ethernet
Hub
On the Local Area Network (LAN) side of the Dual 56K LAN Modem, you can
connect up to four computers and/or printers directly to the unit’s built-in Ethernet
hub. This allows you to create a LAN and enable file-, application-, and
printer-sharing among the attached devices. By connecting an external hub (not
included) to one of the four LAN ports, you can increase the number of users to a
MODEM
CD RD
1
MODEM
CD RD
2
LAN Status
Message
Power
AA
SD
OH
AA
SD
OH
TX
COLL
1
2
3
4
OfficeConnect Dual 56k LAN Modem
Alert
OfficeConnect¤
Dual 56K LAN Modem
Port Status
Network Utilization
PWR PKTCOLL
1
2
3
4
5
6
7
8
=
COAX 1% 2% 3% 6% 12%25%50%80%
partition
Alert
green
=
link OK, off
=
link fail, yellow
OfficeConnect¤
Ethernet Hub 8
Figure 7 Dual 56K LAN Modem Ten Workstation Connection Example.
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22
CHAPTER 2: DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION
Wan Side: The Two
56K Modems
On the Wide Area Network (WAN) side of the Dual 56K LAN Modem, up to 25
users can share access to the WAN through use of the LAN Modem’s two internal
56K modems. When you configure the Dual 56K LAN Modem, you can choose
one of two ways to use two analog lines:
I
Two separate connections to different locations (one per analog line, or
“channel”)
I
One high-speed connection at a time, using Multilink Point-to-Point Protocol
(Multilink PPP) to combine the two analog channels into one.
Once a WAN connection is established, up to 25 users can share the open
connection and access the same location simultaneously.
Using the Modem
Channels
When you use the Dual 56K LAN Modem for its most common WAN application,
dial-out remote access, you can configure up to four remote destination profiles,
referred to as Service Providers. For each Service Provider that you configure,
you can choose whether to set up the connection as a single analog “channel”
connection, or as a Multilink-enabled connection.
If two or more Service Providers are set up in the LAN Modem, each as a single
channel connection, the following typical dial-out scenario becomes possible, as
Greg’s PC
Internet
Greg
Peter
Marsha’s PC
Peter’s PC
Jan’s PC
Public telephone
network
MODEM
CD RD
1
MODEM
CD RD
2
LAN Status
Message
Power
AA
SD
OH
AA
SD
OH
TX
COLL
1
2
3
4
OfficeConnect Dual 56k LAN Modem
Alert
¤
OfficeConnect
Dual 56K LAN Modem
Two analog lines
e
Hear
t
E
d
t
t
F
r
o
m
t
e
f
g
e
e
Ne
3
C
om
Remote Private
Network
Figure 8 Two Simultaneous Dial-out Connections to Two Different Remote Locations
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Using the Modem Channels
23
If one or more Service Providers are configured as a Multilink-enabled connection,
one high-speed call at a time is possible whenever one of these calls is in session,
Eric’s PC
OfficeConnect¤
r
c
o
n
ected
M
o
3
Co
m
Dual 56K LAN Modem
Public telephone
network
MODEM
CD RD
1
MODEM
CD RD
2
LAN Status
Message
AA
SD
OH
AA
SD
OH
TX
COLL
1
2
3
4
OfficeConnect Dual 56k LAN Modem
Alert
Power
Anne’s PC
Suhlle’s PC
L
3
o
CONSO
STACK
N
0
0
A
c
c
e
s
s
S
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5
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m
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W
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K
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ANALO
SLOT
G
1
4
3
1
1
2
Combining both
Private
network
analog lines with Multilink
provides a single high-speed
connection
Floyd’s PC
Figure 9 One High-Speed Connection to a Single Location
Sharing an Already In either of the above scenarios, once the dial-out connection is established, up to
Established Connection 25 users can share the already-open connection. The LAN Modem is designed to
make use of already-established call connections in order to provide optimal line
availability for all users sharing WAN access.
Whenever the LAN Modem receives an information packet requesting WAN
access, it looks for an already-established connection to the specified destination
(such as an ISP for an Internet connection). If an open connection is available, the
LAN Modem uses this for any authorized user. The LAN Modem uses the IP
address translation system, Network Address Translation (NAT), to allow multiple
users to transmit their individual information packets along this same open
channel. If you choose, you can restrict line sharing so that only authorized users
have access to an open connection to a specified destination.
Note that speed may be affected when multiple users share a connection and
attempt to download data simultaneously.
For a further explanation of NAT and IP address translation in the LAN Modem, see
Callback Capability When you configure a Service Provider profile to a remote destination, you can
choose to enable Callback in the LAN Modem. With Callback enabled, your
outgoing call is immediately dropped by the receiving device and then returned,
provided the call-receiving device is also set up with this feature. Callback can
provide potential cost savings for the dial-out party, as well as security for the
call-receiving device and its attached network.
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24
CHAPTER 2: DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION
Dial-out Call Routing When the LAN Modem makes an outgoing call, it follows a specific order for
routing data packets, based on the destination Network ID (that is, the IP address
and subnet mask) associated with the packet. If you plan to configure more than
one Service Provider in the LAN Modem, and in particular if you are configuring
both an Internet Service Provider and a Private Network Service Provider that
includes Internet access, you may want to understand how routing order is
determined in the LAN Modem.
When the LAN Modem receives a packet requesting WAN access, it looks first to
see whether the Network ID of the packet matches the Network ID of a
configured Private Network. If the Network ID of the packet matches the Network
ID of the Private Network, then the call is placed to the Private Network; if it does
not match the Network ID of the Private Network, then the call is routed to the
first configured ISP connection.
IP Address Translation When the Dual 56K LAN Modem is configured for any type of dial-out access, by
Using NAT default the IP address translation system, Network Address Translation (NAT),
is used to enable IP address sharing among the attached workstations.
NAT works by taking the local, private (i.e., not “publicly-routable”) IP addresses
of individual workstations attached to the LAN and translating them into a single,
publicly-routable IP address assigned by the remote location and used specifically
for communication across the WAN. Unlike a publicly-routable IP address, a local
IP address cannot be used for communication across the WAN and is functional
only within the boundaries of the LAN.
By translating the local IP addresses of each workstation in this way, the LAN
Modem can send out all packets destined for the same remote location over an
already-established connection. The LAN Modem in effect “masquerades” as a
single user in its communication with the remote, call-receiving device.
The following example shows IP address translation as it occurs in the LAN Modem
when three users share a single connection to the Internet.
Jack’s PC
192.168.1.2
LAN Modem
translates local
IP addresses to
ISP-assigned
IP address
Internet
ISP-assigned
IP address
Chrissy’s PC
192.168.1.3
Analog POTS line
Public telephone
network
204.71.201.75
MODEM
CD RD
1
MODEM
CD RD
2
LAN Status
Message
Power
AA
SD
OH
AA
SD
OH
TX
COLL
1
2
3
4
OfficeConnect Dual 56k LAN Modem
Alert
Larry’s PC
192.168.1.4
OfficeConnect
Dual 56K LAN Modem
192.168.1.1
Analog POTS line
Janet’s PC
192.168.1.5
Figure 10 Network Address Translation in a Dial-out Connection to the Internet
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Dial-in Functionality
25
Dial-in Functionality
When you set up the LAN Modem for dial-in support, you can configure up to ten
designated Dial-in Users to dial in to the local LAN. In addition, you must
configure Dial-in Global Parameters which apply to all dial-in calls.
When you configure Dial-in Global Parameters, you choose whether to allow one
or both channels to be used for dial-in calls. In addition, you choose whether to
set up all dial-in connections as single channel calls or Multilink-
enabled calls, and you also set the number of rings before the LAN Modem
answers the incoming data call. Depending upon your choice, the following
typical calling scenarios become possible:
Simultaneous Dial-in If you configure the LAN Modem to make only one channel available for dial-in
and Dial-out Calls calls, you can have one dial-in and one dial out call occurring simultaneously, as
Small Office LAN
2
9
d
C
M
N
A
L
N
D
S
4
S
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S
N
A
1
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T
2
B
1
B
N
K
O
E
W
O
P
T
R
E
L
A
Server
Telecommuter
Public telephone
network
MODEM
CD RD
1
MODEM
CD RD
2
LAN Status
Message
Power
AA
SD
OH
AA
SD
OH
TX
COLL
1
2
3
4
OfficeConnect Dual 56k LAN Modem
Alert
OfficeConnect¤
Dual 56K LAN Modem
Two analog lines
Internet
Figure 11 Simultaneous Dial-in and Dial-out Connections
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26
CHAPTER 2: DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION
Simultaneous Dial-in If you configure the LAN Modem to make both channels available for dial-in calls,
Calls from Two Different each as a single channel connection, you can have simultaneous dial-in calls from
Small Office LAN
Server
2 9
8
e d o
3
C
M
N
A
L
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D
S
S
3
T
A
4
T
S
N
A
2
1
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X
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2
B
1
B
N
K
O
E
W
O
P
T
R
E
L
A
Telecommuter
MODEM
CD RD
1
MODEM
CD RD
2
LAN Status
Message
Power
Public telephone
network
AA
SD
OH
AA
SD
OH
TX
COLL
1
2
3
4
OfficeConnect Dual 56k LAN Modem
Alert
OfficeConnect¤
Dual 56K LAN Modem
Two analog lines
Business traveler
Figure 12 Simultaneous Dial-in Connections from Two Different Remote Locations
High-speed Dial-in Call If you configure the LAN Modem to make both channels available as a single,
from One Location Multilink connection for dial-in calls, then one high-speed dial-in call at a time is
Small Office LAN
Server
MODEM
CD RD
1
MODEM
CD RD
2
LAN Status
Message
Power
Public telephone
network
AA
SD
OH
AA
SD
OH
TX
COLL
1
2
3
4
OfficeConnect Dual 56k LAN Modem
Alert
OfficeConnect¤
Dual 56K LAN Modem
Second small
office site
Combining both
analog lines with Multilink
provides a single high-speed
connection
Figure 13 One High-Speed Dial-in Connection from a Single Location
Line Sharing with Dial-in With dial-in calls to the LAN Modem, whenever an open channel is created by an
Calls incoming call via the LAN Site-to-Site dial-in scenario, the LAN Modem is designed
to make use of the already-open connection by returning any data packets to the
dial-in user on the open connection. This leaves the second analog channel free
for use, provided you have not set the LAN Modem to combine its two lines using
Multilink PPP. Without this line sharing feature, a separate, outgoing call would be
launched on the second channel during data transfers.
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Understanding Multilink PPP and Other Line Usage Options
27
Callback Capability with When you configure the LAN Modem for dial-in support, you can choose to
Dial-in Calls enable Callback in each Dial-User profile that you create. When Callback is
enabled, the LAN Modem is designed to identify the authorized Dial-in User, drop
the incoming call, and immediately place a return call to that user. This provides
security for the network attached to the LAN Modem, as well as potential cost
savings for the Dial-in User.
In order for dial-in Callback to work, the calling device at the other end must also
be set up with a Callback feature.
Understanding
Multilink PPP and
Other Line Usage
Options
When the Dual 56K LAN Modem’s two analog lines are used independently, each
uses the PPP (Point-to-Point Protocol), which is commonly used for the
establishment of dial-up connections, such as to the Internet. In some
configurations of the Dual 56K LAN Modem, you will encounter the following
protocols, used in connection with PPP.
Multilink Point-to-Point Multilink PPP is a protocol which allows two or more PPP connections to be
Protocol (MLPPP) combined to form a single, high-bandwidth connection or channel. In the case of
the Dual 56K LAN Modem’s two 56K lines, Multilink PPP is used to combine these
two 56K connections into a virtual, single 112K connection.
BACP/BAP In conjunction with Multilink PPP, the protocol pair BACP/BAP (Bandwidth
Allocation Control Protocol and Bandwidth Allocation Protocol) are used to
negotiate the addition and removal of the second modem connection with the
receiving device, based on a user-defined threshold. The advantage of BACP/BAP
is that it provides a higher probability of establishing a Multilink PPP call by
providing a specific telephone number for the second modem to call during high
traffic conditions.
Dynamic Bandwidth Dynamic Bandwidth Allocation (DBA) is another protocol used in conjunction with
Allocation (DBA) Multilink PPP to maximize efficiency of line usage. With Dynamic Bandwidth
Allocation enabled, if a Multilink call is in progress, the LAN Modem can
automatically and temporarily remove one of the channels from the call and use it
to place a data call to another service provider without disturbing the original call.
The only effect on the original call is that speed is temporarily reduced from
Multilink PPP to one analog channel. Once the second outgoing data call ends,
that channel is then returned to the Multilink PPP call, assuming that “Add Second
Channel As Required” has been configured for that service provider. Although
throughput is reduced while the second call is active, the reliability of the Multilink
PPP call is maintained.
Multilink PPP If you enable Multilink PPP when you configure the Dual 56K LAN Modem, you
Configuration Options will be able to choose from among the following Multilink PPP options:
I
Use One Channel
When this option is configured, only one modem channel is used when
connecting to a remote destination. In this case, Multilink PPP is disabled, and
neither DBA nor BACP/BAP is used.
I
Use Two Channels
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28
CHAPTER 2: DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION
When this option is configured, both modem channels are used every time a
connection is made to a remote destination, regardless of the amount of traffic
being generated. The DBA feature is not utilized, because both channels are
used for every call. Make sure that your remote destination supports this
functionality.
I
Add Second Channel As Required (recommended)
When this option is configured (referred to as bandwidth on demand), initially
one modem channel is used to connect to a remote destination, and the
second channel is automatically added when the amount of traffic on the first
channel reaches a threshold that you define. When you choose Add Second
Channel as Required, you enable both Multilink PPP and DBA. This is the
recommended setting for Multilink PPP.
In order for you to use Multilink PPP, the destination you are calling must also
support Multilink PPP. For example, if you are trying to dial out to the Internet,
your ISP must support Multilink PPP in order to successfully place a Multilink PPP
call. If you attempt to place a Multilink PPP call adding a “Second Channel as
Required” and the location you are calling does not support Multilink PPP, then a
single channel PPP connection is established. If you attempt to place a “Use Two
Channels” call and the location you are calling does not support this functionality,
a connection may not be established at all.
The Virtual FAX
Modem (Windows 95,
98, NT, and 2000)
The Dual 56K LAN Modem can be used with the Virtual FAX Modem application
(included on the OfficeConnect Dual 56K LAN Modem Companion Programs
CD-ROM), which enables Windows users on the LAN to access one or both of the
internal 56K modems as if they were directly connected to the user’s workstation
through an RS-232 serial (COM) port.
By installing the Virtual FAX Modem application onto individual workstations
connected to the LAN, users can run applications that call for a dedicated modem,
such as a fax application for sending Class 2.0 faxes (Class 1 or Class 2 faxes are
not supported) or connecting to Online services. Use of the two modems for
Virtual FAX calls can be monitored by a network administrator through the Dual
56K LAN Modem’s Manual Call Control page.
Although both modems can be used at the same time to create two Virtual FAX
Modem connections, each connection can support only one user at a time. In
other words, a Virtual FAX Modem connection cannot be shared.
For instructions on installing and using the Virtual FAX Modem, and for
information on monitoring Virtual FAX Modem calls through the Manual Call
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Support for Virtual Private Networks (VPNs)
29
Support for Virtual
Private Networks
(VPNs)
Through its support of the Point-to-Point Tunnel Protocol (PPTP), the Dual 56K
LAN Modem allows users on any workstation attached to the LAN Modem to
communicate with a remote private network over the Internet using a Virtual
Private Network (VPN) tunnel, provided the necessary client software is installed
on the user’s workstation.
Although the LAN Modem allows for the transparent passage of VPN tunnel data
from a computer on its LAN side to its WAN side, the LAN Modem cannot itself
initiate or terminate a tunnel. In other words, the LAN Modem does not encrypt or
encapsulate data on the outgoing side of the VPN connection, nor does it act as a
tunnel terminator to unpack tunnel packets on the incoming side.
VPN tunnels are a private, secure means by which content-sensitive data that uses
any routing protocol can be transported over the public, IP-routable-only Internet.
Because a VPN tunnel is established through a local call to an Internet Service
Provider, a user connecting to a remote Private Network through a VPN tunnel can
eliminate long distance charges that might otherwise be incurred from dialing
directly to the remote private network.
Figure 14 shows a VPN tunnel connection to a remote private network using a
single, locally-dialed ISP call.
VPN tunnel
M
o
r
c
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n
n
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c
et
d
3
C
o
m
Workstation
with PPTP
client software
Public telephone
Internet
MODEM
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1
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CD RD
2
LAN Status
Message
Powr
AA
SD
OH
AA
SD
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TX
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1
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OfficeConnect Dual 56k LAN Modem
Alert
3
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Dual 56K LAN Modem
PPTP Tunnel
server
Corporate office
LAN
Figure 14 VPN Tunnel Connection to a Remote Private Network via an ISP
To create a VPN tunnel from a workstation attached to the Dual 56K LAN Modem,
no special configuration of the LAN Modem is required. The client workstation
must, however, have the appropriate software, and a tunnel server must be set up
at the remote private network.
Basic instructions for setting up and initiating a VPN tunnel from a client
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30
CHAPTER 2: DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION
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BEFORE YOU BEGIN
3
This chapter explains how to set up your Dual 56K LAN Modem, and guides you
through the basic pre-installation checks that you should perform on all
workstations that you will attach to the LAN Modem. This includes checking each
workstations’ TCP/IP and IP address settings to determine whether it is set up for
dynamic or static IP networking. Instructions for setting up TCP/IP on your
workstation are provided for users who must perform this step.
Package Contents
Your Dual 56K LAN Modem package should contain all of the items shown:
OfficeConnect
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Contains:
• User Guide (PDF and HTML)
• Getting Started Guide (PDF)
• Adobe Acrobat Reader
• Web Browsers
Two analog
telephone cables
(RJ-11 to RJ-11)
Power supply
Network Assistant CD
transformer and
country-specific
power cord
Contains helpful networking
tutorials, troubleshooting
tips and product information
• EZ-LAN Wizard
• LAN Modem Desktop Manager
• Virtual FAX Modem/PhoneTools Fax Software
• Dial-Up Networking 1.3
Phone port adapter
(not provided for
all locations)
One 10BASE-T
Ethernet cable
(RJ-45 to RJ-45)
Before You Begin
In order to install and configure your Dual 56K LAN Modem, you should already
have the following:
I
I
I
One or two available Analog Telephone Connections, with available RJ-11
outlets
An Internet Service Provider (ISP) Account (unless you are only connecting
to a private network)
A Workstation that meets country-specific regulatory standards, with the
following requirements:
I
I
I
A 10BASE-T Ethernet card or Ethernet connectivity (Ethernet connectivity is
built in for Power Macintosh users)
TCP/IP software (built in with Windows 95, 98, NT, and 2000 and
Macintosh OS 7.6 or later)
CD-ROM drive
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32
CHAPTER 3: BEFORE YOU BEGIN
I
A Web Browser, such as Netscape Navigator (4.0 or later) or Microsoft
Internet Explorer (4.0 or later).
Your computer is used to configure the LAN Modem, in addition to being one of
its networked devices. You use the web browser installed on your computer to
access the LAN Modem’s internal configuration screens.
Why Check TCP/IP and
IP Address Settings?
The Dual 56K LAN Modem is an IP router designed for optimal use with networks
that use dynamic IP addressing. For most people using the LAN Modem for
shared Internet access, dynamic IP addressing is the type of addressing scheme
most often used by Internet Service Providers (ISPs). It is also the type of addressing
prevalent in many existing corporate networks.
Although the Dual 56K LAN Modem is not limited to use with dynamic IP
networks (some users may find that their ISP or the corporate network to which
they want to connect employ static IP addressing), the steps for installing and
configuring the Dual 56K LAN Modem will differ, depending on the type of
addressing your computer is set up to use.
If you already know that you will be dialing out to a network that uses static IP
addressing, or if you are setting up an advanced LAN Modem site-to-site network
and plan to use a static IP addressing scheme, refer to the instructions under
TCP/IP Settings Because the Dual 56K LAN Modem is an IP-only router, any computer attached to
the Dual 56K LAN Modem must also have TCP/IP installed for the LAN Modem to
communicate with the computer. For Windows 95, 98, NT, and 2000, and for
Macintosh OS 7.6 or later, TCP/IP is provided as part of your operating system.
However, if you are using Windows and have never made remote connections
from your computer, you may have to add TCP/IP to your computer’s protocol list
to “bind” it to your Ethernet adapter, even though the protocol is included with
the operating system. Instructions for doing this are provided under “Adding
Checking TCP/IP and IP
Address Settings
To check your TCP/IP settings and your dynamic vs. static IP address setup, follow
the instructions for your operating system. You should perform this check for each
computer that you plan to connect to the LAN Modem.
Windows 95, 98, NT, and Simply run the EZ-LAN Wizard, located on the OfficeConnect Dual 56K
2000: Companion Programs CD-ROM included with your LAN Modem package, on your
computer. EZ-LAN checks your PC’s settings and, if you choose, optimizes them for
use with the LAN Modem by making the following changes:
I
I
I
Sets your PC to obtain its IP address and subnet mask from the LAN Modem's
DHCP server.
Changes your PC’s default gateway settings, so that the LAN Modem is
configured as its default gateway.
Changes your PC’s DNS server settings, so that the LAN Modem is configured
as its DNS server.
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Checking TCP/IP and IP Address Settings
33
I
I
Sets applications which previously used a Dial-Up Networking connection to
use a LAN connection.
(Optional) Configures a statically-configured PC to access the LAN Modem’s
configuration screens, and, if you choose, changes the LAN Modem’s IP
address to communicate with a statically-configured PC.
Before using the EZ-LAN Wizard to optimize your settings, make sure you have
If the EZ-LAN Wizard discovers that TCP/IP is not bound to your Ethernet adapter,
set up TCP/IP.
Mac OS 7.6 or Later Simply perform the following check to see whether your computer is set up for
dynamic IP addressing (TCP/IP is automatically installed and set up in all Power
Macintoshes):
1 From the Apple menu, select Control Panels, and then TCP/IP.
Figure 15 TCP/IP Dialog Box for Macintosh Computers
2 In the Connect Via pop-up menu, select Ethernet (if iMac, select Ethernet built-in).
3 In the Configure pop-up menu, select Using DHCP Server. All other fields should
be blank or set to <will be supplied by server>.
4 Select File, and then Close to exit the TCP/IP Control Panel, saving any changes.
You may want to rename this configuration so that your previous configuration is
not overwritten.
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34
CHAPTER 3: BEFORE YOU BEGIN
Adding TCP/IP to Your
Protocols List
If you ran the EZ-LAN Wizard on your computer and found that TCP/IP was not
bound to your Ethernet adapter, follow the steps to add TCP/IP to your protocols
list, according to your operating system:
Windows 95 and 98 To add TCP/IP to your protocols list for Windows 95 or 98:
You may be prompted for your Windows 95 or 98 installation disks or CD-ROM.
1 From the Control Panel, double-click Network.
The Network dialog box appears.
Figure 16 Network Dialog Box
2 Click Add.
The Select Network Component Type dialog box appears.
Figure 17 Select Network Component Type Dialog Box
3 Select Protocol and then click Add.
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Adding TCP/IP to Your Protocols List
35
The Select Network Protocol dialog box appears.
Figure 18 Select Network Protocol Dialog Box
4 From the Manufacturers list box, select Microsoft, and then from the Network
Protocols list box, select TCP/IP.
5 Click OK to exit the Select Network Protocol Dialog box.
6 Click OK again to exit the Network Dialog box.
You may be prompted to re-boot your workstation.
7 Run the EZ-LAN Wizard again to optimize the settings on your workstation.
Windows NT 4.0 To add TCP/IP to your protocols list for Windows NT 4.0:
You may need your Windows NT 4.0 installation CD-ROM.
1 From the Control Panel, double-click Network.
The Network dialog box appears.
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36
CHAPTER 3: BEFORE YOU BEGIN
Figure 19 Windows NT Protocols Configuration Window
3 Click Add.
The Select Network Protocol window appears as shown in Figure 20.
Figure 20 Select Network Protocol Window
4 Select TCP/IP Protocol, and then click OK.
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Adding TCP/IP to Your Protocols List
37
The following message appears.
Figure 21 DHCP Message Box
5 Select Yes, unless you know that you will be setting up the LAN Modem for use on
a static network. By selecting Yes, you are setting up the LAN Modem to act as
your DHCP server.
If you will be connecting to a static network, select No.
You are prompted to copy files. You may be prompted to insert your CD ROM.
6 If the necessary files already exist on your hard drive, click Continue. Otherwise
insert the Windows NT 4.0 CD ROM and click Continue.
If you have Remote Access Service (RAS) installed on your PC, after the
appropriate files are copied to your PC, a message box asks whether or not you
would like TCP/IP installed for RAS. If you select Yes, you must select the device
you want to access remotely and then click Close.
7 After the appropriate files are copied to your PC, you will see TCP/IP Protocol listed
in the Network Protocols group box, as shown in Figure 22.
Figure 22 Network Protocols Window
8 Click Close.
The Microsoft TCP/IP Properties window appears, as shown in Figure 23.
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38
CHAPTER 3: BEFORE YOU BEGIN
Figure 23 Microsoft TCP/IP Properties Window
9 From the Adapter drop-down list box, select the Ethernet card that is connected to
the Dual 56K LAN Modem.
10 Select Obtain an IP Address from a DHCP Server, unless you are setting up for
static IP addressing. If this LAN uses static IP addresses, enter the IP address and
subnet mask.
11 Click OK.
12 Click Yes to restart your PC and allow the changes to take effect.
13 Run the EZ-LAN Wizard again to optimize the settings on your workstation.
Windows 2000 To add TCP/IP to your protocols list for Windows 2000:
You may be prompted for your Windows 2000 installation disks or CD-ROM.
1 From the Control Panel, double-click Network and Dial-up Connections.
2 Double click Local Area Connection.
The Local Area Connection Status window opens.
3 Click Properties.
The Local Area Connection Properties window opens.
4 Click Install.
5 Select Protocol and click Add.
The Select Network Component Type dialog box opens.
6 Select Internet Protocol (TCP/IP) and then click Add.
7 Click Close to exit the Local Area Connection Properties window.
8 Click Close again to exit the Local Area Connection Status window.
You may be prompted to re-boot your workstation.
9 Run the EZ-LAN Wizard again to optimize the settings on your workstation.
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Setting Up Your Computer If You Have a Static IP Address
39
Setting Up Your
Computer If You Have
a Static IP Address
If your computer has a static IP address and you want to keep this for use with a
network that uses or will use static IP addressing, you must make certain changes
to the LAN Modem’s default parameters. These changes will allow your
statically-configured PC to “talk” to the LAN Modem for its initial configuration.
The procedure is described in this section.
For Windows 95, 98, 2000 and NT 4.0, you can choose to use the EZ-LAN Wizard,
located on the Companion Programs CD-ROM to automatically set up your
statically-configured PC to access the LAN Modem. For other operating systems,
or to perform this procedure manually, follow the steps outlined in this section.
The LAN Modem is designed by default to work with a dynamically-assigned
network. The instructions in this section are for advanced users only.
By default, the LAN Modem is set up to establish itself automatically as the
“gateway” for computers on the LAN to access the WAN. However, if a computer
is set up for static instead of dynamic IP addressing, it will have a fixed IP address
assigned as its Gateway or Router entry that is not recognizable by the LAN
Modem. In this case, when you connect your computer to the LAN Modem and
turn on both for the first time, the LAN Modem will not be able to “talk” to your
workstation, and you will not be able to access the LAN Modem’s configuration
pages.
To communicate with the LAN Modem for its initial configuration, you need to
follow the procedure outlined below only for the workstation that you first
connect to LAN Modem.
The basic steps for setting up a statically configured workstation are outlined in
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40
CHAPTER 3: BEFORE YOU BEGIN
Record Workstation’s
Current Settings
Change Workstation
to Match LAN Modem
Launch Browser
Change LAN Modem
IP Address for Static LAN
Reset Workstation
to Original Static Settings
Figure 24 Set Up Steps for Statically Configured Workstation
Setup Steps for a Static The first step is to record your current, statically-configured workstation’s network
Workstation settings and set them aside for later use. Then you must temporarily change your
statically-configured workstation’s network settings so that your workstation can
communicate with the LAN Modem. The parameters which must be changed are
your workstation’s IP address, Subnet Mask and Gateway Address.
Follow the instructions for your operating system:
These instructions assume that the LAN Modem configuration is set to the factory
default. If you are moving the LAN Modem from a different LAN, reset the LAN
For Windows 95 and 98 Users
1 From the Start menu, select Settings and then Control Panel.
2 Double-click Network, and then select TCP/IP from the scroll-down list.
If you have multiple TCP/IP entries, select TCP/IP for the Ethernet card associated
with the Dual 56K LAN Modem.
3 Click Properties, and then click the Gateway tab. Write down the first IP address
listed under Installed gateways. You will reenter this information later.
4 Click the IP Address tab.
5 Write down the values listed in the IP Address and Subnet Mask fields. You will
need to reenter this information later.
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Setting Up Your Computer If You Have a Static IP Address
41
6 Change the IP address and subnet mask fields as follows (this allows your
workstation to be recognized by the LAN Modem):
I
In the IP Address field, enter 192.168.1.2
I
In the Subnet Mask field, enter 255.255.255.224
7 Click the Gateway tab.
8 Change the Gateway IP address to 192.168.1.1
9 Click OK to close the Network control panel.
You are asked to restart your computer.
10 Click OK.
Your workstation has now been set up to temporarily access the LAN Modem’s
initial configuration screens. You are ready to go on to Chapter 4, “Installing the
For Windows 2000 Users
1 From the Start menu, select Settings and then Control Panel.
2 Double-click Network and Dial-up Connections.
3 Double click Local Area Connection.
The Local Area Connection Status window opens.
4 Click Properties.
The Local Area Connection Properties window opens.
5 Select Internet Protocol (TCP/IP) and click Properties.
The Internet Protocol (TCP/IP) Properties window opens.
6 Write down the values listed in the IP Address, Subnet Mask and Default Gateway
fields. You will need to reenter this information later.
7 Change the IP address, subnet mask and Default Gateway fields as follows (this
allows your workstation to be recognized by the LAN Modem):
I
I
I
In the IP Address field, enter 192.168.1.2
In the Subnet Mask field, enter 255.255.255.224
In the Default Gateway field, enter 192.168.1.1
8 Click OK to close the Internet Protocol (TCP/IP) Properties window.
9 Click OK to exit the Local Area Connection Properties window.
10 Click Close to exit the Local Area Connection Status window.
You may be prompted to re-boot your workstation.
Your workstation has now been set up to temporarily access the LAN Modem’s
initial configuration screens. You are ready to go on to Chapter 4, “Installing the
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42
CHAPTER 3: BEFORE YOU BEGIN
For Windows NT 4.0 Users
1 From the Start menu, select Settings and then Control Panel.
2 Double-click Network, and then click the Protocols tab.
3 Highlight TCP/IP, and then click Properties.
4 Click the IP Address tab, and then select the Ethernet card associated with the
Dual 56K LAN Modem from the Adapter drop-down list box.
5 Write down the values listed in the IP Address, Subnet Mask and Default Gateway
fields. You will need to reenter this information later.
6 Change the IP address, subnet mask and Default Gateway fields as follows (this
allows your workstation to be recognized by the LAN Modem):
I
I
I
In the IP Address field, enter 192.168.1.2
In the Subnet Mask field, enter 255.255.255.224
In the Default Gateway field, enter 192.168.1.1
7 Click OK to close the Microsoft TCP/IP Properties dialog box.
8 Click OK to close the Network Control Panel box.
You are asked to restart your computer.
9 Click OK.
Your workstation has now been set up to temporarily access the LAN Modem’s
initial configuration screens. You are ready to go on to Chapter 4, “Installing the
For Macintosh Users
1 From the Apple menu, select Control Panels, and then TCP/IP.
You may want to duplicate your current configuration so that your previous
configuration is not overwritten.
2 In the Connect Via field, make sure Ethernet (if iMac, Ethernet built-in) is selected.
3 Look at the entry in the Configure field. It should be set to Manually if you are on
a static network.
4 Write down the values listed in the IP Address, Subnet Mask and Router Address
fields. You will need to reenter this information later.
5 Change the IP address, subnet mask and Default Gateway fields as follows (this
allows your workstation to be recognized by the LAN Modem):
I
I
I
In the IP Address field, enter 192.168.1.2
In the Subnet Mask field, enter 255.255.255.224
In the Router Address field, enter 192.168.1.1
6 Choose File, and then Close, saving any changes.
Your workstation has now been set up to temporarily access the LAN Modem’s
initial configuration screens. You are ready to go on to Chapter 4, “Installing the
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INSTALLING THE DUAL 56K LAN
MODEM
4
This chapter explains how to connect your computer to the Dual 56K LAN Modem
and install the cables in preparation for configuring the unit.
When you first set up the LAN Modem, you initially connect only one computer to
the unit. After you have finished configuring the LAN Modem from that computer
using a standard web browser, you can then begin to network additional
computers, hubs, and/or printers to the LAN Modem.
Before You Start the
Installation
Before you install the Dual 56K LAN Modem, have the following items ready.
I
I
Two analog (RJ-11 to RJ-11) telephone cables (provided).
One 10BASE-T Ethernet cable (RJ-45 to RJ-45). It is recommended that you use
the cable provided. If, however, you choose to use another cable, it must be a
straight-through, 10BASE-T Ethernet cable. A crossover cable cannot be used
to connect the LAN Modem to your computer.
I
Power adapter (you must use the power adapter provided in the package).
Installation Steps To install the Dual 56K LAN Modem:
1 Turn off your computer.
2 Connect your computer to any LAN port (if you are unsure, use Port 1), using the
Ethernet cable provided, as shown in Figure 25.
RJ-45
2
E
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P
2
E
IN
L
1
E
N
O
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P
2
4
1
E
IN
L
1
3
Ethernet
cable
LAN
RJ-45
Figure 25 Ethernet Cable Connection
3 Connect the two analog cables to the ports labeled LINE 1 and LINE 2 on the Dual
56K LAN Modem’s back panel, and insert the opposite ends into two available
If you are only using one line, use the LINE 1port.
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44
CHAPTER 4: INSTALLING THE DUAL 56K LAN MODEM
RJ-11
2
E
N
O
H
P
RJ-11
2
E
IN
L
1
E
N
O
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P
2
4
1
RJ-11
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IN
L
1
Analog
telephone cables
3
LAN
RJ-11
Figure 26 Analog Cable Connections
You may need to use a country-specific phone adapter (optional).
Installing Analog You can connect up to two analog devices, such as a touch-tone telephone,
Equipment answering machine, or fax machine, to the Dual 56K LAN Modem’s two
pass-through PHONE ports.
You will need RJ-11 to RJ-11 cables that came with the analog devices for your
analog phone port connections. In some cases, you may also need a
country-specific adapter.
To install the analog devices:
4 Connect the analog device or devices to the ports labeled PHONE 1 and PHONE 2
on the back of the Dual 56K LAN Modem and to your analog equipment, as
LINE
2
2
4
LINE
1
1
3
LAN
Figure 27 Analog Equipment Connection
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Before You Start the Installation
45
P
RESET
10-18 VDC
8A MAX
5
¥
0
6
Figure 28 Power Cable Connection
6 Plug the other end of the power module into a surge-protected, standard wall
outlet, and watch for the following front panel LED signals:
I
The PWR and AA indicator LEDs light up.
I
The ALERT LED flashes momentarily as the unit undergoes a power-up, self-test
diagnostic.
I
After the diagnostic test has been completed, only the PWR LED remains lit.
7 Turn on your workstation.
Watch for the LAN Status LED to flash and then remain lit.
m
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This completes the Dual 56K LAN Modem installation. You are ready to go on to
you wish to configure the LAN Modem for shared dial-out access to a Private
the LAN Modem for dial-in support, refer to Chapter 8.
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46
CHAPTER 4: INSTALLING THE DUAL 56K LAN MODEM
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CONFIGURING THE DUAL 56K LAN
MODEM FOR INTERNET ACCESS
5
This chapter explains how to configure the Dual 56K LAN Modem for the most
common application — shared Internet access. If you followed the instructions
provided in the Getting Started Guide, you have already configured the LAN
Modem for shared Internet access. For more advanced applications, including
connecting to a remote Private Network, configuring advanced parameters, or
configuring the LAN Modem for dial-in support, refer to Chapters 6, 7, and 8,
respectively.
The configuration windows shown in this chapter may differ slightly from what is
displayed on your computer.
Typical Configuration
The typical configuration covers the following main steps.
Launch
Web Browser
Select Country &
Telephone Numbers
Run
ISP Wizard
Verify
Configuration
Figure 29 Main Steps for Typical Configuration
Before You Start the Before you configure the Dual 56K LAN Modem, you should already have done
Configuration the following:
I
Run the EZ-LAN Wizard or performed the TCP/IP and IP Address check, as
I
Installed the hardware, as described in Chapter 4.
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48
CHAPTER 5: CONFIGURING THE DUAL 56K LAN MODEM FOR INTERNET ACCESS
In addition, you should have the following information ready as you go through
the configuration:
I
I
I
I
Your Analog Telephone Number or Numbers
ISP Telephone Number
ISP User ID and Password
ISP DNS Address (required only if your ISP does not use dynamic IP
addressing)
I
(Optional) Call Waiting Disable Command (your telephone company can
provide you with this value)
Configuration Steps The following steps guide you through configuration of the Dual 56K LAN Modem
for shared Internet access.
was set up for static IP addressing, and you chose to follow the manual setup
procedure for Static IP addressing, (as opposed to using the EZ-LAN Wizard, as
initial configuration steps.
1 Launch the Web browser on the computer that you attached to the LAN Modem
during the installation.
Regardless of the start page to which your Web browser is set, your Web browser
will go to the Dual 56K LAN Modem’s initial configuration welcome window.
Figure 30 Initial Configuration Welcome Window
2 Click the Continue link.
A message box appears indicating that the LAN Modem clock is being
synchronized to the date and time on your computer.
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Typical Configuration
49
The Set Password window appears. This password is used to guard access to the
Dual 56K LAN Modem’s configuration program. If you would like to restrict access
to the configuration settings, select a password and record it in a safe place.
Figure 31 Set Password Window
3 Enter a password in the Password field and then enter the same password in the
Password (repeat) field to confirm it. If you do not wish to enter a password, leave
the fields empty.
By entering a password, you restrict access to the LAN Modem’s configuration
screens. This password locks automatically after five minutes of inactivity.
4 Click Submit.
A message box indicates that your password has been set.
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50
CHAPTER 5: CONFIGURING THE DUAL 56K LAN MODEM FOR INTERNET ACCESS
Figure 32 Set Country and Telephone Numbers Screen
5 Choose your country from the drop-down list.
6 Enter your analog telephone number(s) including area code. This allows you to
take advantage of BAP/BACP to add and remove channels as bandwidth
demands.
7 Click Continue.
If you chose any country other than the United States, the LAN Modem resets and
then returns you to the initial Welcome screen. Continue from Step 2, above.
The ISP Wizard appears.
If you do not want to use the ISP Wizard, preferring instead to set up a connection
to a Private Network, click Abort to reach the Dual 56K LAN Modem Main
the ISP Wizard is a helpful step towards confirming the proper operation of your
LAN Modem.
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Typical Configuration
51
Figure 33 ISP Wizard Window
8 In the ISP Name field, choose any name that you wish to associate with your ISP.
9 In the Dial Out Prefix field, enter the number required to access an outside line. An
example would be dialing “9” for use with a PBX. If not required, leave this field
blank.
10 (Optional) In the Call Waiting Disable Command field, enter the value you
obtained from your telephone company for disabling Call Waiting.
If you have Call Waiting enabled on your line and you do not disable Call Waiting,
then incoming calls to that line may disrupt data calls.
11 In the Telephone Number field, enter the telephone number of your ISP.
If you want to enter a second telephone number to connect to your ISP, refer to
typical installation procedure.
12 In the User ID and Password fields, enter your User ID and Password for your ISP
account.
13 If your ISP requires a DNS address, enter it in the DNS Address field. If you are not
sure, leave this field blank.
14 Click Continue.
A call is launched to your ISP, and the TX LED on the front panel of the LAN
Modem flashes, indicating data transmission from the LAN Modem across the
WAN. A congratulations message appears.
A successful connection to the Internet verifies the successful configuration of
your Dual 56K LAN Modem and your ISP connection. If the connection to your ISP
15 Click Continue.
This completes the configuration and takes you directly to the World Wide Web
and 3Com’s LAN Modem Support web site.
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52
CHAPTER 5: CONFIGURING THE DUAL 56K LAN MODEM FOR INTERNET ACCESS
The LAN Modem Support Web Site
From the LAN Modem Support web site, you can register your Dual 56K LAN
Modem, read any new and up-to-date information about your product, and
perform firmware upgrades to the LAN Modem as they become available.
To access this LAN Modem Support web site at any time, go to:
The call to your ISP established via the ISP Wizard will automatically disconnect
after seven minutes of inactivity. (This is a default value and can be changed. Refer
the LAN Modem IP Address for Static IP Users” below. If you experience any other
You can now connect up to three more computers and/or printers directly to your
new LAN. To add more than four users using an external hub, refer to
Changing the LAN
Modem IP Address for
Static IP Users
Static IP Users”, and chose to follow the manual setup procedure for static IP
addressing (as opposed to using the EZ-LAN Wizard, as described in the Getting
Started Guide), you must now change the LAN Modem’s default IP address to
recognize your statically configured workstation. The following steps explain how
this is done.
1 Access the LAN Modem’s main page by entering the following URL in your Web
browser: http://3com.oc.lanmodem. Alternatively, you can use the numeric
form of this same IP address: http://192.168.1.1.
2 From the Dual 56K LAN Modem’s main configuration page, click the LAN
Parameters icon.
The LAN (Ethernet) Parameters page appears.
3 In the IP Address field, enter your workstation’s original Gateway IP address that
4 Click Submit.
The Dual 56K LAN Modem resets itself.
5 Quit your Web browser.
6 Reset your workstation back to the original network settings you recorded in
7 Restart your workstation.
This completes the setup procedure for using a statically configured workstation
with the LAN Modem.
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The LAN Modem Main Configuration Page
53
Setting Up Additional Now that you have finished configuring your Dual 56K LAN Modem, you can set
Service Provider Profiles up a total of four additional Service Provider profiles. The LAN Modem defines
any remote dial-out destination (including the ISP profile you just configured) as a
Service Provider. The LAN Modem recognizes two categories of Service
Providers:
I
Internet Service Providers (ISPs), for connection to the Internet (such as that
created by the ISP Wizard).
If you have another Internet Service Provider account and would like to
configure a second Internet Service Provider profile, refer to Chapter 7,
“Configuring Additional Service Providers.” You will see the name of the ISP
that you just configured listed in the Service Provider profile list.
I
Private Network Service Providers, for connection to a remote Private
Network, such as a corporate office LAN (this can include indirect access to the
Internet through the corporate LAN’s Internet connection).
If you would like to set up a connection to a remote Private Network, refer to
Configuring Additional The configuration you just performed guided you through the basic parameters
LAN Modem Parameters that were needed to connect you to your ISP. There are additional parameters for
this ISP connection which were automatically set to default values during the
configuration which you change or adjust. These parameters include Domain
Name, Compression, NAT, and WAN Link IP Address, as well as an alternate or
Multilink ISP telephone number with which your ISP may have provided you. For
information on these parameters and changing their default values, refer to
The LAN Modem Main
Configuration Page
Now that you have performed the initial configuration of the LAN Modem, any
further configuration of the unit — adding additional Service Providers,
configuring advanced parameters, or changing current parameters — is handled
through the Dual 56K LAN Modem’s Main Configuration Page, also called the
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CHAPTER 5: CONFIGURING THE DUAL 56K LAN MODEM FOR INTERNET ACCESS
Figure 34 Dual 56K LAN Modem Main Configuration Home Page
Even though the Main Configuration Page and its associated links are viewed
within your web browser, you are looking at screens which reside inside the LAN
Modem firmware, rather than on the World Wide Web.
The Main Configuration Page provides links to configuration, dialing, statistics
pages, and online help. There are links from the illustration icons, from the
buttons on the left-hand side of the page, and from the text links below the
illustration. For each configuration screen, context-sensitive online help is available
in the frame below the main screen.
You may want to familiarize yourself with the Main Configuration Page and its
various options. A basic description is provided here.
Links From the The links from the illustration icons will take you to the following pages:
Illustration
I
Service Providers: Takes you to the Service Providers page, where you can
configure connections to an additional ISP or to a remote Private Network, and
specify V.90 modem settings.
I
Workstations: Takes you to the Workstation Parameters page, where you can
change the associations between specific workstations attached to the LAN
Modem and authenticated service providers, as well as view IP address
information for each workstation.
I
I
LAN Parameters: Takes you to the LAN Parameters page, where you can
configure Ethernet parameters for your LAN Modem.
Data Call Parameters: Takes you to the Data Call Parameters page, where you
can change settings for Multilink calls and set inactivity timers to allow calls to
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The LAN Modem Main Configuration Page
55
be disconnected because of network inactivity, keeping telephone usage and
Internet access costs down.
I
Current Call Status: Takes you to the Current Call Information page, where
you can view information on an active call or calls.
Links from the Buttons
I
I
Home: Takes you back to the Main Configuration Home Page.
ISP Wizard: Allows you to configure an ISP profile using the ISP Wizard. Note
that if you already configured an ISP using the ISP Wizard, invoking the ISP
Wizard again will create a new profile and overwrite any previous settings. If
you would like to add a second ISP profile, use the Service Providers icon to
access the Service Providers configuration page.
I
I
Manual Calling: Takes you to the Manual Calling page, where you can
manually place and disconnect calls.
Statistics: Brings up a secondary set of buttons, through which you can view
statistics on System, Current Call, Last Call, Last 10 Calls, and Service
Providers.
I
I
Dial-in: Brings up a secondary set of Dial-in Configuration buttons, through
which you can access the Dial-in Wizard, Dial-in Global, and Dial-in Users
profiles for configuring dial-in support in the LAN Modem.
Advanced: Brings up a secondary set of buttons, through which you can
access the Local DNS Table, Upgrade Check, and Maintenance pages. From
the Maintenance page, you can reset the Dual 56K LAN Modem and set it up
for downloading the latest firmware.
I
Password: Takes you to the Password page, where you can change or set the
password for access to the LAN Modem, as well as lock the LAN Modem’s
parameter settings.
To access the Main Configuration Home Page at any time, simply enter the name
or numeric value of the LAN Modem’s IP address in your web browser, as follows:
http://lanmodem
or
http://3com.oc.lanmodem
or
http://192.168.1.1
You may wish to bookmark this page for easy future access.
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CHAPTER 5: CONFIGURING THE DUAL 56K LAN MODEM FOR INTERNET ACCESS
Connecting an
External Hub to the
Dual 56K LAN Modem
Once you have finished configuring the Dual 56K LAN Modem, you can connect
up to three additional computers, or a combination of an external Ethernet hub
and computers to increase the number of users for WAN access to 25.
Figure 35 shows the more common scenario of an additional 8-port hub for a
10-user, shared WAN connection.
MODEM
CD RD
1
MODEM
CD RD
2
LAN Status
Message
Power
AA
SD
OH
AA
SD
OH
TX
COLL
1
2
3
4
OfficeConnect Dual 56k LAN Modem
Alert
OfficeConnect¤
Dual 56K LAN Modem
Port Status
Network Utilization
PWR PKTCOLL
1
2
3
4
5
6
7
8
=
COAX 1% 2% 3% 6% 12%25%50%80%
partition
Alert
green
=
link OK, off
=
link fail, yellow
OfficeConnect¤
Ethernet Hub 8
Figure 35 10-User Shared WAN Connection Using an 8-Port Ethernet Hub
Before You Begin To create a shared WAN connection for more than four users on the Dual 56K LAN
Modem, you will need the following:
I
I
I
A 10BASE-T Ethernet hub, such as the OfficeConnect Ethernet Hub 8
A 10BASE-T Ethernet cable (two RJ-45 to RJ-45 connector ends, not provided)
A 10BASE-T Ethernet cable for each additional workstation
If the hub you are using does not have an MDI/MDIX switch, you will have to use a
crossover cable.
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Connecting an External Hub to the Dual 56K LAN Modem
57
To connect the hub to the Dual 56K LAN Modem:
1 Insert one end of the Ethernet cable into any available LAN port on the back of the
OfficeConnect
Ethernet Hub 8
2
OfficeConnect
Dual 56K LAN Modem
2
E
N
O
H
8
7
6
5
4
3
2
L
1
P
2
E
IN
IX
D
1
DI/M
E
N
M
O
H
P
2
1
E
IN
L
4
1
3
10-18 VDC
8A MAX
¥
0
1
RESET
Ethernet cable
10-30 VDC
8A MAX
¥
0
3
Figure 36 10BASE-T Hub-to-LAN Modem Connection
2 Insert the opposite end of the cable into one of the ports on the external Ethernet
hub.
3 If you are using an OfficeConnect Ethernet Hub 8, insert the opposite end of the
Ethernet cable into port 8, and then set the MDI/MDIX switch to MDI (that is,
pressed in). Make sure that the LED associated with that Ethernet port is lit. If it is
not, try changing the MDI/MDIX switch setting.
You can now connect any additional computers and/or printers to the remaining
LAN ports.
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CHAPTER 5: CONFIGURING THE DUAL 56K LAN MODEM FOR INTERNET ACCESS
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CONFIGURING THE DUAL 56K LAN
MODEM FOR PRIVATE NETWORK
ACCESS
6
This chapter explains how to configure the Dual 56K LAN Modem for shared
access to a private network, such as a remote corporate office LAN. This includes
the option of connecting to the Internet through your private network, if your
private network allows you this option.
For instructions on configuring advanced parameters, or configuring the LAN
The configuration windows shown in this chapter may differ slightly from what is
displayed on your computer.
Before You Start the
Configuration
Before you configure the Dual 56K LAN Modem for shared private network
access, you should already have completed the following steps:
I
Run the EZ-LAN tool or performed the TCP/IP and IP Address check on your
I
Installed the hardware, as described in Chapter 4.
In addition, you will have to obtain the following information from the network
administrator at your private network:
I
I
I
Telephone number(s) you must dial to access this private network
User ID and password you must dial to access this private network
IP Address and Subnet mask of your private network
Depending on the setup of your private network, you may also need the following
information (check with your network administrator):
I
WAN Link IP Address (necessary if the private network to which you are
connecting requires a static IP address and subnet mask)
I
I
I
Domain Name for the private network
DNS IP address(es)
(Optional) Call Waiting Disable Command (your telephone company can
provide you with this value)
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60
CHAPTER 6: CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK ACCESS
Configuration Steps
The following steps guide you through configuration of the Dual 56K LAN Modem
for shared access to a remote private network.
initial configuration steps.
1 Launch the Web browser on the computer that you connected to the LAN Modem
during the installation.
If you are setting up the LAN Modem for the first time, your Web browser will go
to the Dual 56K LAN Modem’s initial configuration welcome window, regardless
of the start page to which your Web browser is set.
If you have already set up the LAN Modem for its initial configuration, access the
LAN Modem Main Page by entering http://3com.oc.lanmodem in the location bar
Figure 37 Initial Configuration Welcome Window
2 Click Continue.
A message box appears, indicating that the LAN Modem clock is being
synchronized to the date and time on your computer.
The Set Password window appears. This password is used to guard access to the
Dual 56K LAN Modem’s configuration program. If you would like to restrict access
to the configuration settings, create a password and record it in a safe place.
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Configuration Steps
61
Figure 38 Set Password Window
3 (Optional) Enter a Password in the Password field, and enter it again in the
Password (repeat) field to confirm it.
If do not wish to enter a Password, leave the fields empty.
4 Click Submit.
A message box indicates that your password has been set.
Figure 39 Set Country and Telephone Numbers Screen
5 Choose your country from the drop-down list.
6 Enter your analog telephone number(s) including area code and click Continue.
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62
CHAPTER 6: CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK ACCESS
The ISP Wizard appears.
7 Click Abort to bypass the ISP Wizard and go directly to the LAN Modem’s Main
Configuration Page, also called the WebWizard.
Figure 40 Dual 56K LAN Modem Main Configuration Home Page
8 From the Main Configuration Home Page, click the Service Providers icon.
The Service Provider Selection window appears, as shown in Figure 41.
Service Provider is the general term used by the LAN Modem to define any type
of remote dial-out destination. For purposes of routing traffic, the LAN Modem
recognizes two categories of Service Providers: Internet Service Providers, for
direct connection to the Internet, and Private Network (Service Providers), for
direct connection to a remote private network. If you configured the LAN Modem
for shared Internet access before beginning this configuration, then you have
already created one Service Provider profile. You can configure up to four Service
Provider profiles.
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64
CHAPTER 6: CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK ACCESS
Figure 42 Private Network Parameters Window
10 In the Name field, enter a name for this remote destination, such as the location of
the remote office.
11 In the Dial Out Prefix field, enter the number required by your location to reach an
outside line, if necessary. An example would be dialing “9” for use with a PBX. If
not required, leave this field blank.
12 (Optional) In the Call Waiting Disable Command field, enter the value you
obtained from your telephone company for disabling Call Waiting.
If you have Call Waiting enabled on your line and you do not disable Call Waiting,
then incoming calls may disrupt your modem connection.
The Dial Out Prefix and Call Waiting Disable Command will automatically be
applied to both telephone numbers that you enter below (if you have more than
one number). If you wish to set up one telephone number that does not require a
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Configuration Steps
65
dial out prefix, leave the Dial Out Prefix field blank and enter that prefix value as
part of the individual telephone number field itself (for example,
‘918005551000’).
13 In the Telephone Number 1 field, enter the telephone number that you obtained
from your Network Administrator for accessing this private network.
14 (Optional) If your private network has a second remote access number, enter it in the
designated field, and select Alternate or Multilink from the drop-down list (that is,
choose whether you want to dial this second number as an alternate number when
the first is unavailable, or whether you want to dial this number in addition to the first
to create a high-speed, Multilink (112K) connection.
15 Under Security, enter your User ID and Password for accessing this private network
(these may be case sensitive).
16 For DNS IP Address(es), enter the Primary DNS address of your private network in
the Primary field, if required (that is, your private network does not automatically
supply these addresses upon establishing a connection). If there is a Secondary
address, enter it in the Secondary field.
17 Under Bandwidth Allocation, choose whether to always use one channel when dialing
out to this private network, add the second channel as needed, or to always use both
channels.
18 Under Private Network Parameters, enter the IP Address, Subnet mask and, if
necessary, Domain Name of the private network.
The IP Address and Subnet mask fields are mandatory.
19 Under Callback Parameters, check Enable Callback if you wish to have your private
network’s remote access (receiving) device drop your call and immediately call you
back whenever you connect to the network; otherwise, leave this and the
remaining Callback fields at their defaults.
This function will only work properly if your remote private network supports
Callback functionality.
If you chose to enable Callback, make the following selections:
I
I
I
Callback Delay: Callback Delay is the amount of time the private network
will wait before calling back this LAN Modem. By default this is set to 5
seconds.
Callback Timeout: Callback Timeout is the amount of time that the LAN
Modem will wait (beyond the Callback Delay) for the private network to call
back. By default this is 90 seconds.
Callback Number: Enter your first analog telephone number (this is the
number to which the private network will place the Callback call). Note that
if a different Callback number has been specified on the server end, the
server callback number takes precedence.
I
Callback Username and Password: Enter the username and password of the
callback user. These values are used to verify the server’s authenticity to the
client. If the server is another LAN Modem, these fields should match the
login and password fields on the serve LAN Modem’s dial-in user
parameters. Note that callback authentication is optional.
20 Under Miscellaneous, make the following selections.
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CHAPTER 6: CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK ACCESS
21 Choose whether or not you want users on the LAN to be able to access the Internet
through your private network’s direct Internet connection, if your private network
allows you this option.
22 Choose whether or not you would like to use PPP Data Compression when
transferring data.
23 For Network Address Translation (NAT), your choice depends upon the IP
addressing scheme (dynamic or static) used by the private network into which you
will be dialing. Follow this rule of thumb:
I
I
If you performed the IP Address check in Chapter 3 and optimized your
computer for use with dynamic IP addressing or found that it was already
optimized, choose Yes to leave NAT enabled
If you performed the IP Address check and set up your computer for static IP
With NAT enabled, the LAN Modem makes translations between a single IP
address issued by the private network to the LAN Modem and individual IP
addresses of the computers on the LAN (assigned by the LAN Modem). This
translation allows multiple users on the LAN to access the private network by
appearing to be a single connection with a single IP address. To better understand
how NAT translation works, refer to the description of NAT in Appendix A,
24 In the WAN Link IP Address and Subnet mask fields, if the private network to
which you are connecting requires a static IP address and subnet mask, enter
those values here. Otherwise, leave these fields empty.
25 For Allow Automatic Call Initiation, leave the default setting which is Yes.
If you select No, you will have to manually launch a call to this service provider
every time you want to connect. You may want to change this field to No later on
if you find that calls are being connected unintentionally as a result of packets
generated by other computers on the LAN.
26 For Enable Intelligent NAT, leave the default setting, which is Yes, in order for the
LAN Modem to better support Internet applications and games.
The LAN Modem delivers all unsolicited TCP/UDP packets to the workstation that
is currently communicating with the remote host that has generated these
packets. If you set this field to No, all unsolicited TCP/UDP packets are delivered to
the default workstation.
27 In the Default Workstation for Incoming Packets field, specify the workstation to
which all unsolicited TCP/UDP packets should be delivered.
Note that if the Enable Intelligent NAT field is set to Yes, the LAN Modem first
attempts to deliver the unsolicited TCP/UDP packets to the workstation that is
currently communicating with the remote host that has generated these packets.
Only if no such workstation is found are the packets delivered to the specified
default workstation.
28 Advanced users can review or make changes to the V.90 modem settings
associated with this service provider by clicking Modem Settings. To leave these
values set to their default settings (recommended), click Submit. For information
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Changing the LAN Modem IP Address for Static IP Users
67
This completes the configuration for private network access. A message appears
indicating that your parameters have been set.
for assistance.
If you chose to password-protect the configuration profile of the Dual 56K LAN
Modem and would like to lock and/or change the configuration, refer to
You can now connect up to three more computers and/or printers directly to your
new LAN. To add more than four users using an external hub, refer to
Changing the LAN
Modem IP Address for
Static IP Users
Static IP Address”, and chose to follow the manual procedure, you must now
change the LAN Modem’s default IP address to recognize your statically configured
workstation. The following steps explain how this is done.
1 Access the LAN Modem’s main page by entering the following URL in your Web
browser: http://3com.oc.lanmodem. Alternatively, you can use the numeric
form of this same IP address: http://192.168.1.1.
2 From the Dual 56K LAN Modem’s main configuration page, click the LAN
Parameters icon.
The LAN (Ethernet) Parameters page appears.
3 In the IP Address field, enter your workstation’s original Gateway IP address that
4 Click Submit.
The Dual 56K LAN Modem resets itself.
5 Quit your Web browser.
6 Reset your workstation back to the original network settings you recorded in
7 Restart your workstation.
This completes the setup procedure for using a statically configured workstation
with the LAN Modem.
Setting Up Additional Now that you have finished configuring your Dual 56K LAN Modem for private
Service Provider Profiles network access, you can set up additional Service Provider profiles, if you desire.
To configure an additional Service Provider profile for connection to another
name you assigned to the present private network profile now appears in the
Service Provider profile list.
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68
CHAPTER 6: CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK ACCESS
If you have an ISP account and would like to set up an Internet Service Provider
profile for shared Internet access, refer to Chapter 7, “Configuring Additional
The LAN Modem Main
Configuration Page
Now that you have performed the initial configuration of the LAN Modem, any
further configuration of the unit — for example, adding additional Service
Providers, configuring advanced parameters, or changing current parameters —
can be handled through the Dual 56K LAN Modem’s Main Configuration Page.
Figure 43 Dual 56K LAN Modem Main Configuration Page
The Main Configuration Page provides links to configuration, dialing, and statistics
pages, and to online help. There are links from the illustration icons, from the
buttons on the left-hand side of the page, and from the text links below the
illustration. For each configuration screen, context-sensitive online help is available
in the frame below the main screen. Links to other help topics are also available
from this frame.
You may want to familiarize yourself with the Main Configuration Page and its
various options. A basic description of each link is provided here.
Links From the The links from the illustration icons will take you to the following pages:
Illustration
I
Service Providers: Takes you to the Service Providers page, where you can
configure connections to an additional ISP or to a remote private network, and
specify your V.90 modem settings.
I
Workstations: Takes you to the Workstation Parameters page, where you can
change the associations between specific workstations attached to the LAN
Modem and authenticated service providers, as well as view IP address
information for each workstation.
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The LAN Modem Main Configuration Page
69
I
I
LAN Parameters: Takes you to the LAN Parameters page, where you can
configure Ethernet parameters for your LAN Modem.
Data Call Parameters: Takes you to the Data Call Parameters page, where you
can change settings for Multilink calls and set inactivity timers to allow calls to
be disconnected because of network inactivity, keeping telephone usage and
Internet access costs down.
I
Current Call Status: Takes you to the Current Call Information page, where
you can view information on an active call or calls.
Links from the Buttons
I
I
Home: Takes you back to the Main Configuration Home Page.
ISP Wizard: Allows you to configure an ISP profile using the ISP Wizard. Note
that if you already configured an ISP using the ISP Wizard, invoking the ISP
Wizard again will create a new profile and overwrite any previous settings. If
you would like to add a second ISP profile, use the Service Providers icon to
access the Service Providers configuration page.
I
I
Manual Calling: Takes you to the Manual Calling page, where you can
manually place and disconnect calls.
Statistics: Brings up a secondary set of buttons, through which you can view
statistics on System, Current Call, Last Call, Last 10 Calls, and Service
Providers.
I
I
Dial-in: Brings up a secondary set of Dial-in Configuration buttons, through
which you can access the Dial-in Wizard, Dial-in Global, and Dial-in Users
pages for configuring dial-in support in the LAN Modem.
Advanced: Brings up a secondary set of buttons, through which you can
access the Local DNS Table, Upgrade Check, and Maintenance pages. From
the Maintenance page, you can reset the Dual 56K LAN Modem and set it up
for download of the latest firmware.
I
Password: Takes you to the Password page, where you can change or set the
password for access to the LAN Modem, as well as lock the LAN Modem’s
parameter settings.
To access the Main Configuration Home Page at any time, simply enter the name
or numeric form of the LAN Modem’s IP address in your web browser, as follows:
http://lanmodem
or
http://3com.oc.lanmodem
or
http://192.168.1.1
You may wish to bookmark this page for easy future access.
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CHAPTER 6: CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK ACCESS
The LAN Modem
Support Web Site
If you configured your LAN Modem for indirect access to the Internet through
your private network, you may wish to visit the LAN Modem Support web site,
where you can register your Dual 56K LAN Modem, read any new and up-to-date
information about your product, and perform firmware upgrades to the LAN
Modem as they become available.
To access this LAN Modem Support web site at any time, enter the following URL
in your web browser:
For information on connecting an external hub to your LAN Modem, refer to
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ADVANCED CONFIGURATION
7
This chapter provides instructions on setting up additional Service Provider profiles
(Internet or Private Network), changing your Dual 56K LAN Modem’s default
settings, and configuring advanced parameters. You should first have configured
the LAN Modem for Internet access and/or Private Network access following the
instructions in Chapters 5 or 6 before attempting to configure advanced
parameters.
The configuration windows shown in this chapter may differ slightly from what is
displayed on your computer.
Advanced
Configuration
This section covers the following topics:
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Configuring additional service providers
Editing service provider profiles
Associating service providers with specific computers
Using a connection script
Configuring LAN parameters
Configuring modem control parameters
Changing data call parameters
Specifying a WINS server address
Configuring the Local DNS Table
Reserving DHCP Addresses
Using selective password protection
Changing your password
Locking and unlocking the configuration
Disabling password protection for the Manual Calling screen
Configuring the LAN Modem from a remote location
Checking for Dual 56K LAN Modem upgrades
Configuring
Additional Service
Providers
Once you have configured at least one service provider in the Dual 56K LAN
Modem, you can add service providers for Internet and/or private network access.
You can configure up to a total of four service provider profiles, including any that
you have already created through the initial setup.
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CHAPTER 7: ADVANCED CONFIGURATION
Adding an Internet If you have already configured one Internet Service Provider using the ISP Wizard,
Service Provider as part the initial setup, follow the instructions in this section to add another
Internet Service Provider.
Before you configure an additional Internet Service Provider, have the following
information ready:
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ISP Telephone Number
ISP User ID
ISP Password
ISP DNS Address (required only if your ISP does not use dynamic IP
addressing)
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(Optional) Call Waiting Disable Command (your telephone company can
provide you with this value)
Configuration Steps To configure an additional Internet Service Provider profile, follow these steps:
1 From the Dual 56K LAN Modem ‘s Main Configuration Home Page, click the
Service Providers icon.
Figure 44 Service Provider Selection Window
2 Select New (Internet Service Provider) from the drop-down list box, and then click
Select.
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Configuring Additional Service Providers
73
The Internet Service Provider Parameters window appears.
Figure 45 ISP Parameters Window
3 In the Name field, choose any name that you wish to associate with this ISP.
4 In the Dial Out Prefix field, if applicable, enter the number required by your
location to reach an outside line, if necessary. An example would be dialing “9”
for use with a PBX. If not required, leave this field blank.
5 (Optional) In the Call Waiting Disable Command field, enter the value you
obtained from your telephone company for disabling Call Waiting.
If you have Call Waiting enabled on your line and you do not disable Call Waiting,
then any incoming calls will disrupt your modem connection.
The Dial Out Prefix and Call Waiting Disable Command will automatically be
applied to both telephone numbers that you enter below (if you have more than
one number). If you wish to set up one telephone number that does not require a
dial out prefix, leave the Dial Out Prefix field blank and enter that prefix value as
part of the individual telephone number field itself (for example,
‘918005551000’).
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CHAPTER 7: ADVANCED CONFIGURATION
6 In the Telephone Number 1 field, enter the telephone number you must dial in
order to reach your ISP.
7 (Optional) If your ISP has a second remote access number, enter it in the designated
field, and select Alternate or Multilink from the drop-down list (that is, choose
whether you want to dial this second number as an alternate number when the first is
unavailable, or whether you want to dial this number in addition to the first to create a
high-speed, Multilink (112K) connection).
8 Under Security, enter your ISP User ID and Password (these may be case-sensitive).
9 For Domain Name Service (DNS) IP Address(es), enter the Primary DNS address of
your ISP in the Primary field, if required (that is, your ISP does not automatically
supply these addresses upon establishing a connection). If there is a Secondary
address, enter it in the Secondary field.
10 Under Bandwidth Allocation, choose whether to always use one channel when dialing
out to this private network, add the second channel as needed, or to always use both
channels.
11 Under Callback Parameters, check Enable Callback if you wish to have your private
network’s remote access (receiving) device drop your call and immediately call you
back whenever you connect to the network; otherwise, leave this and the
remaining Callback fields at their defaults.
This function will only work properly if your Service Provider supports Callback
functionality.
If you chose to enable Callback, make the following selections:
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Callback Delay: Callback Delay is the amount of time the ISP will wait before
calling back this LAN Modem. By default this is set to 5 seconds.
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Callback Timeout: Callback Timeout is the amount of time that the LAN
Modem will wait (beyond the Callback Delay) for the ISP to call back. By
default this is 90 seconds.
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Callback Number: Enter your first analog telephone number (this is the
number to which the ISP will place the Callback call). Note that if a different
Callback number has been specified on the server end, the server callback
number takes precedence.
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Callback Username and Password: Enter the username and password of the
callback user. These values are used to verify the server’s authenticity to the
client. Note that callback authentication is optional.
Under Miscellaneous, make the following selections.
12 Choose whether or not you would like to use PPP Data Compression when
transferring data.
13 For Network Address Translation (NAT), your choice depends upon the IP
addressing scheme (dynamic or static) used by the ISP that you will be accessing.
Follow this rule of thumb:
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If you performed the IP Address check in Chapter 3 and optimized your
computer for use with dynamic IP addressing or found that it was already
optimized, choose Yes to leave NAT enabled
If you performed the IP Address check and Set up your computer for static IP
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Configuring Additional Service Providers
75
With NAT enabled, the LAN Modem makes translations between a single
(Internet-routable) IP address issued to it dynamically by the ISP and individual IP
addresses of the computers on the LAN (these are also dynamically assigned, but
by the LAN Modem). This translation allows multiple users on the LAN to access
the ISP by appearing to be a single connection with a single IP address. To better
understand how NAT translation works, refer to the description of NAT in
14 In the WAN Link IP Address and Subnet mask fields, if the ISP to which you are
connecting assigns you a static IP address and subnet mask, enter those values
here. Otherwise, leave these fields empty.
15 For Allow Automatic Call Initiation, leave the default setting which is Yes.
If you select No, you will have to manually launch a call to this service provider
every time you want to connect. You may want to change this field to No later on
if you find that calls are being connected unintentionally as a result of packets
generated by other computers on the LAN.
16 In the Default Workstation for Incoming Packets field, specify the workstation to
which all unsolicited TCP/UDP packets should be delivered.
Note that if the Enable Intelligent NAT field is set to Yes, the LAN Modem first
attempts to deliver the unsolicited TCP/UDP packets to the workstation that is
currently communicating with the remote host that has generated these packets.
Only if no such workstation is found are the packets delivered to the specified
default workstation.
17 For Enable Intelligent NAT, it is recommended that you leave the default setting,
which is Yes, in order for the LAN Modem to better support Internet applications
and games.
The LAN Modem delivers all unsolicited TCP/UDP packets to the workstation that
is currently communicating with the remote host that has generated these
packets. If you set this field to No, all unsolicited TCP/UDP packets are delivered to
the default workstation.
18 In the Default Workstation for Incoming Packets field, specify the workstation to
which all unsolicited TCP/UDP packets should be delivered.
Note that if the Enable Intelligent NAT field is set to Yes, the LAN Modem first
attempts to deliver the unsolicited TCP/UDP packets to the workstation that is
currently communicating with the remote host that has generated these packets.
Only if no such workstation is found are the packets delivered to the specified
default workstation.
19 Click Submit.
20 Advanced users can review or make changes to the V.90 modem settings
associated with this service provider by clicking the Modem Settings button. To
leave these values set to their defaults, click Submit. To change these settings,
If you wish to password-protect the configuration profile of the Dual 56K LAN
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CHAPTER 7: ADVANCED CONFIGURATION
Adding a Private To add a service provider profile for connection to a remote private network,
Editing Service
Provider Profiles
The following steps allow you to edit a previously configured service provider
connection.
1 From the Main Configuration Home Page, click the Service Providers image.
A drop-down list box appears which contains the names of your configured
service providers.
2 Select the name of the service provider connection profile you wish to edit.
The connection profile page appears.
3 Edit the fields as desired.
For more information on the particular fields, refer to the configuration
instructions for the appropriate type of service provider (ISP or Private Network), or
refer to the online help located in the bottom frame on the page.
4 When finished, click Submit.
Restricting Access to If you wish to restrict a particular workstations’s access to one or more service
If you wish to password protect the configuration profile of the Dual 56K LAN
Associating Service
Providers with
Workstations on the
LAN
When you configure a Service Provider on the Dual 56K LAN Modem, by default
that connection is made available to every workstation attached to the LAN. If, for
example, you set up an Internet connection through an ISP and have 25
workstations attached to the LAN, all 25 users will be able to access the Internet
through this connection. The ISP is, by default, “associated” with each user’s
workstation.
You can change these associations through the Workstation Parameters page. For
example, if you want only authorized workstations to have Internet access
through a Service Provider connection, you can associate that Service Provider
exclusively with those workstations. This would all only authorized users on the
LAN access to the Internet from their computers.
To change the association between service providers and specific workstations on
the LAN, follow these steps.
1 From the Main Configuration Home Page, click the Workstations icon.
The Workstation Parameters window appears.
2 Modify the associations for each listed workstation by leaving the box under each
listed Service Provider checked to allow the association, or by clearing the box to
disallow the association.
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Using a Connection Script
77
If you have more than one ISP configured, all automatic calls, such as a call to the
Internet as a result of launching a Web browser, will be routed to the ISP listed in
the first column of the table. If you want your automatic calls to be routed to one
of the other listed ISPs, clear the box(es) for any ISP(s) that you do not wish to use
at this time. The call will go to the first ISP checked.
Click Submit to save your changes.
If you wish to password protect the configuration profile of the Dual 56K LAN
®
Using a Connection
Script
Some service providers, such as CompuServe , require the use of a connection
script to successfully log on to their remote servers. You can create and associate
specific connection scripts with each of the LAN Modem’s four service provider
profiles.
Note that this option is provided only for those remote sites which do not offer
automatic PPP negotiation. You may not be required to create a script for every
service provider profile that you want to access from your LAN Modem.
Before You Begin To create a connection script, you will need the following information from your
service provider.
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Your user name and password.
The Data Bits required by the remote server (either seven or eight).
The Parity setting for the remote server (either none, even or odd).
The number of Stop Bits required by the remote server (either one or two).
Accessing the Script You can associate a unique connection script for each of your four service provider
Configuration Page profiles by entering the script via the LAN Modem’s Script Configuration page.
To access the Script Configuration page, do the following.
1 From the LAN Modem main page, click the Service Providers icon.
The Service Provider Selection page opens.
2 Choose the service provider for which you want to create or edit an existing
connection script and click Select. If you are creating a new service provider,
choose New (Internet Service Provider) or New (Private Network) and click Select.
For instructions on creating or editing service provider profiles, refer to
The Service Provider Parameters page opens.
3 Click the Script button located at the bottom of the Service Provider Parameters
page to access the Script Configuration page.
A dialog box opens.
4 Click OK to enter the Script Configuration page.
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CHAPTER 7: ADVANCED CONFIGURATION
.
Figure 46 Script Configuration Page
Creating a Connection You can create a script from any other text editor of your choice and copy and
Script paste the script directly into the Script Configuration text box. Or you may use the
buttons located along the left side of the script window to guide you through the
scripting process.
Connection Script Command Syntax
The following section explains the valid script command syntax.
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The Begin command (begin) initiates the script. The first line of the script must
start with begin.
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The Delay command (delay second) designates a length of time to wait before
sending the next command in the script. The acceptable values are between
1-60 seconds.
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The SetPort command (setport databit, parity, stopbit) allows you to
match the script to the communication port settings of the remote server. The
valid databit is 8or 7. The valid parity is none, even, or odd. The valid stopbit is
either 1or 2.
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The Transmit command (transmit “text string”) sends a text string to the
remote server. An example of a transmit string might be your account
username or password. This text must be included between the quotation
marks. A carriage return is simulated by the characters ^M within the quotation
marks. The maximum length for this string is 64 characters.
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The WaitFor command (waitfor “string, second”) allows you to designate in
the script to wait before proceeding. An example of text that you might wait
for is the string Username, for which you would send your username as a reply.
If the timeout period elapses before a matching string is received, the script
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Using a Connection Script
79
execution will abort. The maximum stringlength is 64 characters, and the
acceptable secondis between 1-60.
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The End command completes your script. The last line of your script must
conclude with end.
Using the Configuration To create a connection script using the configuration buttons, do the following.
Buttons
1 From the Script Configuration page, click Begin.
The text begin is entered as the first line in the script window.
2 Click Delay to set a delay interval before executing the next line of the script.
The Delay dialog box opens.
3 Enter the amount of time in seconds that your script will wait before proceeding.
This delay interval is used to allow the remote server time to process your request.
Click OK when finished.
The text delay xx is entered in the script window.
4 Click Set Port.
The Data Bits dialog box opens.
5 Enter the number of Data Bits required by your service provider. Click OK when
finished.
The Parity dialog box opens.
6 Enter the Parity setting required by your service provider. Enter e if the remote
server requires Even parity, o if the remote server requires Odd parity, or n if the
remote server requires that parity be set to None. Click OK when finished.
The Stop Bits dialog box opens.
7 Enter 1 to set the stop bits to one, or enter 2 to set the stop bits to two, and then
click OK.
Note the results in the script window. For example, if you chose the default values
for the Begin, Delay and SetPort parameters, the following text will have been
automatically entered:
begin
delay 1
setport 8 n 1.
8 Click WaitFor.
The WaitFor dialog box opens.
9 Enter the string that the remote server will send as a request. An example might
be the word Login: Click OK when finished.
10 Enter the maximum number of seconds to wait for the remote server to send the
connection request. Click OK when finished.
11 Click Transmit.
The Transmit dialog box opens.
Enter the text that you want to transmit to the remote server. An example might
be your username or password. Click OK when finished.
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CHAPTER 7: ADVANCED CONFIGURATION
Add any additional Transmit or WaitFor text as required. Note that a carriage
return is simulated by including ^M within the quotation marks of your transmitted
text. For example: transmit “mypassword^M”will send your password along with a
carriage return.
12 Click End when your script is complete. The last line of text in your script must
conclude with end.
Figure 47 Connection Script Example
13 Click Submit to save your script and return to the Service Provider Page.
All commands are automatically changed to lower case when the script is
submitted.
Once completed, your script will be automatically invoked each time you launch a
call to your service provider.
Additional Configuration Buttons
The Script Configuration page provides the following configuration buttons,
located along the bottom of the script text entry window.
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The Submit button saves your script and returns to the Service Provider
Parameters page.
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The Reset button restores the last saved version of your connection script.
The Erase button clears the script window of all text.
The Back button returns you to the Service Provider Parameters page without
saving any changes made to your script.
If the Back button does not return you to the Service Providers Parameters page
click the Refresh button of your Web browser.
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Configuring LAN Parameters
81
Configuring LAN
Parameters
This section tells you how to configure the parameters of your LAN. A description
of each LAN parameter is provided, followed by the configuration steps. The LAN
Figure 48 LAN (Ethernet) Parameters Window
Understanding LAN The LAN (Ethernet) Parameters window contains the following fields:
Parameters
Name
Displays the name for the Dual 56K LAN Modem. This name is used for DNS
(Domain Name System) resolution and cannot be changed. In the example shown
IP Address and Subnet Mask
The IP address is a unique address which identifies the LAN Modem on your
network. The default address of the LAN Modem (192.168.1.1) is a private IP
address which is automatically translated by the LAN Modem into a public,
Internet-routable address whenever it has to communicate across the WAN. You
should leave the default, unless you are certain that this value must be changed.
You may want to change the default IP address when setting up dial-in access
between two LAN Modems. This will allow you to distinguish between the two
networks, which by default are the same. The LAN Modem’s Dial-in Wizard
Site-to-Site scenario will set these values automatically as needed. Refer to
information.
The subnet mask identifies the subnetwork to which your computer is connected.
You should leave the default unless you are certain that this value must be
changed.
WARNING: If you change the IP address and/or the subnet mask, the LAN Modem
will re-initialize itself to work with the new settings. All calls will be terminated
and you may need to reconfigure the IP address(es) of the computer(s) connected
to your LAN Modem. For a LAN using static IP addresses, you must manually
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CHAPTER 7: ADVANCED CONFIGURATION
reconfigure the workstations’ IP addresses via the Workstations Parameters
window. For a LAN using dynamic IP addresses, restart your workstation to acquire
a new IP address. Or, if you have Windows 95 or 98, launch winipcfg.exe
(probably located in your Windows directory), and click Release All and then
Renew All. For Windows NT, run ipconfig /release and then ipconfig/renew.
Local Domain Name
The local domain name identifies your LAN. LAN refers to the network created by
the LAN Modem and the devices attached to it.
Enable DHCP Server
The LAN Modem provides DHCP server functionality for the LAN which
automatically assigns a network or IP address to a newly attached workstation on
your IP network. If another device on your LAN is providing this functionality, or if
you are using static IP addresses, then you should disable the DHCP server.
NetBIOS Filtering
For Windows Users: NetBIOS is primarily used by Windows 98, 95, NT, and 2000
for local file and printer sharing, although it may also be used on other operating
systems. This protocol can make spurious DNS requests which can inadvertently
cause the LAN Modem to establish unwanted calls to your Service Provider,
resulting in subsequent charges to your phone bill.
The following options are provided.
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Always Block (default): Choosing this option will block all NetBIOS traffic which
has been generated on the local LAN from being passed to the WAN. In this
case, calls will not be placed due to NetBIOS traffic, and NetBIOS traffic will not
be sent to the WAN once calls have been initiated. If you have no need to
perform file or printer sharing over your WAN connection, choose this option.
Note that enabling the NetBIOS filter will not affect your ability to share files
and printers over your LAN.
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Block Call Initiation: This option will prevent NetBIOS traffic which has been
generated on the local LAN from initiating automatic data calls. Once a call has
been established, NetBIOS traffic can then be passed to the WAN over the
established connection. Note however that choosing this option may prevent a
call from automatically timing out.
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Never Block: Choosing this option will allow all locally-generated NetBIOS
traffic to pass to the WAN. Note that enabling this option may cause the
launching of spurious calls, and it may prevent these calls from automatically
hanging up.
Configuring the LAN To configure LAN parameters, do the following.
Parameters
1 From the Main Configuration Home Page, click the LAN Parameters icon.
The LAN (Ethernet) Parameters window appears.
2 In the IP Address field, review the default and enter a different IP address, if
required.
3 In the Subnet Mask field, review the default and enter a different subnet mask, if
required.
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Configuring V.90 Modem Control Parameters
83
4 In the Local Domain Name field, you may choose to enter a name to identify this
particular LAN on a network. Note that this field is not required. Leave blank if you
are unsure about how to configure a local domain name.
5 Check the Enable DHCP server box to enable it or clear the box to disable it.
WARNING: If you change the IP address and/or the subnet mask of your Dual 56K
LAN Modem, the Dual 56K LAN Modem will re-initialize itself when you submit
the changes by clicking Submit. When the re-initialization occurs, all calls are
terminated, and you may have to reconfigure the IP addresses on the computers
on the LAN.
6 For NetBIOS filtering, make your selection from the drop-down list box.
7 Click Submit.
If you wish to password protect the configuration profile of the Dual 56K LAN
Configuring V.90
Modem Control
Parameters
Most users will be able to safely leave the modem control parameters set to their
default values. Advanced users may further define the manner in which the LAN
Modem operates when placing V.90 calls. This section describes modem control
parameters and provides instructions for changing these parameters.
Understanding Modem Each service provider that you configure (up to four) is automatically associated
Controls with its own corresponding modem control profile. If you would like to further
define the performance of the modems for each service provider, you may do so
parameter.
Table 5 Modem Control Parameters
Modem Control Parameter
US/ITU-T answer sequence
Guard Tone
Description
Allows you to set your answer sequence.
Allows you to specify the guard tone for your geographical
region.
56K
If enabled: Sets the minimum CONNECT rate.
If disabled: Sets the ceiling CONNECT rate to 33600.
Sets the make/break ratio for pulse dialing.
Pulse (rotary) dial make/break
ratio
Minimum Connect Speed
Sets the minimum speed at which the modem is allowed to
connect.
Speaker Operations
Dialing
Allows you to change your LAN Modem’s speaker settings.
Specifies either pulse or tone dialing.
Data Compression
Error Control (ARQ)
Advanced Modem init. String
Sets your data compression preference
Sets your error control preference
Advanced users can further modify the modem settings
each time a call is made.
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CHAPTER 7: ADVANCED CONFIGURATION
Changing Modem To access and make changes to the Modem Control parameters, do the following.
Controls
1 From the Main Configuration Page, click the Service Providers icon.
2 Choose the service provider whose associated modem parameters you want to
change, and click Select.
The procedure for accessing the Modem Settings profile is the same for both an
ISP and a Private Network.
The selected Service Provider page opens.
3 Click the Modem Settings button located at the bottom of the Service Provider’s
page.
A dialog box opens. You are asked to save any changes made to the Service
Provider screen.
4 Click Yes to close the Service Provider screen and open the Modem settings.
The Modem Connection Control page opens, as shown in Figure 49.
Figure 49 Modem Controls Page
5 Review the parameters or make changes by selecting an option from each
drop-down list box under the appropriate Modem (Modem 1 or Modem 2).
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Changing Data Call Parameters
85
6 Click Submit to save your changes.
Note that each service provider (up to four) has its own associated Modem
Settings profile. Changes made to one service provider will affect only that
particular service provider.
Changing Data Call
Parameters
This section explains how to configure Data Call Parameter settings. The data call
parameters consist of Timeout Values for both automatic and manual calls, as well
as Bandwidth on Demand Parameters for Multilink calls.
The Timeout Values are a useful means of controlling bandwidth efficiently while
keeping telephone usage and Internet access costs down. If there is no network
activity on a call for a specified amount of time, the call is automatically
disconnected.
The Bandwidth on Demand Parameters allow you to change the threshold (%)
and time delays for adding and dropping the second modem channel of a
Multilink call.
A description of each setting is provided, followed by the configuration steps for
Figure 50 Data Call Parameters Window
Understanding Data Call The Data Call Parameters window contains the following fields:
Parameters
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CHAPTER 7: ADVANCED CONFIGURATION
Timeout Values
Minimum Call Duration for outgoing calls. The minimum call duration is the
minimum length of time that a call must stay up before an inactivity timer can
begin. The default is two minutes.
Disconnecting an Outgoing Automatic Data Call. An automatic data call is
made by the LAN Modem whenever it detects activity on the LAN requiring a
remote connection; an example would be a user launching his or her Web
browser.
You can define the amount of time the LAN Modem should wait before
disconnecting this type of data call due to inactivity. The inactivity timer runs
simultaneously with the minimum call duration. For example, if the minimum call
duration is set to two minutes, and the inactivity timer is set to 30 seconds, the call
will be connected for at least two minutes even if there has been no activity for 30
seconds or more. To prevent a data call from being disconnected due to inactivity,
enter 0 (note that you must then manually disconnect the call via the Manual
Calling screen). The default is seven minutes.
Disconnect an Outgoing Manual Data Call. A manual call is established
using the Manual Calling option from the LAN Modem’s main page. You can
define the amount of time the LAN Modem should wait before disconnecting this
type of data call due to inactivity. This inactivity timer is activated once the
minimum call duration is satisfied and no further activity is detected. For example,
if the minimum call duration is set to two minutes and the inactivity timer is set to
15 minutes, the call will be connected for at least 15 minutes. To prevent a manual
call from being disconnected due to inactivity, enter 0. The default is 15 minutes.
The Desktop Manager for Windows 95/98/2000 and NT is a useful tool for
manually controlling calls without requiring a Web browser. The Desktop Manager
is located on the Companion Programs CD ROM or it may be downloaded from
the LAN Modem Web site:
http://www.3com.com/support/docs/lanmodem/util.html
Redial Attempts for a Manual Call. This field designates the number of times
the LAN Modem will redial a call that is placed using the Manual Call Control
screen. By default this is set to 0. Acceptable values are between 0 and 255 times.
Delay Between Redial Attempts for a Manual Call. This field designates the
length of time in seconds to wait before redialing a manual call. Acceptable values
are between 4 and 240 seconds.
Bandwidth on Demand Parameters
Telephone Number 1. This field specifies the telephone number used for
Line 1. This number is invoked for certain types of Bandwidth on Demand calls.
Telephone Number 2. This field specifies the telephone number used for
Line 2.
Connect/Disconnect Threshold for the Second Channel. If you had specified
use of the second channel “only as needed” under your Service Provider settings,
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Specifying a WINS Server Address
87
indicate the bandwidth percentage threshold at which to allocate of remove the
second channel. By default this threshold is 60%.
Connect Delay. If you had specified use of the second channel “only as
needed” under your Service Provider settings, indicate the length of time that the
LAN Modem should wait before adding the second channel, once the default
threshold has been breached. By default the length of time is 10 seconds.
Disconnect Delay. If you had specified use of the second channel “only as
needed” under your Service Provider settings, indicate the length of time that the
LAN Modem should wait before removing the second channel, once the default
threshold has been breached. By default the length of time is 20 seconds.
Outgoing Call Control
Enable Outgoing Calls on Line 1. Check this box to enable the LAN Modem
to place outgoing calls on modem 1. If you want to prevent any outgoing calls
from being placed on this line, uncheck this box. Outgoing calls are enabled by
default.
Enable Outgoing Calls on Line 2. Check this box to enable the LAN Modem
to place outgoing calls on modem 2. If you want to prevent any outgoing calls
from being placed on this line, uncheck this box. Outgoing calls are enabled by
default.
To disable all outgoing calls from being placed by any device on the LAN, uncheck
both boxes for Outgoing Call Control.
Configuring the Data To configure data call parameters, follow these steps:
Call Parameters
1 From the Dual 56K LAN Modem Main Configuration Page, click the Clock icon.
2 Specify the Data Call Parameters.
3 Click Submit.
If you wish to password-protect the configuration profile of the Dual 56K LAN
Specifying a WINS
Server Address
WINS (Windows Internet Naming Service) is used on Windows NT servers to
associate a computer’s host name with its IP address. If you have a WINS server
setup on your network, you can specify the IP address of the WINS server via the
LAN Modem’s Maintenance page.
To set a WINS server address, do the following.
1 From the LAN Modem’s Main page, click the Advanced button.
The Advanced submenu opens.
2 Click the Maintenance button.
The Maintenance page opens.
3 In the WINS Server Address field, specify the IP address of your network’s WINS
server.
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CHAPTER 7: ADVANCED CONFIGURATION
4 Click Submit.
Configuring the Local
DNS Table
The Dual 56K LAN Modem includes a local DNS Table for configuring up to ten
static DNS entries. This allows the LAN Modem to resolve designated IP addresses
locally. The Local DNS Table can be used to suppress spurious calls which can occur
when an application on the LAN generates packets which in turn launch an
unwanted call to your service provider.
For example, to suppress spurious calls, do the following. If an application on the
LAN is generating packets to a particular domain address, such as
“company.com”, you would enter that name (“company.com”) in the Domain
Name field, and then enter 192.168.1.29 in the IP address field. This is an IP
address that resides on the LAN Modem’s default subnet, but by default is not
used by any attached workstations. Now, packets to “company.com” will be
routed to this unused IP address, and will no longer launch automatic calls.
Another potential application of the Local DNS Table is to assign a domain name
to a frequently visited IP address. In this case, you would enter the IP address in the
IP address field, and enter a domain name of your choice, such as “my_site.com”
in the Domain Name field. This will resolve the name “my_site.com” to the
associated IP address.
I
To access the DNS Configuration Table, follow these steps:
1 From the LAN Modem Main Configuration Page, click the Advanced button.
2 Click the Local DNS Table button.
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Reserving DHCP Addresses
89
Figure 51 Local DNS Table
3 Enter the domain names and IP addresses as desired, and click Submit to save
changes.
Reserving DHCP
Addresses
If you have workstations on your LAN with static IP addresses and other
workstations on the same LAN with dynamic IP addresses, it is recommended that
you reserve the static IP addresses in the DHCP server to ensure that they are not
dynamically assigned to another workstation.
Reserve DHCP addresses as follows.
1 From the LAN Modem main page, click the Workstations graphic.
The Workstation Parameters window opens.
2 Click the Workstation Configuration tab.
3 Locate the Workstation for which you would like to reserve the IP address on the
DHCP server.
4 Check the box labeled Reserved.
5 Click Submit.
If you want to password protect the configuration profile of the ISDN LAN
Changing Your
Password
A password allows you to restrict access to the Dual 56K LAN Modem’s
configuration screens. To change the password which was defined as part of the
initial setup, or to set a password for the first time, do the following:
1 From the Dual 56K LAN Modem Home Page, click the Password button.
The Password window appears, as shown in Figure 52.
Figure 52 Password Window
2 Under Change Password, enter the new password in the Password field.
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90
CHAPTER 7: ADVANCED CONFIGURATION
3 Enter the same password in the Password (repeat) field to verify.
Make sure you have deleted the old password completely before reentering the
new password.
4 Check the box if you wish to disable password protection for the Manual Calling
screen only. This allows workstations on the LAN to access only the Manual Calling
screen from the LAN Modem Home Page without a password, so that they can
place and terminate manual calls. All other pages remain inaccessible without a
password.
5 Click Submit.
Once you have set a password on your LAN Modem, and the unit remains idle for
five minutes or longer, you may be “locked out” of the LAN Modem Home Page. If
this occurs, you will be prompted to enter your password in order to gain access to
the Home Page again.
What If I Forget My If you forget your password, you must reset the Dual 56K LAN Modem to the
Password? factory default settings, which will allow you to enter a new password. Note that
when the Dual 56K LAN Modem is restored to the factory default settings, all
configuration changes are lost, including your service provider profiles. For
instructions, refer to Chapter 10, “Resetting the Dual 56K LAN Modem.”
Locking and Unlocking
the Configuration
If you chose to password-protect the Dual 56K LAN Modem when you initially
configured the unit, you can lock and unlock the LAN Modem configuration
parameters from this page. Locking the LAN Modem means that you evoke the
password protection immediately, rather than waiting for the five minute timeout.
If you did not set a password on the LAN Modem during the initial configuration,
you cannot lock the LAN Modem’s parameters.
To lock the configuration:
1 From the LAN Modem Main Configuration Page, click the Password button.
2 Under Lock Configuration, click the Lock Configuration button.
A message indicates that the configuration is locked.
To unlock the configuration:
1 When the Lock Configuration, screen opens, click Continue.
The Enter Password window appears.
2 Enter your password to access the Dual 56K LAN Modem Main Configuration
Page.
3 Click Submit.
The Dual 56K LAN Modem Main Configuration Page appears. You now have
access to all of the LAN Modem configuration screens.
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Using Selective Password Protection
91
Using Selective
Password Protection
You can set up partial password protection so that workstations may access only
the Manual Calling screen, allowing them to manually place and receive calls only.
In this case, all other WebWizard pages remain inaccessible.
Note that enabling selective password protection also allows all users access to the
LAN Modem Home Page so that they can navigate to the Manual Calling screen. If
users attempt to access any page other than Manual Calling or online help, the
LAN Modem prompts the user to enter a password.
To set up selective password protection, follow these steps:
1 From the LAN Modem Home Page, click the Password button.
2 Check the box labeled Disable password protection for the Manual Calling screen.
3 Click Submit.
All workstations are now able to access the Manual Calling screen by clicking the
Manual Calling button from the LAN Modem Home Page. For instructions on
placing manual calls, refer to Chapter 9, “Placing a Call Manually.”
Configuring the LAN
Modem from a
Remote Location
This section provides instructions for dialing in to the Dual 56K LAN Modem from
a remote location, using either a modem or another analog LAN Modem, in order
to make configuration changes. To access the Dual 56K LAN Modem from a
remote location, you must have a Web browser and any PPP dialer software, such
as Windows 95/98’s Dial-Up Networking, installed on the remote computer.
Before you can make remote configuration changes to the LAN Modem, the
default Remote Administration Username and Password must be known.
Authorized users who dial in to the LAN Modem using the Remote Administration
password to make remote configuration changes are allowed access only to the
LAN Modem itself (that is, its configuration screens); not to any networked devices
“behind” the unit. This prevents an unauthorized user from dialing in to a LAN
Modem that has been configured for full dial-in support and making configuration
changes.
If you are dialing in to the Dual 56K LAN Modem for remote configuration
purposes only, it is not necessary to configure the unit for full dial-in support.
However, for dial-in access to networked devices “behind” the LAN Modem, refer
support.
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CHAPTER 7: ADVANCED CONFIGURATION
Changing the Remote By default, the Dual 56K LAN Modem’s default Remote Administration Username
Administration is Admin, and the Password is 1234. For security purposes, it is recommended
Password that you change the default password. To do so, follow these steps:
1 From the Dual 56K LAN Modem Main Configuration Page, click the Dial-in
button.
2 Click the Dial-in User button.
The Dial-in User Selection window opens.
3 Select Admin, and then click Next.
4 In the Username field, delete the default name, and enter a unique Username.
5 In the Password field, delete the default password and enter a new Password.
Record this information for use by an authorized remote user or users only.
6 Click Submit.
Configuring the LAN To dial in to the Dual 56K LAN Modem to make remote configuration changes
Modem Remotely via using another LAN Modem, follow these steps:
Another LAN Modem
Auto Answer must be enabled to allow dial-in access to the LAN Modem. By
default, Auto Answer is disabled; in this case, all incoming calls will be routed to
any analog equipment connected to one of the PHONE ports. Refer to
1 Ensure that the two LAN Modems are on different subnetworks.
For instance, one LAN Modem can be on the 192.168.1.x subnetwork, and the
other one can be on the 192.168.2.x subnetwork.
2 In the local LAN Modem (from which you are accessing the remote Dual 56K LAN
Modem), create a Private Network Service Provider profile for the remote Dual 56K
LAN Modem.
3 Under Security, enter the Remote Administration Username and Password
assigned to the remote LAN Modem.
4 Under Miscellaneous, leave the WAN Link IP Address field blank.
5 Enter the IP address of the remote LAN Modem in your Web browser’s URL field.
A connection is established.
6 Enter your password, if applicable.
The LAN Modem Main Configuration Page of the remote Dual 56K LAN Modem
appears. You now have full access and can make any configuration changes as if
you were connected via the local LAN.
You are not able to browse the Internet while remotely accessing your LAN
Modem. During a remote configuration of the ISP Wizard, clicking the Continue
button will not place a call to your ISP to confirm a successful configuration.
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Configuring the LAN Modem from a Remote Location
93
Configuring the LAN To dial into a LAN Modem from a remote location using an analog modem and
Modem Remotely via an Windows 95/98 Dial-Up Networking, follow these steps:
Analog Modem
1 Click Start, Programs, Accessories, (Windows 98 users select Communications)
and select Dial-Up Networking.
2 Double-click Make New Connection.
The Make New Connection window opens.
3 Enter a name to designate this dial-up profile, such as LAN Modem.
4 Select the modem attached to your local PC from the drop-down list box, and click
Next.
The Make New Connection phone number window will open.
5 Enter the phone number of the remote LAN Modem to which you wish to connect
and click Next.
6 Click Finish to complete the Make New Connection setup.
You will now have a new icon for the connection just created.
7 Right-click this new icon, and choose Properties.
8 Click the Server Type tab.
For Windows 95 users: PPP, Windows 95, Windows NT 3.5, Internet should be
chosen in the Type of Dial-Up Server list box.
For Windows 98 users: PPP, Internet, Windows NT Server, Windows 98, should be
chosen in the Type of Dial-Up Server list box.
9 Under Advanced Options, uncheck all boxes.
10 Choose the TCP/IP check box for Allowed Network Protocols. Uncheck the boxes
for NetBEUI and IPX/SPX Compatible.
11 Click TCP/IP Settings.
The TCP/IP Settings window opens.
12 Click Specify an IP address and enter an IP address for your computer. Enter
192.168.2.1 if you are not sure.
13 Leave the other options for this window at their default settings, including the
radio button for Server assigned name server addresses.
14 Click OK to close the TCP/IP Settings window.
15 Click OK to close the Server Types window.
16 Click OK to close your connection window.
17 Double-click your new connection icon created via Dial-Up Networking.
The Connect To window will open.
18 Enter the Remote Administration Username and Password that was assigned to
the Dual 56K LAN Modem. By default, the Username is Admin, and the Password
is 1234.
19 Click Connect.
Your local computer will dial and establish a connection with your remote LAN
Modem.
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CHAPTER 7: ADVANCED CONFIGURATION
20 Once your call has been established, launch a Web browser on your local
computer.
The Web browser attempts to load its default Start Page. Click Stop to cancel this
procedure.
21 Enter the following address in your Web browser’s address bar:
http://192.168.1.1to go to the remote LAN Modem’s Main Configuration Page.
If you previously set your LAN Modem’s IP address to something other than the
factory default address, enter this IP address in your Web browser’s address bar in
place of the address shown in the URL above.
22 If the LAN Modem is password-protected, re-enter the Password, and then click
Submit.
The LAN Modem Main Configuration Page appears. You now have full access and
can make any configuration changes as if you were connected via the local LAN.
You are not able to browse the Internet while remotely accessing your LAN
Modem using the steps described in this section. To access the Internet or other
devices on the remote LAN, you must first set up the LAN Modem for Dial-in
The Dual 56K LAN Modem has an Upgrade Check feature which will query the
You must have at least one Service Provider configured with Internet access in
order to use this feature.
To check for new firmware updates, following these steps:
1 From the LAN Modem Home Page, click the Advanced button.
2 Click the Upgrade Check button.
The Check for Upgrades window opens.
3 Click Check for Upgrades.
A call is launched to your service provider. The LAN Modem compares the latest
available firmware against the firmware currently installed.
If your LAN Modem has the latest firmware installed, you receiving a message
saying that it is not necessary to upgrade at this time.
If a more current version of the firmware has been released, you receive a message
indicating that new firmware is available. Click the Download link to access the
LAN Modem Upgrade page. Follow instructions for your operating system to
download the latest firmware.
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CONFIGURING THE DUAL 56K LAN
MODEM FOR DIAL-IN SUPPORT
8
This chapter describes how to configure the LAN Modem for dial-in support. The
following topics are covered.
I
I
I
I
Understanding Dial-in Basics
Understanding the Three Dial-in Profile Types
Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support
Part II. Configuring a Client Device for Dial-out Access
The configuration windows shown in this chapter may differ slightly from what is
displayed on your computer.
Understanding Dial-in
Basics
Setting up the LAN Modem for dial-in support is a two-part process involving the
following main steps:
Part I. Configuring the server-side LAN Modem to receive incoming, dial-in calls.
This includes:
I
I
Changing the Remote Administration Username and Password
Configuring Dial-in Global Parameters (general parameters that apply to
all dial-in calls.)
I
Creating a Dial-in User Profile for each dial-in profile (up to ten) that will
make incoming calls to the server-side Dual 56K LAN Modem.
Part II. Configuring a client device (such as an analog modem or second LAN
Modem) for dial-out access to the server-side LAN Modem
Since the device that dials out to the server-side LAN Modem may also be a LAN
Modem, the terms “server” or “server-side” and “client” or “client-side” are used
throughout this chapter to distinguish between the LAN Modem that receives
dial-in calls (server-side) and the LAN Modem or other device that makes dial-out
calls (client-side). In some cases, the same LAN Modem will be configured as both
a server-side LAN Modem and a client-side device.
The Dual 56K LAN Modem can only accept dial-in calls from another analog
device, such as an analog modem, a 56K LAN Modem or Dual 56K LAN Modem,
or another analog router. It cannot accept dial-in calls from an ISDN terminal
adapter or an ISDN LAN Modem.
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CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT
Understanding the
When you create a Dial-in User Profile as part of the server-side LAN Modem
configuration process, you must select from among three Dial-in Profile Types to
identify the type of client device that will dial in to the server-side LAN Modem.
This section explains the three dial-in profile types and tells you when to select one
over the other.
Single User Dial-in The Single User Dial-in profile applies to any client device that uses a single IP
address (issued by the server-side LAN Modem) to communicate with the
server-side LAN Modem across the WAN. The client device which dials into a
remote LAN Modem for Single User Dial-in is often a single analog modem.
Single User Dial-in may also use an analog router (such as a second LAN Modem)
that uses Network Address Translation (NAT) to share one IP address among
multiple users, similar to a typical ISP connection. Note that unlike the LAN
Modem Site-to-Site profile (described later), the Single User scenario does not
provide for bidirectional LAN-to-LAN connectivity. While authorized workstations
attached to the client LAN Modem can share the connection to the remote LAN
Modem, workstations connected to the server LAN Modem cannot access
client-side resources.
Choose Single User Dial-in when your dial-in user will access a server LAN
Modem via a single analog modem, or via a LAN Modem that will share one IP
address for all attached workstations. Note that in this scenario, workstations on
the server-side cannot access client-side resources.
scenarios.
192.168.1.2
192.168.1.3
192.168.254.1
192.168.254.1
MODEM
CD RD
1
MODEM
CD RD
2
LAN Status
Message
Power
Public telephone
network
AA
SD
OH
AA
SD
OH
TX
COLL
1
2
3
4
OfficeConnect Dual 56k LAN Modem
Alert
OfficeConnect
Dual 56K LAN Modem
Dial-in user with
analog modem
calls into LAN Modem
192.168.1.4
192.168.1.5
LAN Modem issues
single IP address to
incoming client
Server-side LAN
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Understanding the Three Dial-in Profile Types
97
Figure 53 Single User Dial-in from an Analog Modem
192.168.1.2
2
.
8.2
2.16
9
1
192.168.1.3
192.168.1.4
192.168.1.5
192.168.254.1
192.168.254.1
MODEM
CD RD
1
MODEM
CRD
2
LAN Status
Public telephone
network
Message
Power
AA
SD
OH
AA
D
OH
TX
CO
1
2
3
4
192.16
OfficeConnect Dual 56k LAN Modem
Alert
8.2
.
3
OfficeConnect
OfficeConnect
Dual 56K LAN Modem
56K LAN Modem
Server-side LAN Modem issues
single IP address to
client-side LAN Modem
Client-side LAN Modem
calls into server-side LAN Modem
and receives IP address.
Client-side LAN
NAT then translates issued IP address
among attached workstations
Server-side LAN
Figure 54 Single User Dial-in from an Analog Router Using NAT
LAN Modem Site to Site The LAN Modem Site-to-Site Dial-in profile describes a scenario where a LAN
Dial-in Modems dials into another LAN Modem, where workstations on both sides of the
connection can access servers and resources on each LAN. Because each LAN
Modem resides on different subnets, the Site-to-Site scenario provides
bi-directional LAN-to-LAN connectivity.
When the Site-to-Site scenario is first configured via the Dial-in Wizard (refer to
client LAN Modem will automatically change its default IP address and restart. This
is to distinguish between each LAN Modem’s subnet address, which by default are
identical (192.168.1.x).
Choose this dial-in profile type if you are setting up a network between two or
more sites, using a LAN Modem at each site, and you want any device on any LAN
to be able to communicate directly with any other device on any other LAN
(“peer-to-peer” networking). Note that when you choose the LAN Modem
Site-to-Site Dial-in profile, you must perform both sets of configuration step
sequences—create a dial-in profile and create a service provider connection—on
each LAN Modem.
In a LAN Modem Site-to-Site setup, neither LAN Modem uses NAT for IP address
translation. This allows workstations from both LANs to “see” and therefore send
packets to workstations on the opposite LAN. In addition, users on either LAN can
refer to workstations on the opposite LAN by domain name, as well as IP address.
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CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT
This is because the called LAN Modem acts as the DNS server for workstations
attached to the calling LAN Modem. An example of a LAN Modem Site-to-Site
The called LAN Modem
acts as DNS server to perform
workstation name-to-IP address
192.168.1.2
resolution for this call
192.168.2.2
192.168.1.3
192.168.1.4
192.168.1.5
192.168.2.3
192.168.2.4
192.168.2.5
192.168.1.1
192.168.1.1
MODEM
CD RD
1
MODEM
CD RD
2
LAN Status
Public telephone
network
MODEM
CD RD
1
MODEM
CD RD
2
LAN Status
Message
Power
Message
Power
AA
SD
OH
AA
SD
OH
TX
COLL
1
2
3
4
AA
SD
OH
AA
SD
OH
TX
COLL
1
2
3
4
OfficeConnect Dual 56k LAN Modem
OfficeConnect Dual 56k LAN Modem
Alert
Alert
192.168.1.1
Site A
LAN Modem
192.168.2.1
Site B
LAN Modem
The called LAN Modem
issues its own IP address
as WAN IP address for this call.
Figure 55 LAN Modem Site-to-Site Dial-in Profile Type
Choose LAN Modem Site-to-Site when your dial-in user will access a LAN
Modem from another LAN Modem, where LAN resources are accessible on both
ends of the connection.
Advanced Dial-in The Advanced Dial-in profile applies to a network scenario in which a router
other than a LAN Modem will be dialing into the Dual 56K LAN Modem.
Advanced Dial-in assumes that both the Dual 56K LAN Modem and the other
router have been manually configured for static IP addressing, and each employs a
unique range of addresses, as shown in Figure 56.
192.168.1.2
100.101.102.2
192.168.1.3
100.101.102.3
MODEM
1
MODEM
2
LAN Status
COL
OfficeConnect Dual 56k LAN Modem
Public telephone
network
Message
Power
1
2
3
4
TX
LK
RX
CO
AA
C
D
R
D
D
OH
AA
C
D
R
D
S
D
H
TX
1
2
3
4
Alert
192.168.1.1
OfficeConnect
Dual 56K LAN Modem
100.101.102.1
Analog router
192.168.1.4
192.168.1.5
100.101.102.4
100.101.102.5
(other than LAN Modem)
Figure 56 Advanced Dial-in Profile Type
Choose Advanced Dial-in if your LAN is using static IP addressing, or your dial-in
user will be accessing a LAN Modem from a router other than a LAN Modem.
Note that the Advance Dial-in is the most complex dial-in scenario and may
require the assistance of your MIS administrator. Refer to “Creating a Private
Advanced dial-in parameters, for more information.
Once you have chosen a dial-in scenario that best fits your dial-in criteria, you are
ready to configure the server-side LAN Modem for dial-in access. Refer to “Part I.
define dial-in users.
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Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support
99
Part I. Configuring the
LAN Modem for
Configuring the server-side Dual 56K LAN Modem for dial-in support involves the
following main steps:
Change the Remote Administration
Username and Password
Configure
Dial-in Global Parameters
Create a Dial-in User Profile
for the Client Device
Before You Start the Before you start the configuration, you should already have completed the
Configuration
following steps:
I
Run the EZ-LAN tool or performed the TCP/IP and IP Address check on the
workstation you are using to configure the Dual 56K LAN Modem, as described
I
Installed the Dual 56K LAN Modem hardware, as described in Chapter 4.
Note that any remotely-located device that you wish to access on a remote LAN
Modem, such as a workstation or server must be running appropriate software,
such as Web or FTP server software. Examples of server software are Apple’s
Personal Web Sharing for the Macintosh or Microsoft’s Peer Web Services for
Windows 95/98. Check with your computer’s accompanying documentation for
more information.
Changing the Remote The Remote Administration account is a restricted version of a Dial-in User Profile
Administration which allows for limited dial-in access to the Dual 56K LAN Modem for remote
Username and Password configuration purposes only. By default, a Remote Administration account is
already set up in the LAN Modem, with the following defaults:
Username:
Password:
Admin
1234
Before you configure the Dual 56K LAN Modem for full dial-in access, it is
recommended that you change these defaults as follows:
1 From the LAN Modem Main Configuration Page, click the Dial-in button.
2 Click Dial-in User.
The Dial-in User Selection window opens.
3 Select Admin, and then click Select.
4 In the Username field, delete the default name, and enter a unique Username.
5 In the Password field, delete the default password and enter a new Password.
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CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT
6 Click Submit.
This completes the change to the Remote Administration account. Go on to
Configuring Dial-in The Dial-in Global Parameters allow you to set dial-in preferences that will apply to
Global Parameters all dial-in users. These include designating a Callback prefix, setting a Site Number
for LAN-to-LAN dial-in, configuring Auto Answer, and setting authentication
preferences.
To configure Dial-in Global Parameters in the server-side Dual 56K LAN Modem,
follow these steps:
1 From the LAN Modem Main Configuration page, click the Dial-In button.
2 Click Dial-in Global.
Figure 57 Dial-In Global Parameters Window
3 In the Channels allocated for Dial-in field, select 1 to allocate only one telephone
line for dial-in calls (the default). Choose 2 to allow both telephone lines to be
used for dial-in calls, either by a single user making a Multilink PPP call, or by two
users dialing in simultaneously.
4 In the Allow Multilink field, check the box to allow both telephone lines to be used
by a single caller for a Multilink call, or leave the box unchecked to allow only one
line per dial-in call. Note that if you choose to allow Multilink, both telephone lines
will be used for each dial-in call received. Dial-out calls cannot be placed until the
Multilink dial-in call ends. Multilink PPP is disabled by default.
In order for Multilink to work, the Channels allocated for Dial-In field must be set
to 2.
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Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support 101
5 If you are planning to use the Callback feature, use the Callback Prefix field to
enter the number required to reach an outside line, such as a 9. Otherwise, leave
this field blank.
6 In the LAN-to-LAN Site Number drop-down list box, designate the LAN Modem
site for dial-in access from other LAN Modems (which will dial into this LAN
Modem via the Site-to-Site scenario). Note that setting the site number may
change the IP address of the LAN Modem, as described below.
I
Choose None (the default) if you are configuring this LAN Modem to receive
dial-in calls from a Single User Dial-in client. This option will leave the LAN
Modem’s IP address unchanged.
Advanced users may also want to choose None if the LAN Modem has already
been manually configured for static IP addressing.
I
Choose Site A if you are setting up a Site-to-Site network with two or more
LAN Modems, and this is the first LAN Modem that you are configuring (in
other words, this LAN Modem will place and/or receive calls to another LAN
Modem).
Choosing Site A will designate the LAN Modem’s IP address to 192.168.1.1
(the LAN Modem’s factory default). Note that if you have previously changed
the LAN Modem’s IP address, choosing Site A will always revert the IP address
back to 192.168.1.1.
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Choose Site B if you are setting up a site-to-site network with two or more LAN
Modems and you have already designated another LAN Modem as Site A.
Choosing Site B will cause this LAN Modem to change its IP address to
192.168.2.1. This is to differentiate between the two LAN Modem subnet
address, which by default are the same.
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Choose Site C if you are setting up a site-to-site network with two or more LAN
Modems and you have already designated another LAN Modem as Site A
and/or Site B.
Choosing Site C will cause this LAN Modem to change its IP address to
192.168.3.1.
7 In the Auto Answer drop-down list box:, choose the number of rings (up to nine)
before each modem automatically answers an incoming call. To use the dial-in
features of the LAN Modem, Auto Answer must be enabled.
Auto Answer must be enabled to allow dial-in access to the LAN Modem. By
default, Auto Answer is disabled on both modems; in this case, all incoming calls
will be routed to any analog equipment connected to one of the PHONE ports.
8 In the PPP Authentication field, choose the type of PPP authentication you want
the LAN Modem to use when negotiating all dial-in calls. By default, PAP, CHAP
and MS-CHAP are enabled. This means that if the client-side device can perform
any of these three authentication types, the authentication process will be
successful. Note that at least one must be enabled.
9 Click Submit to save your changes.
If you choose Site B or Site C as the LAN to LAN Site Number, the LAN Modem will
re-initialize itself as it changes its IP address. The front panel LEDs flash during this
process, indicating that a reset is in progress.
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CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT
Once the LAN Modem has changed its IP address, you will no longer be able to
access the configuration screens through your Web browser until you re-start your
workstation and allow it to acquire a new IP address from the LAN Modem’s new
subnet.
10 If you chose Site B or C, re-start your workstation. This will allow your workstation
to acquire an IP address as part of the LAN Modem’s new subnet.
This completes the Dial-in Global Parameters portion of the server-side
Creating a Dial-In User Before dialing into a LAN Modem, a dial-in user account must be created for every
Profile Using the Dial-In user or remote site that requires access. To create a dial-in user profile on the
Wizard central LAN Modem using the Dial-in Wizard, refer to the appropriate application
below for specific Dial-in Wizard instructions. For more detailed descriptions of
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A Dial-in User Profile must be configured for each device that requires dial in
access. In the case of a second LAN Modem, one Dial-in User Profile can be shared
among all workstations attached to the remote LAN Modem.
Dial-in Wizard for Single To create a Dial-in User Profile for a Single User Dial-in client device, follow these
User Dial-in
steps:
1 From the LAN Modem Main Configuration Page, click the Dial-In button
2 Click the Dial-In Wizard button.
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CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT
The Dial-In Wizard Password window appears, as shown in Figure 59.
Figure 59 Dial-In Wizard Password Window
4 Enter a unique Username and Password which the dial-in user must enter when
calling in to this LAN Modem.
This information will be entered in the Username and Password fields when you
configure your client device.
5 Click Next.
The Dial-In Wizard Internet Service Provider Selection window appears.
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Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support 105
Figure 60 Dial-In Wizard Internet Service Provider Window
6 Select an Internet Service Provider for this dial-in user to use when accessing the
Internet from the remote location.
7 Click Finish.
This completes the server-side portion of the configuration process for a Single
User dial-in. If you wish to use the LAN Modem’s Callback feature, you must
configure Callback parameters for this LAN Modem from the Dial-in User
instructions.
To configure the client-side device for dial-out access to this LAN Modem, refer to
Dial-in Wizard for LAN To create a Dial-in User Profile for a remote LAN Modem, follow these steps:
Modem Site-to-Site Dial-in
1 From the LAN Modem Main Configuration Page, click the Dial-In button.
2 Click the Dial-In Wizard button.
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CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT
Figure 61 Dial-In Wizard Profile Type Selection Window
3 Select LAN Modem Site-to-Site from the drop-down list, and then click Next.
The Dial-In Wizard Password window appears, as shown in Figure 62.
Figure 62 Dial-In Wizard Password Window
4 Enter a unique Username and Password for the second site LAN Modem.
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Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support 107
This information will be entered in the Username and Password fields when you
configure a Private Network Service Provider profile in the second site LAN
Modem.
5 Click Next.
The Dial-In Wizard Site Assignment window appears, as shown in Figure 63.
Figure 63 Dial-In Wizard Site Assignment Window
6 Using the drop-down list box, specify the site name you would like to designate
for the dial-in user’s remote LAN Modem, A, B or C.
Note that this Site name must be different from the Site name designated in this
(local) LAN Modem’s Dial-In Global Parameters. In other words, if you have already
designated this LAN Modem as Site A, you would designate the dial-in profile you
are creating as Site B or Site C.
7 Click Next.
The Dial-In Wizard Internet Service Provider Selection window appears, as shown
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CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT
Figure 64 Dial-In Wizard Internet Service Provider Window
8 Select an Internet Service Provider for this dial-in user to use when accessing the
Internet from the remote location.
9 Click Finish.
This completes the server-side portion of the configuration for LAN Modem
Site-to-Site Dial-in. To allow for Site-to-Site configuration, you must also do the
following:
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Configure the second site LAN Modem as both a server-side LAN Modem and a
client-side device, following the same procedure that you used to configure
this LAN Modem.
If you wish to use the LAN Modem’s Callback feature, you must configure
Callback parameters for this LAN Modem from the Dial-in User Parameters page.
Dial-in Wizard for Advanced To create a Dial-in User Profile for Advanced Dial-in, follow these steps:
Dial-in
1 From the LAN Modem Main Configuration Page, click the Dial-In button.
2 Click the Dial-in Wizard button.
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Part II. Configuring a Client Device for Dial-out Access 109
Figure 65 Dial-In Wizard Profile Type Selection Window
3 Select Advanced from the drop-down list, and then click Next.
The password page appears.
4 Enter a unique Username and Password to identify and verify this analog router
when it calls in to the LAN Modem.
This information must be entered in the analog router when it is configured for
calling into this LAN Modem.
5 Click Next.
The dial-in user parameters page appears. Continue with the steps under
Part II. Configuring a
To configure a client device for dial-out access to the server-side LAN Modem,
refer to the appropriate section for your type of client device:
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Configuring an Analog To configure an analog modem for dial-out calling, use the appropriate software—
Modem for Dial-out for example, Dial-Up Networking if you are a Windows user—to create a remote
Calling connection to the server-side Dual 56K LAN Modem.
For the basic steps for creating a dial-out modem connection using Dial-Up
Networking, you can refer to the section, “Configuring the LAN Modem Remotely
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CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT
Configuring a LAN To configure a LAN Modem that will use the Single-User scenario to access a
Modem Using remote LAN Modem, you create a Private Network Service Provider profile
Single-User Dial-out much as you would for standard Private Network access. You must first, however,
Access perform the additional step of changing the LAN Modem’s IP address. This is
because the remote LAN Modem’s IP address is identical, by default.
Before You Start the Before you start the configuration, you should already have completed the
Configuration
following steps:
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Run the EZ-LAN Wizard or performed the TCP/IP and IP Address check on the
workstation you are using to configure the client LAN Modem, as described in
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Installed the client LAN Modem hardware, as described in Chapter 4 (steps will
differ slightly if you are using a regular 56K LAN Modem).
Changed the LAN Modem’s IP address, as described below (this prevents a
possible IP address conflict with the server-side LAN Modem).
Changing the LAN Modem’s To change the IP address, do the following.
IP Address
1 From the LAN Modem Main Configuration Page, click the LAN Parameters icon.
The LAN (Ethernet) Parameters window appears.
2 In the IP address field, change the IP address to 192.168.2.1.
The LAN Modem re-initializes itself. The front panel LEDs flash, indicating a reset in
progress.
Once the LAN Modem IP address has been changed, you can no longer access the
LAN Modem until your workstation has been restarted and has acquired an IP
address belonging to the new LAN Modem subnet.
3 Restart your workstation.
The default IP address for the local LAN Modem will have been changed to
192.168.2.1. Similarly, all attached workstations, once re-started, will utilize an IP
address belonging to this new subnet (192.168.2.x).
Configuring a LAN To configure a LAN Modem which will access a remote LAN Modem via the LAN
Modem (LAN Site-to-Site scenario, you create a Private Network Service Provider profile,
Site-to-Site) for Dial-out much as you would for standard Private Network access. Remember, however,
Access that each LAN Modem you configure for client, dial-out access must also be
configured as a server-side LAN Modem.
Before You Start the Before you configure this LAN Modem for dial-out access, you should already have
Configuration
done the following:
I
Configured the unit as a server-side LAN Modem, as described in “Part I.
Because one of the initial steps of the server-side configuration is to assign each
LAN Modem a separate Site identity, (A, B, or C), which can cause the LAN
Modem to change its IP address, configuring the LAN Modem for server-side
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Part II. Configuring a Client Device for Dial-out Access 111
configuration first will ensure that the LAN Modem occupies a subnet different
from the LAN Modem into which it will be dialing.
Creating a Private Network To create a Private Network Service Provider profile for dial-out access, have the
Service Provider Profile
following information ready:*
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Telephone number(s) of the server-side LAN Modem
The Username and Password assigned to this LAN Modem when you
created a Dial-in User Profile in the server-side LAN Modem
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IP address and subnet mask of the server-side LAN Modem
If the server-side is Site A, use IP address 192.168.1.1; if Site B, use
192.168.2.1; if Site C, use 192.168.3.1. The subnet mask in each case is
255.255.255.224. If you chose not to assign a Site number to the
server-side LAN Modem, the IP address and subnet mask can be found on
the LAN Parameters page of the server-side LAN Modem (by default,
192.168.1.1 and 255.255.255.224, respectively).
In addition, if you want to use the Callback feature, have the following ready:
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Callback Telephone number(s) (that is, the telephone number(s) of this LAN
Modem)
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Callback Username and Password (should match the values entered in the
Dial-in Users Parameters page on the server-side LAN Modem)
* If this is the first (Site A) LAN Modem in a LAN Site-to-Site setup, and if you have not yet
completed the Site B or Site C server-side configuration, then the Username and
Password for this LAN Modem have not yet been defined. In this case, keep in mind as
you follow the steps that “server-side” in this context may refer to the not-yet-configured
Site B or Site C LAN Modem. In other words, some of the required Private Network values
may not have been defined at this point.
Private Network, except that they are specifically oriented toward the LAN Modem
dial-in scenarios.
To create a Private Network Service Provider profile in the client LAN Modem:
1 From the LAN Modem’s Main Configuration Page, click the Service Providers icon.
The Service Provider Selection window opens.
2 Select New (Private Network) from the drop-down list box, and click Select.
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CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT
Figure 66 Private Network Parameters Window
3 In the Name field, enter a name for this Service Provider, such as the location of
the server-side LAN Modem.
4 In the Dial Out Prefix field, if applicable, enter the number required by your
location to reach an outside line, if necessary. An example would be dialing “9”
for use with a PBX. If not required, leave this field blank.
5 In the Telephone Number 1 field, enter the telephone number of the server-side
LAN Modem.
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Part II. Configuring a Client Device for Dial-out Access 113
6 In the Alternate drop-down list box, you can select Alternate and enter the second
LAN Modem telephone number, to be dialed if the first number is unavailable. Or,
if the server LAN Modem was set up to allow Multilink dial-in calls, select Multilink
and enter the second telephone number. Otherwise leave this field blank.
7 Under Security, enter the Username and Password assigned to this LAN Modem
when the Dial-in User Profile was created in the server-side LAN Modem.
8 Under DNS Addresses, leave these values blank.
9 Under Bandwidth Allocation, choose whether to always use one channel when dialing
out to the server-side LAN Modem; whether to always use both channels, or whether
to add the second channel as needed.
10 Under Private Network Parameters, specify the parameters of the server-side LAN,
as follows:
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Private Network IP Address. Enter the IP address of the server-side LAN
Modem. If the server-side LAN Modem was designated as Site A, enter
192.168.1.1 (if as Site B, enter 192.168.2.1; if as Site C, enter 192.168.3.1).
If you chose not to assign a Site number to the server-side LAN Modem,
enter 192.168.1.1, unless you manually changed the IP address as part of
an advanced, static IP setup.
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Subnet Mask: Set this value to 255.255.255.224.
Domain Name: Enter the domain name of the server-side LAN Modem, if
applicable. This field may be left blank if you have entered a Private
Network IP Address. If you want to access client LAN resources via domain
name (for example, “Site A”), enter an appropriate domain name.
11 Specify Callback parameters if you want to use this feature. Otherwise, leave the
defaults.
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Enable Callback: Choose to enable or disable Callback. By default Callback
is disabled.
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Callback Delay: Leave the default setting, which is 10 seconds. Callback
Delay is the amount of time the server will wait before calling back the
client.
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Callback Timeout: Leave the default setting, which is 90 seconds. This is the
amount of time that the client waits for the server to call back. Note that
this value is in addition to the Call Back Delay value.
Callback Number: Enter the number that the far end will call back when the
LAN Modem connects to the remote server. This allows for the reversing of
toll charges for the dial-in call. Note that if a different number is configured
on the server, the server callback number takes precedence.
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Callback Username and Password: Enter the username and password of the
callback user. These values are used to verify the server’s authenticity to the
client. These fields should match the login and password fields on the server
LAN Modem’s dial-in user parameters. Note that callback authentication is
optional.
12 Under Miscellaneous, make the following selections:
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Choose whether or not you want dial-in users to access the Internet through
the server LAN Modem’s ISP connection (if there one has been configured).
13 Choose whether or not you would like to use Data Compression when
transferring data.
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CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT
14 For Network Address Translation, your choice depends on the Dial-User Profile
Type that you selected for this LAN Modem, as follows:
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If you are configuring this LAN Modem for Single-User LAN Modem using
NAT, leave NAT enabled.
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If you are configuring this LAN Modem for LAN Site-to-Site, disable NAT.
15 Under WAN Link IP address, leave these fields blank. The LAN Modem will
automatically assign these values upon connection.
16 Under Subnet Mask, leave these fields blank. The LAN Modem will automatically
assign these values upon connection.
17 For Allow Automatic Call Initiation, leave the default setting which is Yes.
If you select No, you will have to manually launch a call to this service provider
every time you want to connect. You may want to change this field to No later on
if you find that calls are being connected unintentionally as a result of packets
generated by other computers on the LAN.
18 For Enable Intelligent NAT, leave the default setting.
19 In the Default Workstation for Incoming Packets field, specify the workstation to
which all unsolicited TCP/UDP packets should be delivered.
Note that if the Enable Intelligent NAT field is set to Yes, the LAN Modem first
attempts to deliver the unsolicited TCP/UDP packets to the workstation that is
currently communicating with the remote host that has generated these packets.
Only if no such workstation is found are the packets delivered to the specified
default workstation.
20 Click Submit.
This completes the configuration of the LAN Modem as a client device.
Configuring Dial-in
User Parameters
Once you have created a Dial-in User profile using the Dial-in Wizard, you can
further define the dial-in user parameters using the Dial-in User Parameters page.
You can also use this page to configure an Advanced Dial-in User profile, or to
create any Dial-in User profile without the Dial-in Wizard.
You can create a total of ten dial-in user profiles. If you have created ten profiles
and would like to add a new user, you must delete one profile before adding the
new one.
To access Dial-in User profiles, do the following:
1 Click the Dial-in Users button.
The Dial-in User Selection screen opens, as shown in Figure 67.
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Configuring Dial-in User Parameters 115
Figure 67 Dial-in User Selection Screen
2 Choose either New Dial-in User to create a new profile, or choose an existing
Dial-in User from the drop-down list, and click Select.
The Dial-in User Parameters screen opens, as shown in Figure 68.
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CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT
Figure 68 Dial-in Users Parameters Screen
3 In the Name field, enter a unique name to designate this dial-in user.
4 In the Password field, enter a password to verify access when this user dials into
the LAN Modem.
5 In the Type of Use field, select the scenario for which your dial-in situation applies:
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Choose Single-User Dial-in if this user will be accessing the LAN Modem
from a regular analog modem or second analog LAN Modem on which
attached workstations can share a single IP address using NAT.
Choose LAN Modem Site-to-Site if this user will be dialing in from another
LAN Modem which is being configured as both a server-side and client-side
device (for “peer-to-peer” networking).
Choose Advanced if this user will be accessing the LAN Modem from a
router other than a LAN Modem. This scenario requires that all IP addresses
be statically configured, and should be configured by your MIS
administrator.
6 In the Idle Timer field, enter the length of inactivity before the LAN Modem drops
the incoming call. By default this value is 900 seconds (15 minutes).
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Configuring Dial-in User Parameters 117
7 In the ISP Selection field, select the service providers that this dial-in user can
access.
8 In the Data Compression field, choose to have data compression active or inactive.
By default compression is disabled. (In order for compression to occur, the other
end of the connection must also have compression active.)
Callback Parameters
This section allows you to enable and configure callback functionality. Callback
occurs when, upon a successful connection of dial-in a user, the LAN Modem
drops the incoming call and places a return call to the dial-in user. In order for
callback to work properly, the client-side device must also have callback active.
To specify your Callback parameters, follow these steps:
1 In the Enable Callback field, check to activate Callback for this dial-in user. By
default, Callback is disabled.
2 In the Callback Telephone Number field, enter the number the LAN Modem will
call back when this dial-in user accesses the LAN Modem.
3 In the Callback Alternate Number field, enter a second telephone to be used for
either Multilink PPP or as a second number to try if the call cannot be established
with the first telephone number.
4 In the Callback Authentication field, check the box to require callback
authentication.
5 In the Callback Username field, enter the username used by the server if callback
authentication is requested by the client.
6 In the Callback Password field, enter the password used by the server if callback
authentication is requested by the client.
7 In the Callback Delay field, enter the amount of time in seconds to wait until the
dial-in user is called back. By default this is set to 10.
WAN Parameters
If you used the Dial-in Wizard to create this Dial-in User profile, these fields should
be left as set by the Dial-in Wizard.
1 LAN Modem WAN IP: If the local LAN Modem WAN link has a static IP address,
enter the WAN static IP address. Otherwise leave these fields as set by the Dial-in
Wizard. If you are using the Advanced dial-in scenario, enter the IP address of the
LAN Modem which is receiving the dial-in call.
2 Remote LAN IP: If the remote site of the WAN link has a static IP address, enter the
WAN static IP address. Otherwise, leave these fields as set by the Dial-in Wizard.
For the Advanced dial-in scenario, enter the IP address of the router which is
dialing into the LAN Modem.
3 Remote LAN Subnet Mask: If the remote site of the WAN link has a static IP
address, enter the subnet mask of the remote LAN. Otherwise, leave these fields
as set by the Dial-in Wizard. If you are using the Advanced dial-in scenario, enter
the subnet mask of the remote LAN.
4 Enter your Primary and Secondary (optional) DNS address as instructed by your
MIS administrator, or as set by the Dial-in Wizard. For the Advanced dial-in
scenario, enter the IP address of the LAN Modem which is receiving the dial-in call.
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CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT
Placing a Call from a
Client-side LAN
Modem
Once you have created a service provider profile on your client LAN Modem, you
can place a call in one of three ways:
1 Use the client LAN Modem’s Manual Call Control page to place a call manually.
2 Use the LAN Modem Desktop Manager on a client workstation to place a call
manually.
3 Enter an IP address or domain name of a server attached to the remote LAN
Modem, and place the call automatically. Note that this option assumes that you
have configured a Private Network as your service provider, and not an ISP.
Once connected, you can use all LAN resources available on the server end of the
connection. For further information, visit the LAN Modem’s Internet Homepage at
http://www.3com.com/support/docs/lanmodem.
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PLACING, RECEIVING AND
DISCONNECTING CALLS
9
This chapter covers the following main topics:
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Using the LAN Modem Desktop Manager (Windows only)
Placing calls
Receiving calls
Disconnecting calls
Using the LAN Modem
The LAN Modem Desktop Manager for Windows 95, 98, NT, and 2000 provides
direct access to LAN Modem call functionality directly from the Windows desktop,
without requiring the use of a Web browser.
The Desktop Manager provides the following functionality:
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Monitor call status information
Access the LAN Modem Main Configuration Page
Launch and bring down calls to previously configured Service Providers
The LAN Modem Desktop Manager is included on the OfficeConnect Dual 56K
LAN Modem Companion Programs CD-ROM. Once installed, the application
resides in the Windows Tool Tray. No configuration of the Dual 56K LAN Modem is
necessary.
In addition to the CD-ROM, the application may be downloaded directly from the
LAN Modem Utilities website:
http://www.3com.com/support/docs/lanmodem/util.html
Placing Calls
In addition to the LAN Modem Desktop Manager, you can place calls to a remote
location in one of two additional ways: automatically, through one of the
pre-configured service providers, or manually, either by using one of the
pre-configured service providers, or by entering the telephone number of a remote
destination on a call-by-call basis.
3Com assumes no liability for phone charges or other expenses incurred in
connection with the use of this product.
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CHAPTER 9: PLACING, RECEIVING AND DISCONNECTING CALLS
Placing a Call To place a call using one of your four pre-defined service provider profiles, simply
Automatically launch the application. For example, if you have an ISP configured as one of your
service providers, launching a Web browser such as Netscape Navigator or Internet
Explorer will cause the LAN Modem to automatically dial and connect you to this
pre-configured ISP.
Call Routing Among Service Providers
When you launch an application that initiates an automatic dial-out call, the
LAN Modem automatically calls the first configured service provider. For instance,
if you have two pre-configured ISPs, the LAN Modem will always call the first
configured ISP whenever you launch your Web browser.
If you configure a second service provider, such as an additional ISP, and you want
this second service provider to be the first destination called for automatic data
calls, do the following:
1 Access the Dual 56K LAN Modem’s Main Configuration Page.
2 Click the Workstations icon.
3 Locate your computer’s name in the list of workstations.
4 Leave only the service provider that you want to use for automatic data calls
checked for your computer, and uncheck all other service providers.
5 Click Submit to save your changes.
Another option would be to delete the first ISP and then add it back as your
second ISP.
Placing a Call Manually You can manually place a data call from the LAN Modem’s Manual Call Control
window, instead of having the LAN Modem to do this automatically. When you
place a call manually, you can either select one of your pre-configured service
providers as the remote destination, or you can place a call to a temporary
destination that has not been configured as a service provider.
To place a manual call to a configured service provider, do the following.
1 From the Dual 56K LAN Modem home page, click the Manual Calling button.
The Manual Call Control window appears.
2 In the table, locate the name of the service provider that you wish to call. Verify
that a call is not already connected to this or any other destination by looking
under the Status of Call column.
3 Click Place Call.
A message indicates that the call is being placed. The LAN Modem’s OH LED lights
up green, indicating a call in progress. Once connected, the CD LED lights up,
indicating a successful connection to the remote server. You may then run any
program appropriate for that location, such as ftp to transfer files or a Web
browser to access the Internet.
Outgoing calls will always be placed on the first available analog telephone line.
To terminate any call in progress, click the Abort Call button at any time.
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Receiving Calls 121
Placing a Call Manually You can also manually place a call to a service provider that has not been
to a Temporary Service previously configured, as long as that service provider issues IP addresses
Provider dynamically to the calling party. To place a call manually to a temporary location,
follow these steps:
This call profile will remain under TempSvcProvider until you change the settings
of these fields.
1 From the LAN Modem Home Page, click the Manual Calling button.
The Manual Call Control window appears.
2 In the table, locate TempSvcProvider.
3 Click Place Call.
4 Enter the telephone number of the destination in the Telephone Number field.
5 Enter your User ID for the remote destination.
6 Enter your Password for the remote destination.
7 Enter the DNS address if the remote destination does not automatically provide an
IP address. Otherwise, leave this field empty.
8 Click Make Call.
A message indicates that the call is being placed. The LAN Modem’s OH LED lights
up green, indicating a call in progress. Once connected, the CD LED will light up,
indicating a successful connection. Once connected, you are ready to run any
desired application appropriate for that location, such as ftp to transfer files. Or,
you may enter a different URL in your Web browser to access the Internet.
Once a temporary call is established, other workstations may join this call by
clicking Participate in Existing Call from the Manual Call Control page. Note that if
multiple parties share the connection established as a TempSvcProvider, the call
can be disconnected only by the workstation that initiated the temporary call.
Receiving Calls
The Dual 56K LAN Modem can receive both voice and data calls, as follows:
Receiving Voice Calls Voice calls received by the Dual 56K LAN Modem will be routed by default to any
analog equipment connected to one of the PHONE ports, assuming that a data
call is not currently connected. To install an external analog device, simply connect
the device to one of the Dual 56K LAN Modem’s two PHONE ports using standard
RJ-11 to RJ-11 cables provided with your analog equipment. Refer to “Installing
Receiving Data Calls The Dual 56K LAN Modem can receive incoming data calls for the following
purposes:
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From a remote analog modem, second analog LAN Modem, or other analog
router.
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Making changes to LAN Modem configuration settings.
for instructions.
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CHAPTER 9: PLACING, RECEIVING AND DISCONNECTING CALLS
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Downloading the latest firmware.
for instructions.
Reviewing Dual 56K LAN Modem statistics
Auto Answer must be enabled for your LAN Modem to receive an incoming data
Answer setting.
Disconnecting Calls
You can disconnect calls manually via the LAN Modem or the Desktop Manager, or
utilize built-in timers to disconnect calls automatically.
Disconnecting Calls To disconnect calls manually, follow these steps:
Manually
1 From the Main Configuration Page, click the Manual Calling button.
The Manual Call Control window appears.
2 In the table, locate the name of the service provider from which you wish to
disconnect, and then verify that the call is active (“Up”) under the Status of Call
column.
3 Click Hangup Call.
A message indicates that the call is being disconnected.
To disconnect calls with the Desktop Manager (Windows users only), simply click
your right mouse button and disconnect a call.
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Disconnecting Calls 123
Disconnecting Calls Disconnect timers are set via the Data Call Parameters window. Specifically, you
Automatically Using can set the following parameters:
Timers
Minimum Call Duration
Enter the minimum length of a call that must be reached before the Dual 56K LAN
Modem detects inactivity on the connection and then starts an inactivity timer. The
default is 120 seconds (two minutes), which is also the lowest value allowed for
this field.
Idle Timeout
In the fields Disconnect a data call after how long of an inactivity period?, enter
the number of seconds after which a call should be disconnected due to inactivity.
This timer is initiated once the minimum call duration is satisfied and no further
activity is detected. To prevent a data call from being disconnected due to
inactivity, enter 0. The default for an automatic call is 420 seconds (seven
minutes). The default for a manual call is 900 seconds (15 minutes).
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CHAPTER 9: PLACING, RECEIVING AND DISCONNECTING CALLS
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TROUBLESHOOTING AND
MAINTENANCE
10
This chapter explains how to isolate and solve problems encountered with the
Dual 56K LAN Modem, such as problems caused by incorrect settings or improper
installation. Basic maintenance information for the Dual 56K LAN Modem is also
provided.
The following main topics are covered in this chapter:
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Checking the basics
Monitoring the LEDs
Evaluating symptoms and solutions
Finding more information
Contacting technical support
Downloading firmware
Resetting the LAN Modem
Reviewing statistics
Synchronizing the LAN Modem clock
CAUTION: There are no user-serviceable parts inside your Dual 56K LAN Modem.
Unauthorized opening of the unit will void the warranty.
Checking the Basics
Before you monitor the LEDs or refer to the symptoms and solutions section,
check the following:
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Verify that the cables are not physically damaged. If damage is apparent,
replace the cable.
Verify that the power cord is connected to the LAN Modem and an electrical
outlet.
Verify that the analog telephone cables are properly connected to the LAN
Modem and their telephone wall outlets.
Monitoring LEDs
If you are experiencing operational inconsistencies, you can monitor the Alert and
LAN Status LEDs to isolate problems.
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CHAPTER 10: TROUBLESHOOTING AND MAINTENANCE
Monitoring the Alert Power cycle the Dual 56K LAN Modem and observe the Alert LED. During the
LED power-up self-test, the Alert LED will remain lit.
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If the Alert LED goes off, the test has been successful.
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If the Alert LED flashes for more than several seconds, it means the LAN
Modem is either in firmware download mode or there is an internal failure. If
the LAN Modem is not in firmware download mode, notify your reseller that
the Dual 56K LAN Modem has failed the self-test and order a replacement.
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A fast flash of the Alert LED indicates that the DHCP server has issued all of the
available IP addresses and is unable to fulfill a request for a new IP address.
more information.
Monitoring the LAN Observe the LAN Status LEDs labeled 1, 2, 3, or 4, depending on the port to which
Status LEDs a workstation is attached. If the LAN Status LED is lit for the correct port, it means
that the LAN Modem detects the Ethernet link signal and operation is normal.
When the computer attached to this port is transmitting data to the LAN, this LED
flashes.
If the LAN Status LED is not lit on the port to which a workstation is attached, the
LAN Modem does not detect the Ethernet link integrity signal. Refer to “During
The Ethernet cable may not be properly connected, or the cable may be the wrong
polarity.
Evaluating Symptoms
and Solutions
solutions.
Table 6 Symptoms, Causes, and Solutions
Symptom Possible Cause
During installation, LAN Status Ethernet cable is not securely
Solution
Check the Ethernet cable connection. Make sure it is
inserted properly in LAN port 1,2,3, or 4 on the back of
the Dual 56K LAN Modem and in the Ethernet port on
the back of your computer.
LED does not light up
connected.
Ethernet card is not set up
properly.
Make sure your Ethernet card is set up properly (for
example, proper drivers are loaded). Refer to the
documentation provided with your Ethernet card for
instructions.
Upon initial setup, launching
the Web browser does not
start the configuration process Modem.
(the welcome message does
Your Web browser needs the IP Enter the following URLs in your Web browser:
address of the Dual 56K LAN
http://192.168.1.1. Alternatively, you can enter
http://3com.oc.lanmodem.
Or, the browser is not set to a
default start page.
not appear).
(continued)
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Evaluating Symptoms and Solutions 127
Table 6 Symptoms, Causes, and Solutions
Symptom
Possible Cause
Solution
Incompatible IP address on your Reset the IP address on your computer, as follows:
computer
Windows 95 and 98:
1 Run winipcfg.exe.
2 Select the Ethernet adapter connected to the Dual
56K LAN Modem.
3 Click Release All and then Renew All.
Windows 2000 and NT 4.0:
1 Run ipconfig /release and then ipconfig /renew.
Macintosh:
1 From the Apple menu, select Control Panels, and
then TCP/IP.
2 In the Connect via field, make sure Ethernet is
selected.
3 In the Configure field, select Using BootP Server to
clear the fields.
4 Close and save your changes.
5 Re-open the TCP/IP control panel, and select Using
DHCP Server. The fields should now read <will be
supplied by server>.
6 Select File, then Close, saving your changes.
Your Web browser may be
Launch your Web browser, and set it to use the LAN
configured to use a proxy server. Modem, as follows:
Internet Explorer:
1 From the View menu, choose Internet Options.
2 Click the Connection tab.
3 Uncheck the box labeled Connect using proxy
server.
Netscape Navigator:
1 From the Edit menu, choose Preferences.
2 Under Advanced, choose Proxies.
3 Check the box labeled Direct Connection to the
Internet.
There is a configuration problem. Reset the Dual 56K LAN Modem to the factory default
in this chapter for assistance.
The wrong cable may be
Make sure you are using the 8-pin to 8-pin cable
connected to the LAN port on the labeled Ethernet that was provided with your Dual 56K
Dual 56K LAN Modem and your LAN Modem. If you are using another 10BASE-T
computer.
Ethernet cable, it must be a straight-through cable.
Workstation is set to use a Static
IP address
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Configure the workstation to use dynamic IP
Or:
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Follow the setup procedure for a
(continued)
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CHAPTER 10: TROUBLESHOOTING AND MAINTENANCE
Table 6 Symptoms, Causes, and Solutions
Symptom
Possible Cause
Solution
Clicking Submit in the LAN
JavaScript may not be enabled in Enable JavaScript in your Web browser
Modem’s configuration pages your Web browser.
does not take you to the next
screen
Refer to your browser’s documentation for
information.
Sending SMTP mail is slow.
Only one workstation to one
server is supported at one time
for SMTP mail.
If more than one workstation starts an SMTP mail
session to the same remote server at the same time,
the mail transfer rate for each additional workstation
will be slowed.
Although multiple service
providers are configured, all
calls are going to the same
You may not have configured the From the Dual 56K LAN Modem’s home page, click
IP address and the subnet mask
in the Private Network
Service Providers and then select the private network
profile you already configured. Enter the IP address and
the subnet mask for the private network.
service provider which is an ISP Parameters window.
Upon launching Web browser, Dial-Up Networking is set up for To bypass the Connect To window:
Windows 95’s Connect To
window opens.
use with a serial port modem.
1 From the Start menu, select Settings, Control Panel.
2 Double-click Internet.
3 Click the Connection tab.
4 Clear the checkbox labeled Connect to the Internet
as needed, or check the Connect to the Internet
using a local area network radio button.
5 Click OK.
This allows all outgoing connections to run directly
through your Dual 56K LAN Modem each time you
launch your Web browser.
During installation, Alert LED
remains lit
An internal failure.
Notify your reseller or technical support that the Dual
56K LAN Modem has failed the self-test.
During installation, Alert LED
continues to flash
Self-test failure, or LAN Modem is Power-cycle the Dual 56K LAN Modem. If the Alert LED
in firmware download mode
continues to flash, the LAN Modem has failed the
self-test. Contact your network supplier. If the Alert
LED is no longer flashing, then the LAN Modem is now
operating correctly.
Alert LED fast-flashes. (This
may occur as a result of
replacing a workstation on the unable to fulfill a request for a
The DHCP server has issued all of From another computer attached to the LAN Modem:
the available IP addresses and is
1 Go to the LAN Modem’s Main Configuration Page.
LAN with a new computer.)
new IP address.
2 Click Workstations.
3 Click the Workstation Configuration tab.
4 Locate the name of the computer you removed, and
click the Release button.
5 Reboot the newly-added workstation; it will now be
assigned an IP address by the LAN Modem.
Cannot place outgoing calls.
Telephone line cables, power
cable and/or phone cables may
not be firmly connected.
Check all cables and connectors to ensure that they are
inserted securely.
Telephone cables may not be
inserted into the correct port.
Ensure that the incoming analog telephone lines have
been connected the ports labeled LINE 1 and LINE 2 on
the LAN Modem’s back panel.
A data call may be in progress.
Disconnect any data calls currently in progress.
Make sure the Virtual Fax Modem is not active on the
telephone line.
(continued)
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Evaluating Symptoms and Solutions 129
Table 6 Symptoms, Causes, and Solutions
Symptom
Possible Cause
Solution
You are using only one telephone If you are only using one telephone line with your LAN
line with the LAN modem, and it Modem, it must be connected to Line 1. In this case,
is connected to the Line 2 port.
make sure that you connect the telephone line to the
port labeled “Line 1” on the LAN Modem’s back panel.
Outgoing calls have been
disabled.
Make sure that outgoing calls are enabled. Refer to
more information.
MODEM CD LEDs do not
remain green.
The user name and/or password Make sure that the user name and password for this
for this service provider may not service provider are entered accurately on the Service
be entered properly.
Provider page.
A connection has been
established (CD LED remains
lit), but data cannot be sent.
There is an interoperability
mismatch between the local and have communications capability and are properly
remote applications. configured.
Make sure that the local and remote data applications
Cannot send faxes with the
Virtual Fax Modem
Fax application does not support Make sure you are using a Fax application that supports
Class 2.0 faxes, or is not set to
use Class 2.0 faxing.
and is set to use Class 2.0 faxing (Class 2 and Class 2.0
are not the same). An example of a Fax application that
supports Class 2.0 is provided on the 3Com
Companion Programs CD ROM, or may be downloaded
from the LAN Modem Utilities Web site
(http://www.3com.com/support/docs/util.html).
Calls continue to reconnect, or An application or LAN device is
calls do not time out and
disconnect.
sending IP packets.
Make sure that the Dual 56K LAN Modem’s data call
timeout value is not set to 0. Check the timeout values
configured for the LAN Modem, as explained in
Using the Manual Calling page, drop the call, wait for
the spurious call to be re-connected, and then check
Current Call Information from the Statistics page for
Reason for call coming up.
If the situation persists, disconnect each attached LAN
device to locate the source of the IP packet generation.
Or, you can turn off Automatic Call Initiation, located
on each service provider parameter page. In this case,
all outgoing calls can be made via the Manual Call
Control page.
Some application software
does not work properly
The application may have an
embedded IP address, which
causes a problem when NAT is
enabled on the LAN Modem.
If you have a static network, disable NAT and try the
application again.
A complete list of applications tested for use with the
LAN Modem is located at
http://www.3com.com/support/docs/lanmodem/
Unable to connect at 56Kbps
56K may not be supported by
your remote server
In order to take advantage of 56K-based analog
connections, your remote server (such as an ISP) must
support 56K technology. To locate a 56K-enabled ISP
in your area, visit http://www.3com.com/56K.
FCC limitations
Current FCC rules restrict the power output of a Service
Provider’s modems, limiting download speeds to
53Kbps.
Poor line conditions
Check with your telephone company to ensure that
maximum clarity exists for your telephone lines.
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CHAPTER 10: TROUBLESHOOTING AND MAINTENANCE
Table 6 Symptoms, Causes, and Solutions
Symptom
Possible Cause
Solution
(continued)
LAN Modem is not answering Auto Answer is set to Disable.
Dial-in data calls
Auto Answer must be enabled for the LAN Modem to
answer incoming data calls. By default Auto Answer is
Browser is not displaying newly Web browser may be caching
Web browsers often cache previously-visited pages.
This means that the browser may not always display
information that has recently changed.
entered information.
older pages.
There are two possible solutions for this issue.
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Set your Web browser to display the newest version
of page each time the page is loaded (refer to your
Web browser’s documentation for instructions).
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Click “Refresh” from your browser’s menu bar to
display the latest information.
Second channel is not
automatically added as
bandwidth needs increase
Only one telephone line
connected to the LAN Modem.
Connect a second analog telephone line. In order to
add a second channel as needed, you must have two
telephone lines connected to each ‘Line” port on the
back panel of the LAN Modem
Service Provider’s Bandwidth
Allocation is not configured to
“Add Second Channel as
Needed.”
Set the Bandwidth Allocation to “Add Second Channel
as Needed” via the Service Provider Parameters Page.
You can set the Connect/Disconnect threshold value via
the LAN Modem’s Data Call Parameters page.
Change the Connect/Disconnect
threshold for the second channel.
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Finding More Information 131
Finding More
Information
For more information about the Dual 56K LAN Modem, such as Frequently Asked
Questions and specific technical notes, go to the following URL,
http://www.3com.com/support/docs/lanmodem and bookmark this site for quick
and easy access.
Contacting Technical
Support
Contact your Network Supplier or refer to the technical support card that was
included with your LAN Modem to find the technical support telephone number
for your location.
Downloading
Firmware to Your Dual
56K LAN Modem
Your Dual 56K LAN Modem has been designed to be user-upgradeable. The latest
firmware for your Dual 56K LAN Modem is available at
http://www.3com.com/support/docs/lanmodem. Refer to the Upgrade instructions
at the same location for instructions on downloading firmware.
Resetting the Dual
56K LAN Modem
There are two types of resets you can perform, a normal reset and a factory reset.
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A normal reset will leave all user-entered configuration parameters unchanged.
Any active calls will, however, be terminated.
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A factory reset restores the Dual 56K LAN Modem configuration to the factory
default settings listed in Appendix D. All user-entered parameters are lost.
To reset the Dual 56K LAN Modem, follow these steps:
1 From the Dual 56K LAN Modem Main Configuration Page, click the Advanced
button.
2 Click the Maintenance button.
3 Select the type of reset you would like to perform, normal or factory.
Resetting the Dual 56K If you are unable to access the LAN Modem Main Configuration Home Page
LAN Modem to the because your computer cannot communicate with the LAN Modem, you can
Factory Defaults restore the LAN Modem to the factory default settings using the reset switch
located on the unit’s back panel. To reset the LAN Modem using the reset switch,
do the following:
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Press the reset button located on the back of the unit once and then release.
The Alert LED will begin to flash, indicating a reset in progress.
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While the Alert LED is still flashing, press and continue to hold in the reset
button. (You must continue to hold the reset button through three more cycles
of LED flashing: Reset, Firmware Download Mode, and Factory Default Reset.)
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The first cycle begins after approximately ten seconds. The Alert LED will begin
to flash, indicating that the unit has been reset. This first reset is similar to a
power-cycle of the unit. All user-entered information is maintained.
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The second cycle of Alert LED flashing indicates that the unit has entered
firmware download mode.
After the Alert LED has flashed for the third cycle, you have successfully reset
the Dual 56K LAN Modem back to factory defaults.
Release the reset button.
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CHAPTER 10: TROUBLESHOOTING AND MAINTENANCE
The Dual 56K LAN Modem reinitializes itself, and goes back to its factory
default settings. All user-entered information has been erased.
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Restart your computer.
Launch your Web browser.
Reviewing Statistics
Various statistics about LAN and WAN parameters are stored and available for
review.
To view statistics, follow these steps:
1 From the Dual 56K LAN Modem Main Configuration Home Page, click the
Statistics button.
2 Select the type of statistics you would like to review.
You can view the following types of statistics:
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System
Current Call
Last Call
Last 10 Calls
Service Providers
Refer to the appropriate table for a list and description of the information
provided for each type of statistic.
Statistics
Table 7 Description of System Statistics
System Statistics
Product ID
Description
Displays the product ID of the Dual 56K LAN Modem.
Displays the serial number of the Dual 56K LAN Modem.
Displays the Ethernet address of the Dual 56K LAN Modem.
Serial Number
Ethernet Address
System software version number Displays the firmware version of the Dual 56K LAN Modem.
Boot software version number For internal use only.
The LAN Modem has been up for Displays the length of time the Dual 56K LAN Modem has
been running. This timer is cleared when the unit is power
cycled or reset.
Date (Month/Day/Year)
Time (Hour:Minute:Second)
Modem 1
Lists the current date of the LAN Modem*
Lists the current time of the LAN Modem*
Displays the DSP version of Modem 1
Displays the DSP version of Modem 2
Modem 2
* This date and time is based on the computer initially used to set up the LAN Modem.
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Reviewing Statistics 133
Call Information
Table 8 Current Call Statistics Description
Current Call Information
Description
Connect Message
Indicates the modem CONNECT message received for the
current call.
Call direction
Indicates whether the current call is incoming or outgoing.
Service provider name
Indicates the destination to which the current call is
connected.
IP address in use
Indicates the IP address assigned by the service provider.
Primary DNS address
Indicates the primary DNS address of the service provider to
which the current call is connected.
Secondary DNS address
Data call options
Indicates the secondary DNS address of the service provider to
which the current call is connected. This field will be empty if a
secondary DNS address is not needed.
If the current call is a data call, indicates the type of data call
(i.e.,PPP), the type of PPP authentication negotiated, and
whether hi/fn LZS compression is on or off. For example,
PPP PAP/Compression-On.
Call start time
Displays the date and time the call began.
The call has been up for
(minutes, seconds)
Indicates the length of time (in minutes and seconds) that this
current call has been connected.
The connection has been idle Indicates the length of time (in minutes and seconds) that this
for (minutes, seconds)
current call has been idle.
Number of octets received
Indicates the number of octets (bytes) received by the Dual
56K LAN Modem.
Number of octets transmitted Indicates the number of octets (bytes) transmitted by the Dual
56K LAN Modem.
Called telephone number
Indicates the telephone number dialed to reach the service
provider for the current call.
Reason for call coming up
Indicates how the call was placed and which workstation
placed the call. Examples are the following:
“Manual Dial by Workstation A.”
“DNS query from Workstation A for
http://www.somedomain.com.”
“Packet from Workstation A to IP address xxxx.”
Understanding Last Call The last call statistics are described in Table 9. These values are cleared each time
Information the LAN Modem is reset or power cycled.
Table 9 Last Call Statistics Description
Last Call Information
Description
Connect Message
Indicates the modem CONNECT message received for the last
call.
Call direction
Indicates whether the last call was incoming or outgoing.
Indicates the destination to which the last call was connected
Indicates the type of call (i.e., PPP).
Service provider name
Data call options
Call start time
Displays the date and time the call began.
The call was up for (seconds)
Number of octets received
Indicates the length of time the last call was connected.
Indicates the number of octets (bytes) received by the Dual
56K LAN Modem.
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CHAPTER 10: TROUBLESHOOTING AND MAINTENANCE
Table 9 Last Call Statistics Description
Last Call Information Description
Number of octets transmitted Indicates the number of octets (bytes) transmitted by the Dual
56K LAN Modem.
Called telephone number
Indicates the telephone number dialed to reach the service
provider for the last call.
Reason for call coming up
Indicates how the call was placed and which workstation
placed the call. Typical entries you may see are:
“Manual Dial by Workstation A.”
“DNS query from Workstation A for http://www.xxx.com.”
“Packet from Workstation A to IP address xxxx.”
Reason for call going down
Indicates why the last call was disconnected. For example, idle
timer expired, or manual disconnect.
Understanding Last The last 10 calls statistics are described in Table 10. These values are cleared each
10 Calls Information time the LAN Modem is reset or power cycled.
Table 10 Last 10 Calls Statistics Description
Last 10 Calls Information
Description
Call Type
Indicates whether the last 10 calls were incoming or
outgoing.
Service Provider
Indicates the destination to which the last 10 calls were
connected
Duration
Indicates the length of time the last 10 calls were connected
Initiation Reason
Indicates the reason that the last 10 calls were initiated.
Typical reasons you may see are:
“Manual Dial by Workstation A.”
“DNS query from Workstation A for http://www.xxx.com.”
“Packet from Workstation A to IP address xxxx.”
Understanding Service The Service Provider statistics described in Table 11 are provided after a call has
Providers Information ended. These values are cleared each time the LAN Modem is reset or power
cycled.
Table 11 Service Provider Statistics Description
Service Provider Information Description
Number of successful
connections
Indicates the total number of successful connections to
each service provider
Number of failed connections
Indicates the total number of unsuccessful connections to
each service provider.
Total number of octets received Indicates the total number of octets (bytes) received by the
Dual 56K LAN Modem.
Total number of octets
transmitted
Indicates the total number of octets (bytes) transmitted by
the Dual 56K LAN Modem.
Total connection time (seconds) Indicates the collective connection time for this particular
service provider
Synchronizing the
LAN Modem Clock
The LAN Modem has an internal Real Time clock which automatically synchronizes
itself to the date and time on your workstation during the initial configuration of
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Synchronizing the LAN Modem Clock 135
the LAN Modem. You can manually synchronize this internal clock to match the
date and time of another attached workstation.
To update the LAN Modem’s Real Time clock:
1 From the LAN Modem Main Configuration Page, click the Advanced button.
2 Click the Maintenance button.
3 Click the Update LAN Modem’s clock button (you may have to scroll down to see
it).
The LAN Modem synchronizes its clock to match the date and time on your
workstation.
The Set Password page opens.
4 Enter your password and click Submit.
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CHAPTER 10: TROUBLESHOOTING AND MAINTENANCE
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NETWORKING PRIMER
A
This chapter provides a description of basic networking concepts and modem
terminology to help you better understand the key functionality of the Dual 56K
LAN Modem.
What is a network?
A network is a set of computers and other devices, such as printers, servers, hubs,
and modems, that are connected together either directly through cabling, or
indirectly through dial-up telephone or other services. The components of a
network can be situated in a single room, a single building, or a contained “local”
geographical area, or they can be dispersed over far distances and a wide
geographical area.
What is a LAN? A LAN (Local Area Network) is a network, or a segment of a larger network, which
has all its components (computers, printers, etc.) located within a contained
geographical area, such as a single office building. By linking computers together
and creating a LAN, users can share files and share access to devices such as
printers, common servers, or, in the case of the LAN Modem, to modems for
access to the Internet.
A LAN is defined in contrast to its counterpart, the WAN (Wide Area Network),
and often refers to that portion of a larger network which relies only on direct
cabling to connect all its devices, without crossing into the domain of the WAN,
which consists of any pre-installed telephone or cable wiring, or any pre-existing
public network infrastructures such as the Internet. A network as a whole can
extend beyond the limits of any one LAN and can comprise limitless numbers of
LANs, but where its reach is extended through the use of dial-up or leased-line
services, its LAN-segment is said to end, and the network is said to cross over into
the WAN space.
To link devices together to form a LAN, the type of cabling generally used is
Ethernet. There are three main types of Ethernet networks: 10BASE-T, 10BASE-2
and 10BASE-5. The Dual 56K LAN Modem uses 10BASE-T Ethernet cabling.
10BASE-T Ethernet is used in small networks with only a few dozen devices
located within close proximity to one another. The physical wiring used for a
10BASE-T Ethernet network is twisted pair cabling. The connector used for
10BASE-T looks similar to the connector used for your telephone connection.
10BASE-5 Ethernet is used in large networks with many devices, where
transmissions occur over distant geographical areas. 10BASE-2 (Thin) Ethernet is
used in smaller networks in which all devices are located relatively close together.
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138
APPENDIX A: NETWORKING PRIMER
10 Mbps Ethernet LAN
More Connected
om
C
3
Figure 69 Example of a LAN
What is a WAN? A WAN (Wide Area Network), often referred to as “the WAN,” is that portion of a
network which involves use of the pre-existing public telephone network and
network infrastructures, such as the public Internet, or long-distance carrier
services such as DSL or cable, for transporting data over long distances and a wide
geographical area. The WAN segment of a network is that segment for which
access is typically subscriber-based—meaning its use is essentially “borrowed,”
through, for instance, dial-up or leased-line accounts. It is the WAN, with its
unlimited reach in terms of distance, which enables two or more LANs located at
far geographical distances to be linked as part of a single network. Whereas a LAN
is limited by the physical limits of its direct cabling, the WAN faces no such limits.
Ultimately, it is this absence of any distance limit to the WAN which gives networks
the potential to have global reach and expanse.
Networks which extend into the WAN require the use of WAN devices, such as
routers, which can link the LAN with the WAN by providing a means of access to
these borrowed services of the WAN, typically, through the device’s ability to make
dial-up calls and connections.
How is a LAN connected You can connect a LAN to the WAN using a device such as a router, which has the
to the WAN? ability to establish a connection out to the WAN and, in some cases, receive
connections in the from the WAN.
Since different WAN services use different physical media and different
technologies for transporting data (for example, cable is different from analog,
which is different from ISDN), a WAN device has to have the proper “interface“
to match the particular type of WAN service that is being utilized. Since a WAN
device must also serve as a link to the LAN, it must have another interface to
match the media and technology used for data transport on the LAN (typically,
Ethernet). Thus, for example, the Dual 56K LAN Modem has Ethernet ports which
serves as its link to the LAN on one side, and analog modem ports which serve as
its link to the analog telephone network on the other.
What is a LAN Modem? A LAN Modem is a hybrid device which combines the dial-up capabilities of a
standard modem with the LAN expansion and sharing capabilities of an Ethernet
hub. Because a computer’s access to the modems in the LAN Modem is achieved
through a 10 Mbps Ethernet connection rather than through a serial (COM) port,
the traditional COM port speed bottleneck associated with serial port-based
modems is eliminated. At the same time, the LAN Modem’s Ethernet hub provides
local networking capability among the attached computers.
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What is a network? 139
What is a POTS POTS stands for “Plain Old Telephone Service” and refers to a basic, analog
connection? telephone connection without any added features or functions. A POTS line is
used to connect analog devices, such as a telephone, fax machine, or your Dual
56K LAN Modem, to the public telephone network.
How do different Once communications devices are physically connected together in a network,
devices communicate they must run some type of standard communications software that allows
with each other? different types of devices to communicate with one another according to
common, or shared, protocols. One of the most popular protocols in use within
networks today for this purpose is the Transmission Control Protocol/Internet
Protocol (TCP/IP).
What is TCP/IP? TCP/IP is a group of standardized communications protocols which has become an
industry standard for allowing devices of differing technologies and vendor origin
to communicate across both LAN and WAN environments. The history of TCP/IP’s
use and increased popularity over the years is tied to its use in the original Internet
and to the Internet’s subsequent growth and expansion.
As its name indicates, TCP/IP has two main components: TCP, which is classified as
a “connection” protocol, and IP, which is known as a “routing” protocol. The two
protocols work in conjunction with one another to transport data across
networks.
IP defines a set of rules for routing data from one location to another, including,
for instance, that data is segmented into specific sized packets (called “IP
packets”); that each packet contains source and destination information; and that
the form of this source and destination information is a 32-bit value—an IP
address—which uniquely identifies each location within the network. (See also IP
Address, below.)
While IP provides rules for routing data, the reliability of the data’s delivery to its
destination is not automatically ensured. This is where TCP plays a role; it works on
an entirely different level to ensure delivery by defining rules for error detection
and correction during transmission, and by initiating the retransmission of IP
packets until their receipt by the other end is confirmed.
To use an analogy, in an overnight delivery service, in which many rules and
procedures are followed to ensure swift and reliable delivery of packages, IP might
cover the rules involving addressing (for example, that a street address, telephone
number, and sender’s information must be included) and packaging (that materials
be sorted into envelopes and boxes of set sizes and weight restriction). TCP, by
contrast, might cover the rules having to do with actual delivery (obtaining a
signature from the recipient, leaving a note if the package is not delivered, etc.)
In actuality, TCP/IP encompasses more than the two protocols which define its
name. Among the software applications which also form part of the suite are the
file transfer protocol (FTP), which allows for the transfer of files between remote
devices, Telnet, which allows for login to a device from a remote location, and the
Simple Mail Transfer Protocol (SMTP) and Post Office Protocol (POP) 3, which
establish rules for e-mail transmission.
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APPENDIX A: NETWORKING PRIMER
What is an IP Address? An IP address is a numeric value of a set form—32 bits, or binary digits of either
one or zero—which is used within a TCP/IP network to uniquely identify the
location of every device within the network for purposes of routing data. Each bit
is in actuality a digital signal representing either a one or zero.
Because of the lengthy form of binary values when written in their binary form,
the convention followed when writing IP addresses is to divide the 32-bit address
string into four sets of eight bits, or four bytes (one byte is generally made up of
eight bits). Each set of eight bits is then separated by a period, and each resulting
binary value is then converted into its decimal equivalent. In this way, for example,
the IP address 11000000101010000000000100000001
. . . becomes 11000000.10101000.00000001.00000001
. . . and is written as 192.168.1.1
Much as a postal address uses several levels of identification to pinpoint an exact
location (country, zip code, state, street), an IP address incorporates two levels of
identification within its 32-bit structure. There is a network number or address,
which identifies the broader level of identification (much like a zip code region),
and a host number or address, which pinpoints the exact location of a device
within the broader network. Specifically, within each set of 32 bits, the first
segment of the bits serves to identify the network on which a device resides, and
the remaining bits identify the location of that device (or host) on that network.
The division between network and host is significant because public (i.e., Internet)
routers only route to the level of the network address. In other words, “network”
in this context has a very specific and circumscribed meaning. Beyond this network
level, it is up to a private organization’s internal routers to pinpoint a host’s exact
location. (This has significance for the use of subnet masks, which are explained
below.) All this might be analogous to the idea that, in a first round of mail
sorting, for efficiency’s sake, mail is sorted only to the level of the zip code,
whereupon a second group of mail sorters starts the process over again at the
next level down.
Although it might be logical to assume that the first sixteen bits of an IP address
identifies the network and the last sixteen the host, this is not necessarily the case.
Rather, although the breakdown always follows the pattern, first part =
network; second part = host, the number of bits used to identify “network vs.
host” varies, depending upon the Class type into which the network falls. A
network’s Class type—Class A, B, or C (Class D and E also exist for special
purposes)—is determined by its size. The establishment of these different classes
of networks has to do with the early history of Internet design planning, but the
end result is that, from largest to smallest, network types are referred to as Class
A, Class B, and Class C.
Within each class, then, a set number of bits identifies the network address, and a
set number identifies the host address. In a Class C network, for example, the first
24 bits identify the network (in actuality, the first three bits are always set to 1-1-0,
and the next 21 identify the network). The final eight bits identify the host.
Because these final eight bits can yield a possible combination of 256 different
binary numbers (28 = 256), the number of host devices that can reside on any one
Class C network is limited to 256 (actually, 254, because the all-0’s and all-1’s are
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What is a network? 141
reserved for other purposes). By contrast, a Class A network’s IP address allocates
eight bits for the network number and 24 bits for the local address, allowing for a
possible combination of 16,777,214 (224-2) local addresses.
To return to the postal analogy, just as a street address refers to the set location or
residence itself and not to the occupant, who may change over time, an IP address
refers to a device’s location and not the device itself. Thus, for example, if a PC is
relocated to another area of the same network, it does not retain the same IP
address.
What is a Subnet Mask? A subnet mask is a pattern of 32 binary digits (ones or zeroes) which is transmitted
alongside an IP address to instruct certain routing devices (namely, internal routers
within private organizations, as opposed to public, Internet routers) to read or
interpret the IP address in an alternate way.
Specifically, a subnet mask instructs a routing device to take the host number
portion of the IP address and further subdivide it into two smaller segments: a
subnet number and an even shorter host number. Where this subdivision occurs
depends upon the pattern of ones vs. zeros in the subnet mask. That is, within the
string of the subnet mask’s 32 bits, the point at which the ones end and the
zeroes begin is the point at which the subdivision is made. The resulting subnet
number is then added to the end of the original network number, such that a
new, longer network number is temporarily derived.
The mechanism of a subnet mask is analogous to a colored lens used in an
optician’s test to blot out one half of a two-toned color pattern in order to reveal a
second, sub-pattern. Just as the colored lense is used to “mask” all of one color,
the string of ones in a subnet mask is used to mask any bit in the IP address that
corresponds to a one in the subnet mask, when the address and mask are
matched up against one another. This idea is illustrated in Figure 70, which shows
a subnet mask in a Class C network.
Subnet Mask Applied to IP Address in a Class C Network
Network
Host
Number
Number
(24 bits)
(8 bits)
IP Address 11000000.10101000.00000001.00000001
(as read by external router)
11111111.11111111.11111111.11100000
11000000.10101000.00000001.00000001
Subnet Mask
IP Address
(as read by internal router,
through "lense" of Subnet Mask)
(New)
(New)
Host
Number
(5 bits)
Subnet
Number
(3 bits)
Network
Number
(27 bits)
Bits "masked"
by ones
Bits left unmasked
by zeroes
are read as part of are read as part of
(New) Network
Number
(New) Host Number
Figure 70 Subnet Masking
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142
APPENDIX A: NETWORKING PRIMER
A private organization’s internal router uses this new breakdown of (longer)
network number and (shorter) host number to route data to subdivided areas, or
subnets, within the broader “network” (as identified by the original network
number). The temporary, longer network number identifies the subnet within the
broader network, and the temporary, shorter host number identifies the exact
location of a host within that subnet.
The subnet mask makes this temporary, alternate reading of the IP address
possible within the bounds of the private organization, while at the same time
public routers continue to read the same IP address (without the subnet mask) to
route data to the broader, network level. In other words, a subnet mask allows a
single IP address to serve double duty.
Why use such a complex mechanism? The complicated answer has to do with the
need to solve IP address space shortage problems caused by limitations of the
original IP Class structures, without compromising the efficiency of the entire
system or disrupting it completely.
Because Internet routers use permanent routing tables to keep track of every
(public) IP address down to the network level, the efficiency of Internet routing
cannot be maintained if these tables have to change and expand constantly. At
the same time, if an organization grows beyond a certain number of hosts
(historically, this has occurred with Class C networks, which have a 254 -host
limit), it must either obtain a second public IP address (which in turn expands the
Internet routing tables and causes them to have to be updated), or it must be able
to extend the use of the IP address it already possesses to accommodate a larger
number of hosts.
Subnetting became a way to allow for the latter, and subnet masks were devised
as a way of accomplishing this within the existing framework, using
already-assigned IP addresses. Since Internet routers only route to the level of
networks, all that goes on with a subnet mask and the new network number
derived through its use remains invisible to an Internet router and does not
impede its speed and efficiency. In addition, if an organization has to restructure
its IP address subnetting scheme internally, this can be done without affecting the
permanent, Internet routing tables.
When a pattern of eight bit of all-one’s is converted to its decimal equivalent, the
resulting number is 255. A pattern of eight bits of all-zero’s yields 0. This is why
you frequently see subnet masks such as 255.255.255.0.
Dynamic and Static IP IP addresses for public networks must be unique and provided by the Network
Addresses Information Center (NIC). Because of the increasing popularity of the Internet, the
NIC has begun to run out of permanent IP addresses. It has therefore become
common practice to use dynamic IP addresses, which are assigned temporarily and
then reused, instead of static IP addresses which are permanently assigned. For
example, when accessing the Internet, your ISP has a pool of IP addresses it uses to
provide temporary connections to multiple users. Once you disconnect from the
Internet, the IP address you were using is placed back into the pool of addresses
for use by another user.
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What is a network? 143
If your LAN will not connect to the public Internet, you can set up your own
unique (that is, private) IP address numbering. IP addresses for private networks
such as an office LAN must also be unique but only within that LAN.
What is DHCP? Dynamic Host Configuration Protocol is a process that automatically assigns a
unique, temporary IP address to a newly attached computer on an IP network.
What is DNS? The Domain Name System translates the common alphabetic name into the
numeric IP address. For example, www.3com.com is translated to an specific IP
address by DNS. If you do not use the DHCP functionality of the Dual 56K LAN
Modem, you will have to manually configure the following parameters for each
computer on the LAN: IP address, subnet mask, DNS address and default gateway.
What is NAT? Network Address Translation, or NAT—also known as IP address sharing—is a
system of IP address translation that allows multiple users to share a single WAN
connection, such as an Internet connection.
As an example, if you configure the Dual 56K LAN Modem for dial-out access to
the Internet, leaving NAT enabled, when any user on the LAN launches a Web
browser for Internet access, his or her computer’s local (not publicly-routable) IP
address is translated into the (publicly-routable) IP address provided by the ISP for
access. This allows multiple users on your LAN to appear to your ISP as a single
user or single connection.
In the case of a LAN Modem dial-in scenario, in which one LAN Modem is
configured to receive incoming calls and a second LAN Modem is configured for
dial-out access to the first LAN Modem using NAT, NAT allows multiple users
attached to the second LAN Modem to appear as a single user to the first LAN
Modem.
In terms of communication between the workstations on either LAN, the use of
NAT means that workstations on the second, client-side LAN can directly access all
workstations on the server-side LAN, but that, conversely, workstations on the
server-side LAN cannot directly access all workstations on the client-side LAN. This
is because, in effect, the server-side LAN Modem does not “see” that there are
multiple workstations hidden behind the client-side LAN Modem. The translation
of local IP addresses to a publicly-routable IP address only occurs if the client-side
LAN Modem has initiated the call.
You probably do not want to use NAT If your LAN network is static; that is, an IP
address is assigned to your computer by your MIS department or ISP and is
manually configured.
What are numbered and Some networks require an IP address to be assigned to a WAN in addition to the
unnumbered links? LAN(s). If a WAN has an IP address assigned to it, it is considered a numbered link.
If there is not an IP address assigned to a WAN, it is considered to be an
unnumbered link.
How is overall The performance of all linked devices must be considered to determine
throughput determined? end-to-end throughput. Connection performance is affected by each device in the
chain. Therefore, the slowest link in the chain determines the maximum
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144
APPENDIX A: NETWORKING PRIMER
throughput. On the LAN side, computers on a typical network can communicate
with each other at up to 10 Mbps. When dialing up to a long distance location
using 56K, you can establish a network connection speed of up to 56 Kbps
without compression or up to 115.2 Kbps with compression. If you are dialing
into the Internet, the speed of the router providing access must also be
considered. In addition, the Internet itself may have speed limitations.
What is a modem? The word “modem” is derived from the combination of two words:
modulator/demodulator. The main function of a modem is to convert the analog
signal of the telephone line into the digital signal required by your computer.
What is the difference Digital information is processed according to two finite states, expressed as either
between analog and ON or OFF. Digital signals are therefore often referred to as binary. Most telephone
digital signals? lines, however, are analog, meaning that their signals are continuously varied
along fluctuating rates and values. Before the advent of online services, the
primary use for the telephone network was for transferring voice traffic,
accomplished by converting the spoken voice into an electric signal of varying
frequencies. Therefore, in order for your computer to understand the incoming
analog data, a translation must take place; this is essentially the task of a modem.
What is error correction? Error correction is a method by which modems verify the integrity of the data they
are receiving. If an error is found, the corrupted or damaged packet of
information, referred to as a frame, is resent. While this may impose a delay on the
transmission speed, the data across the connection will be nearly 100% error-free.
The current error correction standard is known as V.42. It is the most common
error correction protocol in use today.
What is Data Data compression is a method of reducing the amount of bandwidth required
Compression? when transmitting a file over a network. This is accomplished by condensing any
duplicate characters into a more compact form. For example, the series of
numbers 0101 0101 0101 0101 0101 0101 0101 may be more simply expressed
as “8 times 0101”. Two common compression protocols are MNP-5 and V. 42bis.
Note that employing data compression upon pre-compressed files, such as a ZIP
archive, may actually increase the time required for file transmission. As such,
V.42bis is preferable in these circumstances, as it is capable of recognizing
pre-compressed files and withholding additional, unnecessary compression.
How does 56K The V.90 56K ITU standard allows modems to receive data at up to 56 Kbps over
technology work? the standard, public switched telephone network (PSTN). V.90 technology
overcomes the theoretical limitations imposed on previous analog modems by
exploiting the digital connections that most Internet and on-line service providers
use at their end to connect to the PSTN, such as a T1 or an ISDN BRI line.
Typically, the only analog portion of the PSTN is the phone line that connects your
home to the telephone company’s central office (CO). Over the past two decades,
the telephone companies have been replacing portions of their original analog
networks with digital circuits. However, the connection from your home to the CO
will likely remain analog for some years to come.
V.90 technology takes advantage of the typical network configuration found
when an analog modem (such as your Dual 56K LAN Modem) accesses a digitally
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What is a network? 145
connected ISP. By bypassing the analog-to-digital conversion in the downstream
path, 56K technology can use nearly all of the available 64K network bandwidth.
(Upstream data, typically less sensitive, travels at the standard V.34 rate of 33.6K.)
Based on “encoding” rather than “modulation”, the result is download speeds
once thought not possible. Older, V.34 modems treat the PSTN as if it were entirely
analog; they therefore cannot take advantage of the bandwidth made available
when one end of the connection--that of your ISP, for instance--is completely
digital.
Possible Limitations
Note that several factors may affect your Dual 56K LAN Modem’s performance.
Current FCC rules limit download speeds to 53 Kbps. Poor line conditions or heavy
traffic may impact performance, just as with older V.34 modems. In real
applications, speeds typically range from the 40s to the low 50s (Kbps), with the
average in the mid-to upper 40s.There are cases where performance is in the 30s,
and others where true V.90 performance may not be possible. Note that both your
phone line as well as your service provider must be V.90 capable; this means that
your service provider must conform to the V.90 standard. Lastly, V.90 requires that
there be no more than one analog-to-digital conversion in the downstream path;
PBX devices, such as those found in corporate telephone systems or some hotels,
may introduce additional conversions.
For assistance with locating an 56K service provider in your area, or for a more
detailed explanation of 56K technology, visit 3Com’s 56K Web page at
http://www.3com.com/56k.
What is a VPN tunnel? A VPN tunnel is a private, secure means by which data that uses any routing
protocol, and which may be content-sensitive, can be transported over the public,
IP-routable-only Internet.
A data packet using any protocol (such as IPX or NetBEUI) can be made secure and
IP-routable through use of the Point-to-Point Tunneling Protocol (PPTP).
Specifically, each data packet is encrypted and encapsulated [behind] an outer,
PPTP header. This encryption and encapsulation allows the data packet to be
transported over the Internet regardless of protocol and without its inner
contents’ being publicly visible—hence, the concept of a private tunnel through
the public Internet.
Once a tunnel server on the private network receives the encapsulated packet on
the other side of the WAN, it discards the outer shell and routes the inner packet
on to its destination, according to the routing protocols used inside.
The LAN Modem allows for the transparent passage of VPN tunnel data from a
computer on its LAN side to its WAN side through its support of the PPTP protocol.
The LAN Modem cannot, however, initiate or terminate a tunnel.
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APPENDIX A: NETWORKING PRIMER
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INSTALLING AND USING THE VIRTUAL
FAX MODEM
B
This appendix describes the installation of the Virtual FAX Modem application
(included on the OfficeConnect Dual 56K LAN Modem Companion Programs
CD-ROM) for use with your Dual 56K LAN Modem.
The Virtual FAX Modem application allows Windows 95, 98, NT 4.0, and 2000
users to use the LAN Modem as if it were directly connected to your computer’s
COM port. This permits direct connections to online services such as America
Online (version 4.0 and later), as well as the sending of Class 2.0 faxes from an
attached Windows computer. The Virtual Fax Modem application must be
installed on each workstation that requires use of the application.
Although both modems can be used at the same time to create two Virtual FAX
Modem connections, each connection can support only one user at a time. In
other words, a Virtual FAX Modem connection cannot be shared.
Installing the Virtual
FAX Modem
Installing the Virtual FAX Modem requires the following three steps:
I
I
I
Installing the Virtual Fax To install the Virtual Fax Modem application, follow these steps:
Modem Application
1 From the OfficeConnect Dual 56K LAN Modem Companion Programs CD-ROM,
double-click the Virtual Fax Modem application.
2 Follow the on-screen instructions to install the application.
Once installed, the Installation Completed screen opens.
3 Click Finish to complete the installation.
The Select Ports screen opens. For use with the LAN Modem, it is recommended to
use any port higher than 4.
4 For this example, select COM 5 and click OK.
The Virtual Fax Modem application updates your computer’s COM ports. Once
complete, you are prompted to restart your computer.
Windows NT and 2000 users may not be prompted to reboot. In this case
5 Click Reboot Now.
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148
APPENDIX B: INSTALLING AND USING THE VIRTUAL FAX MODEM
After your computer has been rebooted, the Virtual Fax Modem icon will be
placed in the lower right corner of the Windows desktop.
The Presets field located in the Virtual Fax Modem application has been
pre-selected for use with the LAN Modem and should be left set to its default
value.
The next step is to install the LAN Modem Virtual COM port driver into the
Windows operating system.
Installing the LAN Once you have installed the Virtual Fax Modem application, you must install the
Modem COM Port Driver COM port driver on each computer that will use a Virtual Fax Modem.
Once your computer has rebooted (as a result of Step 5 from the previous section
1 Click Install Modems.
The Modem Properties window opens.
Windows 2000 users will see the Phone and Modem Options screen.
2 Click Add to add the new modem.
If installing on a laptop computer with a PCMCIA card, you may prompted to
choose the type of modem you want to install. In this case, choose Other and then
click Next.
3 Click Don't detect my modem; I will select it from a list, and then click Next.
4 Select 3Com Corp from the Manufacturer’s list on the left.
5 Select OC Dual 56K LAN Fax Modem from the Models list on the right and click
Next.
6 Select the virtual port which you previously designated in the Select Ports screen
(COM 5, in this example) and click Next.
Windows installs the new modem.
Windows 2000 users may be prompted by the Digital Signature Not Found screen.
In this case click Yes to continue.
7 Click Finish to complete the modem installation.
8 Click Continue on the Install Modems screen.
9 Click Close to close the Modem Properties screen
This completes the LAN Modem COM port driver installation.
The final step is to configure the LAN Modem to further define the manner in
which the Virtual Fax Modem operates.
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Installing the Virtual FAX Modem 149
Configuring the LAN Once you have installed the Virtual Fax Modem application and the LAN Modem
Modem for use with the COM port driver, you can further define the manner in which the Virtual Fax
Virtual Fax Modem Modem interacts with the LAN Modem. This is done via the Virtual Fax Modem
Parameters page.
To access the Virtual Fax Modem Parameters page, do the following.
1 From the LAN Modem main page, click the Advanced button.
The Advanced submenu opens.
2 Click the Virtual Fax Modem button.
Figure 71 Virtual Fax Modem Parameters Page
The following options are provided.
I
Enabled: Check this box to enable or disable the Virtual Fax Modem. By default
this field is set to Enabled.
I
Time Limit: This field is used to set the maximum time available for a Virtual Fax
Modem connection. Once this time limit has been reached, the connection will
be automatically dropped. Note that when the Virtual Fax Modem connection
is in use, no other calls can be placed or received on that telephone line. To
disable this feature, leave this field set the default value of 0. In this case,
Virtual Fax Modem calls will be dropped when the application using the
connection is terminated, or by manually disconnecting the call via the LAN
Modem’s Manual Call Control page.
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APPENDIX B: INSTALLING AND USING THE VIRTUAL FAX MODEM
I
Telephone Line: This field is used to assign the phone line to be used by the
Virtual Fax Modem. By default, this field is set to Any, permitting the use of the
first available line. To always use telephone line 1 choose One. To always use
telephone line 2 choose Two.
4 Click Submit.
This completes the installation and setup of the Virtual Fax Modem. Windows
applications can now access the Virtual Fax Modem for sending Class 2.0 faxes,
connecting to AOL, as well as for other COM Port-based modem applications.
Note that a connection established with Virtual Fax Modem cannot be shared.
Only one user at a time can access the Virtual Fax Modem.
Complete documentation, along with the application itself may be found on the
3Com Companion Programs CD-ROM, or downloaded directly from the LAN
Modem website at:
The Virtual Fax Modem supports Class 2.0 fax communications only. Class 1 or
Class 2 fax applications are not compatible for sending faxes with the Virtual Fax
Modem. Make sure that any fax application you use is set for Class 2.0 (note that
Class 2 and Class 2.0 are not the same). An example of a fax application that
supports Class 2.0 fax communications is provided on the 3Com Companion
Programs CD-ROM, or downloaded directly from the LAN Modem Utilities Web
site: http://www.3com.com/support/docslanmodem.
Monitoring Virtual FAX You can monitor Virtual FAX Modem parameters on a call-by-call basis. You can
Modem Parameters and manually disconnect a virtual fax modem call as well.
Usage
The following parameters are accessible via the LAN Modem’s Manual Call Control
page.
I
I
Name or IP address of the computer originating Virtual FAX Modem access
The Modem number which is making the virtual fax call
In addition, you can manually hang up a virtual fax modem call. To terminate a
Virtual Fax Modem session, do the following.
1 Access the Manual Call Control Page.
2 Locate the Virtual Fax Modem call in the active call box.
3 Click Hangup Call to terminate the call.
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CREATING A VIRTUAL PRIVATE
NETWORK (VPN) TUNNEL
C
This appendix tells you how to create a VPN tunnel from a client workstation,
using the appropriate client software.
Creating a Virtual
Private Network (VPN)
Tunnel
The Dual 56K LAN Modem’s support of the PPTP protocol allows you to establish a
Virtual Private Network tunnel between a workstation attached to the LAN
Modem and a remote private network LAN. In order to establish the tunnel,
however, you must have the appropriate client software installed on your
workstation, and a tunnel server must be in place on the remote LAN. The LAN
Modem cannot initiate or terminate a VPN tunnel.
Since the LAN Modem does not terminate the VPN tunnel, multiple tunnels can be
supported at the same time through a single ISP connection.
Before You Begin Before you can initiate a VPN tunnel to a remote private network, you (or a
network administrator) must already have done the following:
I
On the Remote Private Network (“Server”) Side:
I
Set up a PPTP tunnel server (often called a tunnel “terminator”) on the
remote private network. Examples would be a Windows NT server, version
4.0 or later, with Service Pack 3 or greater and RAS (Remote Access Service)
installed; or 3Com’s NETBuilder, PathBuilder, or Total Control Hub.
I
Installed any networking protocols required for the private network on the
PPTP tunnel server (such as IP, IPX, and NetBeui).
I
On the LAN Modem (“Client”) Side:
I
Configured an Internet Service Provider profile for access to the Internet in
the LAN Modem
I
Installed PPTP tunnel client software on each workstation that will initiate a
VPN tunnel to the private network. Examples of client tunnel software
include:
I
I
I
For Windows 95/98: Windows Dial-Up Networking version 1.3 or
higher (these include the required software VPN adapter)
For Windows NT/2000: Windows NT Operating System with Service
Pack 3
For Macintosh: Network TeleSystem’s TunnelBuilder™ VPN software
I
Installed any network protocols required for the private network on each
workstation that will establish a VPN tunnel.
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152
APPENDIX C: CREATING A VIRTUAL PRIVATE NETWORK (VPN) TUNNEL
Initiating the VPN Once the PPTP tunnel server has been set up at the private network and all client
Tunnel workstations that will use a VPN tunnel have been set up with client software,
each user simply initiates a tunnel from his or her workstation.
Because the steps for initiating a tunnel vary according to the client software used,
refer to the documentation provided with your PPTP software for the specific
steps.
When you initiate a tunnel from your workstation, the LAN Modem detects this
attempt and automatically places a call to its first configured ISP. Once the call is
connected, a tunnel is established between your workstation and the tunnel server
at the remote private network. You are ready to access a remote LAN as if you
were connected directly. In addition, once the ISP connection is established, other
users can initiate tunnels from their workstations to the same or a different remote
destination using the open ISP connection.
An Example Using If you are using Windows Dial-Up Networking and wish to establish a tunnel to a
Windows Dial-Up remote private network that has a PPTP tunnel server in place, you can set up a
Networking workstation attached to the LAN Modem to establish a tunnel, as follows:
I
Install the PPTP protocol in your workstation (PPTP is included with Dial-up
Networking 1.3, which is included on the Companion Programs CD-ROM.
Refer to your Windows user documentation for installation details.)
I
Create a RAS (NT) or Dial-Up Networking (95/98/2000) phone book entry
for the Virtual Private Network. You will need the following information:
I
IP address of the PPTP server into which your ISP will dial
I
A Password to access the remote private network (assigned by a
network administrator)
A RAS phone book entry is similar to other phone book entries, except that you
use an IP address in the Phone number field.
To initiate the tunnel from your workstation, simply double-click the phone book
entry for the VPN.
4 Run Dial-Up Networking
5 Click the Make a New Connection icon.
6 Enter a name for the VPN connection, and, from the drop-down list, select
Microsoft VPN Adapter.
7 Enter the IP address of the PPTP server into which your ISP will dial.
8 Enter your Password.
9 Click Next, and then Finish.
10 To initiate the tunnel, double-click the icon for the VPN entry.
Refer to http://www.com.com/support/docs/lanmodem for more information. For
specific instructions on how to configure a VPN adapter in Windows 98, 95, 2000
or Windows NT, refer to Microsoft’s Web site at http://www.microsoft.com. and
then enter PPTP in the search field.
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FACTORY DEFAULTS
D
This appendix lists the factory default settings of the Dual 56K LAN Modem.
Dual 56K LAN Modem
Factory Defaults
Table 12 Dual 56K LAN Modem Factory Defaults
LAN Parameters
LAN Modem IP Address
Subnet Mask
192.168.1.1
255.255.255.224
Enabled
DHCP Server
NetBIOS Filtering
Always Block
No
Use Data Compression
Use NAT
Yes
Data Call Timeout Values
Minimum Call Duration
2 minutes
7 minutes
Automatic Data Call
Inactivity Disconnect
Manual Data Call Inactivity 15 minutes
Disconnect
Receiving Call Parameters
Auto Answer
Disabled
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154
APPENDIX D: FACTORY DEFAULTS
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SPECIFICATIONS
E
This appendix describes the specifications of the Dual 56K LAN Modem.
I
Year 2000 Compliance
Specifications
Table 13 Dual 56K LAN Modem Specifications
WAN Interface
Analog (POTS) telephone service provided by the
telephone company
RJ-11
WAN (Analog) Connectors
LAN Interface
Ethernet IEEE 802.3 10BASE-T standard
Physical Dimensions
Depth
7.3 in (185.4 mm)
8.7 in (220 mm)
2.15 in (54.6 mm)
2.2 lbs. (1000 g)
Width
Height
Weight
Environmental Operating
Range
Operating temperature
Relative humidity
50˚ to 104˚F (10˚ to 40˚C)
Up to 90% noncondensing
Power
Input
100-240V (0.8A)*
12V (1.5A)
Output
236,657 hours (at 30˚C)
MTBF
* You must use the power supply provided with your Dual 56K LAN Modem.
Year 2000 Compliance
The OfficeConnect LAN Modem is Year 2000 compliant. Specifically, its system
clock is capable of accepting and storing dates including and beyond the year
2000. For information on Year 2000 compliance and 3Com products, visit the
3Com Year 2000 web page: http://www.3com.com/products/yr2000.html.
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156
APPENDIX E: SPECIFICATIONS
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GLOSSARY
analog signals A variety of signals and wavelengths that can be transmitted over communications
lines. An example is a voice call over the phone line.
BACP/BAP Bandwidth Allocation Control Protocol (BACP) and Bandwidth Allocation Protocol
(BAP) are used in conjunction with the Multilink PPP feature. When Multilink PPP is
negotiated, the BACP negotiates with the peer equipment to determine whether
the peer supports BAP. If the peer supports BAP and agrees to use BAP, then the
BAP negotiates the addition and removal of the second modem channel with the
peer equipment based on a user-defined threshold. A key advantage of BACP/BAP
is that it provides a higher probability of establishing a Multilink PPP call during
high traffic conditions by providing a specific telephone number for the second
modem channel to call.
baud rate A term used to measure the speed of an analog transmission from one point to
another. Although not technically accurate, baud rate is commonly used
synonymously with bit rate.
bit rate Also referred to as transmission rate. The number of binary digits (or bits)
transmitted per second (bps). Communications channels using telephone channel
modems are established at set bit rates, commonly 28,800, 56,000, or higher.
central office (CO) The facility at which individual telephone lines in a limited geographic area are
connected to the public telephone network.
client-server :A networking architecture that makes use of distributed intelligence by exploiting
the processing power of all attached computers on the network. A client device is
usually a personal computer—often termed workstation in this context—and the
server is often a high-speed computer. The term client/server is generally used in
contrast to its counterpart, peer-to-peer, which applies to a network environment
in which all devices are able to serve equally as both client and server, and in which
there is no comparable division of function and hierarchy.
In the context of the LAN Modem’s dial-in scenarios, client-side is used to refer to
the LAN Modem or other device (and/or its associated LAN) that initiates a dial-out
call to the LAN Modem that receives the call.
CHAP Challenge Handshake Authentication Protocol. CHAP is one of two PPP
authentication protocols; PAP is the other. An authentication protocol requests
information to verify a valid user. CHAP is a stronger authentication method
because it uses encryption and may repeatedly request user verification at any
time after link establishment.
compression Compression is a method of reducing the size of data packets without losing any
information. If you desire, the 56K modem can automatically compress data for
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158
GLOSSARY
PPP calls to improve data transfer times using a compression method called hi/fn
LZS.
DBA Dynamic Bandwidth Allocation. DBA is a method of reallocating bandwidth (such
as a second modem channel) automatically. DBA allows you to place a voice call
while a Multilink PPP call is active.
default Value set at the factory.
DHCP Dynamic Host Configuration Protocol. DHCP allows a server to automatically
assign an IP address to a newly-attached computer on an IP network.
DNS Domain Name System. A standard or set of rules used with network routing, by
which an alphabetic name, such as Oscar’s_PC, is translated into a numeric IP
address equivalent. DNS name-to-IP address resolution is usually handled by a
specified DNS server located on the network. In the case of the LAN Modem and
its attached LAN, the LAN Modem acts as the default DNS server for the LAN.
Domain A domain is a unique name which refers to a single device on the Internet and is
used for organizational purposes.
error control Various techniques that check the reliability of characters or blocks of data.
firmware Firmware is the code which resides in your Dual 56K LAN Modem and controls its
behavior. It differs from software in the form of programs that run on your
computer.
FTP File Transfer Protocol. The protocol invoked when uploading or downloading files
from a remote site via TCP/IP.
hub A hub is a device consisting of ports into which two or more computers and other
devices can be plugged in order allow these devices to communicate with one
another as a local area network (LAN).
ITU International Telecommunications Union. Headquartered in Geneva, Switzerland
the ITU is an international organization within which governments and the private
sector coordinate global telecom networks and services.
IP address An IP address is a set of numbers that uniquely identifies each device in a network.
ISP Internet Service Provider. A business that supplies access to the Internet. Examples
include your telephone company and America Online (AOL).
Kbps Kilobits per second. Kbps is the rate at which data is transmitted between
communications equipment, such as 56K modems.
MS-CHAP Microsoft’s proprietary version of CHAP. See also CHAP.
modem A device that transmits/receives computer data through an analog
communications channel, such as a telephone line. A modem’s essential task is to
convert the analog signals of the telephone line into the digital signals required by
your computer, and vice versa.
Multilink PPP The Multilink Point-to-Point Protocol is a protocol used in conjunction with the
Point-to-Point Protocol (PPP) to combine two or more PPP connections into a
single, high-bandwidth connection or channel. In the case of the Dual 56K LAN
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GLOSSARY
159
Modem’s two 56K lines, Multilink PPP is used to combine these two 56K
connections into a virtual, single 112K connection.
NetBIOS filtering NetBIOS filtering is a LAN Modem feature that helps prevent the LAN Modem
from establishing unwanted calls. This feature filters the DNS requests made by
NetBIOS that inadvertently cause the LAN Modem to place a call. NetBIOS is a
protocol primarily used by Windows 98, 95 and NT for local file and printer
sharing.
off hook/on hook Modem operations that are the equivalent of manually lifting a phone receiver
(taking it off-hook) and replacing it (going on-hook).
PAP Password Authentication Protocol. PAP is one of two PPP authentication protocols;
CHAP is the other. An authentication protocol requests information to verify a
valid user. PAP requests the user’s name and password for verification.
PC/TCP PC/TCP is a PC version of TCP/IP created by FTP software.
POTS Plain old telephone service.
PPP Point-to-Point Protocol. PPP provides a standard method of transmitting data
through the Internet. PPP is used for communication between a computer and an
Internet Service Provider.
PPTP Point-to-Point Tunneling Protocol. PPTP is a protocol that allows for Windows 95
and Windows NT systems to establish a secure connection to a remote, private
network via a locally-dialed ISP account.
router A router is a device that links two or more networks together by forwarding data
packets to their proper destinations according to network addresses contained
within the packet headers. Routers use address tables to perform this function and
are considered “intelligent” in their ability to make decisions about the most
efficient route through which to send each packet. A router often serves as the
link between a LAN and WAN.
Service Provider As used by the Dual 56K LAN Modem, the term Service Provider applies to any
remote dial-out destination. The LAN Modem recognizes two categories of Service
Providers: Internet Service Providers (see also ISP), which provide a direct
connection to the Internet, and Private Network Service Providers, which provide a
direct connection to a remote Private Network, such as a corporate office LAN.
server-side Within a client/server network environment, server refers to the device which
supplies, maintains, and/or processes information or services which are requested
and by other, receiving client devices. In the context of the LAN Modem’s dial-in
scenarios, server-side refers to the LAN Modem that receives the dial-in call from
TCP/IP Transmission Control Protocol/Internet Protocol. TCP/IP is a standardized
communications protocol which allows different types of devices to communicate
with each other over LANs and WANs.
UDP User Datagram Protocol. UDP converts application data messages into packets to
be sent via the Internet Protocol (IP), but does not verify a successful transmission.
In this way, UDP is more efficient that TCP, leaving the reliability on the application
that generates the message.
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160
GLOSSARY
V.34 An ITU standard that currently allows data rates as high as 28,800 bps.
V.34+ An enhancement to V.34 that enables transfer rates as high as 33, 600 bps.
V.90 V.90 is the ITU standard which allows modems to receive data at up to 56Kbps
over the standard, public switched telephone network (PSTN). V.90 technology
exploits the digital connections that most Internet and on-line service providers
use at their end to connect to the PSTN, such as a T1 or an ISDN BRI line.
VPN A virtual private network is a secure, private data network that is established over
the Internet, resulting in cost savings by using local, toll free access numbers. Also,
because the existing Internet backbone is used, there is less investment needed in
private network infrastructure.
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3Com Corporation LIMITED LIFETIME WARRANTY
OfficeConnect Dual 56K LAN Modem
HARDWARE
3Com warrants this hardware product to be free from defects in workmanship and materials, under normal
use and service, for the following length of time from the date of purchase from 3Com or its authorized
reseller:
Lifetime, except that the fan and power supply hardware (if any) are warranted for one (1) year
3Com’s sole obligation under this express warranty shall be, at 3Com’s option and expense, to repair the
defective product or part, deliver to Customer an equivalent product or part to replace the defective item, or
if neither of the two foregoing options is reasonably available, 3Com may, in its sole discretion, refund to
Customer the purchase price paid for the defective product. All products that are replaced will become the
property of 3Com. Replacement products may be new or reconditioned. 3Com warrants any replaced or
repaired product or part for ninety (90) days from shipment, or the remainder of the initial warranty period,
whichever is longer.
SOFTWARE
3Com warrants to Customer that each software program licensed from it will perform in substantial
conformance to its program specifications, for a period of ninety (90) days from the date of purchase from
3Com or its authorized reseller. 3Com warrants the media containing software against failure during the
warranty period. No updates are provided. 3Com's sole obligation under this express warranty shall be, at
3Com's option and expense, to refund the purchase price paid by Customer for any defective software
product, or to replace any defective media with software which substantially conforms to applicable 3Com
published specifications. Customer assumes responsibility for the selection of the appropriate applications
program and associated reference materials. 3Com makes no warranty or representation that its software
products will meet Customer’s requirements or work in combination with any hardware or applications
software products provided by third parties, that the operation of the software products will be
uninterrupted or error free, or that all defects in the software products will be corrected. For any third party
products listed in the 3Com software product documentation or specifications as being compatible, 3Com
will make reasonable efforts to provide compatibility, except where the non-compatibility is caused by a
"bug" or defect in the third party's product or from use of the software product not in accordance with
3Com’s published specifications or user manual.
THIS 3COM PRODUCT MAY INCLUDE OR BE BUNDLED WITH THIRD PARTY SOFTWARE, THE USE OF WHICH
IS GOVERNED BY A SEPARATE END USER LICENSE AGREEMENT. THIS 3COM WARRANTY DOES NOT APPLY
TO SUCH THIRD PARTY SOFTWARE. FOR THE APPLICABLE WARRANTY, PLEASE REFER TO THE END USER
LICENSE AGREEMENT GOVERNING THE USE OF SUCH SOFTWARE.
YEAR 2000 WARRANTY
In addition to the Hardware Warranty and Software Warranty stated above, 3Com warrants that each
product sold or licensed to Customer on and after January 1, 1998 that is date sensitive will continue
performing properly with regard to such date data on and after January 1, 2000, provided that all other
products used by Customer in connection or combination with the 3Com product, including hardware,
software, and firmware, accurately exchange date data with the 3Com product, with the exception of those
products identified at 3Com’s Web site, http://www.3com.com/products/yr2000.html, as not meeting this
standard. If it appears that any product that is stated to meet this standard does not perform properly with
regard to such date data on and after January 1, 2000, and Customer notifies 3Com before the later of April
1, 2000, or ninety (90) days after purchase of the product from 3Com or its authorized reseller, 3Com shall,
at its option and expense, provide a software update which would effect the proper performance of such
product, repair such product, deliver to Customer an equivalent product to replace such product, or if none
of the foregoing is feasible, refund to Customer the purchase price paid for such product.
Any software update or replaced or repaired product will carry a Year 2000 Warranty for ninety (90) days
after purchase or until April 1, 2000, whichever is later.
OBTAINING WARRANTY
SERVICE
Customer must contact a 3Com Corporate Service Center or an Authorized 3Com Service Center within the
applicable warranty period to obtain warranty service authorization. Dated proof of purchase from 3Com or
its authorized reseller may be required. Products returned to 3Com's Corporate Service Center must be
pre-authorized by 3Com with a Return Material Authorization (RMA) number marked on the outside of the
package, and sent prepaid and packaged appropriately for safe shipment, and it is recommended that they
be insured or sent by a method that provides for tracking of the package. The repaired or replaced item will
be shipped to Customer, at 3Com's expense, not later than thirty (30) days after 3Com receives the defective
product.
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Dead- or Defective-on-Arrival. In the event a product completely fails to function or exhibits a defect in
materials or workmanship within the first forty-eight (48) hours of installation but no later than thirty (30)
days after the date of purchase, and this is verified by 3Com, it will be considered dead- or
defective-on-arrival (DOA) and a replacement shall be provided by advance replacement. The replacement
product will normally be shipped not later than three (3) business days after 3Com’s verification of the DOA
product, but may be delayed due to export or import procedures. When an advance replacement is provided
and Customer fails to return the original product to 3Com within fifteen (15) days after shipment of the
replacement, 3Com will charge Customer for the replacement product, at list price.
3Com shall not be responsible for any software, firmware, information, or memory data of Customer
contained in, stored on, or integrated with any products returned to 3Com for repair, whether under
warranty or not.
WARRANTIES EXCLUSIVE
IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, CUSTOMER'S SOLE REMEDY FOR
BREACH OF THAT WARRANTY SHALL BE REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE
PAID, AT 3COM'S OPTION. TO THE FULL EXTENT ALLOWED BY LAW, THE FOREGOING WARRANTIES AND
REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES, TERMS, OR CONDITIONS,
EXPRESS OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, STATUTORY OR OTHERWISE, INCLUDING
WARRANTIES, TERMS, OR CONDITIONS OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
SATISFACTORY QUALITY, CORRESPONDENCE WITH DESCRIPTION, AND NON-INFRINGEMENT, ALL OF
WHICH ARE EXPRESSLY DISCLAIMED. 3COM NEITHER ASSUMES NOR AUTHORIZES ANY OTHER PERSON TO
ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE OR
USE OF ITS PRODUCTS.
3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION DISCLOSE THAT
THE ALLEGED DEFECT OR MALFUNCTION IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY
CUSTOMER'S OR ANY THIRD PERSON'S MISUSE, NEGLECT, IMPROPER INSTALLATION OR TESTING,
UNAUTHORIZED ATTEMPTS TO OPEN, REPAIR OR MODIFY THE PRODUCT, OR ANY OTHER CAUSE BEYOND
THE RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE, LIGHTNING, POWER CUTS OR OUTAGES,
OTHER HAZARDS, OR ACTS OF GOD.
LIMITATION OF LIABILITY
TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO EXCLUDES FOR ITSELF AND ITS SUPPLIERS ANY
LIABILITY, WHETHER BASED IN CONTRACT OR TORT (INCLUDING NEGLIGENCE), FOR INCIDENTAL,
CONSEQUENTIAL, INDIRECT, SPECIAL, OR PUNITIVE DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE OR
PROFITS, LOSS OF BUSINESS, LOSS OF INFORMATION OR DATA, OR OTHER FINANCIAL LOSS ARISING OUT
OF OR IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE, USE, PERFORMANCE, FAILURE, OR
INTERRUPTION OF ITS PRODUCTS, EVEN IF 3COM OR ITS AUTHORIZED RESELLER HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES, AND LIMITS ITS LIABILITY TO REPAIR, REPLACEMENT, OR REFUND OF THE
PURCHASE PRICE PAID, AT 3COM'S OPTION. THIS DISCLAIMER OF LIABILITY FOR DAMAGES WILL NOT BE
AFFECTED IF ANY REMEDY PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL PURPOSE.
DISCLAIMER
Some countries, states, or provinces do not allow the exclusion or limitation of implied warranties or the
limitation of incidental or consequential damages for certain products supplied to consumers, or the
limitation of liability for personal injury, so the above limitations and exclusions may be limited in their
application to you. When the implied warranties are not allowed to be excluded in their entirety, they will be
limited to the duration of the applicable written warranty. This warranty gives you specific legal rights which
may vary depending on local law.
GOVERNING LAW
This Limited Warranty shall be governed by the laws of the State of California, U.S.A. excluding its conflicts of
laws principles and excluding the United Nations Convention on Contracts for the International Sale of
Goods.
3Com Corporation
5400 Bayfront Plaza
P.O. Box 58145
Santa Clara, CA 95052-8145
(408) 326-5000
March 1, 2000
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REGULATORY AND APROVAL INFORMATION
EUROPEAN UNION
This device complies with the requirements of European Directive 1995/5/EC.
IC (INDUSTRY CANADA)
I
Equipment Jack: CA-11A
This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set
out in the radio interference regulations of Industry Canada (formerly the Canadian Department of
Communications).
Le present appareil numerique n’emet pas de bruits radioelectriques depassant les limites applicables aux
appareils numeriques de la classe A prescrites dans le Reglement sur le brouillage radioelectrique edicte par
l’Industrie Canada (anterieurement le ministre des Communications).
CANADIAN INSTALLATIONS
The Industry Canada (formerly Canadian Department of Communications) label identifies certified
equipment. Certification means that equipment meets certain telecommunications network protective,
operational, and safety requirements. The department does not guarantee the equipment will operate to the
purchaser’s satisfaction.
Before installing this equipment, be sure a connection to a local telecommunications company is permissible.
Install equipment using an acceptable method. Be aware, however, that compliance with these conditions
may not prevent degradation of service in some situations.
Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated
by the supplier. Any repairs or alterations made by a user to this equipment, or equipment malfunctions,
may give the telecommunications company cause to request the user to disconnect the equipment. For
protection, be sure that electrical ground connections of the power utility, telephone lines, and internal
metallic water pipe system, if present, are connected together. This precaution may be particularly important
in rural areas.
Caution: Do not attempt to make such connections; contact the appropriate electrical inspection
authority or electrician.
NEW ZEALAND
Not all phones connected to the phone port will respond to incoming ringing. Do not report this as a fault
unless the same phone will not respond to ringing when connected to a standard phone socket.
This equipment shall not be set up to make automatic calls to the Telecom 111 Emergency Services.
The grant of a Telepermit for a device in no way indicates Telecom acceptance of responsibility for the correct
operation of that device under all operating conditions. In particular, higher speeds at which this modem is
capable of operating depend on a specific network implementation which is only one of many ways of
delivering high quality voice telephony to customers.
Failure to operate should not be reported as a fault to Telecom.
In addition to satisfactory line conditions a modem can only work properly if:
a) it is compatible with the modem at the other end of the call and,
b) the application using the modem is compatible with the application at the other end of the call – e.g.
accessing the Internet requires suitable software in addition to a modem.
This equipment should not be used in a manner which could constitute a nuisance to other Telecom
customers.
Some parameters required for compliance with Telecom’s PTC Specifications are dependent on the
equipment (PC) associated with this modem. The associated equipment shall be set up to operate within the
following limits for compliance with Telecom specifications:
a) There shall be no more than 10 call attempts to the same number within any 30 minute period for a single
manual call initiation
b) The equipment shall go back on-hook for a period of not less than 30 seconds between the end of one call
attempt and the beginning of the next.
c) Automatic calls to different numbers shall be not less than 5 seconds apart.
d) When used in the Auto-Answer mode, the S0 register must be set with a value between 2 and 5. This
ensures:
i. A person calling your modem will hear a short burst of ringing before the modem answers. This confirms
that the call has been successfully switched through the network.
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ii. Caller identification information (which occurs between the first and second ring cadence) is not
destroyed.
This equipment does not meet Telecom’s impedance requirements. Performance limitations may occur when
used in conjunction with some parts of the network. Telecom will accept no responsibility should difficulties
arise in such circumstances.
The code for Call Waiting disable is *52 on the Telecom New Zealand telephone network.
FCC CLASS B STATEMENT
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
1
2
This device may not cause harmful interference, and
This device must accept any interference received, including interference that may cause undesired
operation.
WARNING: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules, and the Canadian Department of Communications Equipment
Standards entitled, “Digital Apparatus,” ICES-003. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
I
I
I
I
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from the one which the receiver is connected to.
Consult the dealer or an experienced radio/TV technician for help.
The user may find the following booklet prepared by the Federal Communications Commission helpful:
The Interference Handbook
This booklet is available from the U.S. Government Printing Office, Washington, D.C. 20402. Stock No.
004-000-00345-4.
NOTE: In order to maintain compliance with the limits of a Class B digital device, 3Com requires that you use
quality interface cables when connecting to this device. Changes or modifications not expressly approved by
3Com could void the user’s authority to operate this equipment. Refer to the manual for specifications on
cabling types.
FCC DECLARATION OF
CONFORMITY
We declare under our sole responsibility that the
Model:
Description:
3C888
OfficeConnect Dual 56K LAN Modem
to which this declaration relates, is in conformity with the following standards or other normative
documents:
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Federal Communications Commission 47 CFR Part 15, subpart B
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3Com Corporation, 5400 Bayfront Plaza, P.O. Box 58145, Santa Clara, CA 95052-8145
FCC PART 68 STATEMENT
3Com Corporation
Model No: 3C888
Made in Ireland
This equipment complies with Part 68 of the FCC Rules. On the bottom of this equipment is a label that
contains, among other information, the FCC 68 registration number and Ringer Equivalence Number (REN)
for this equipment. If requested, this information must be provided to the telephone company.
The REN is used to determine the number of devices you may legally connect to your telephone line. In most
areas, the sum of the REN of all devices connected to one line must not exceed five (5.0). You should contact
your telephone company to determine the maximum REN for your calling area.
Two FCC compliant telephone cords with modular plugs are provided with this equipment. This device
connects to the telephone network via RJ -11 plugs and jacks. The plugs and jacks also comply with FCC part
68 rules. Be sure that the telephone line or lines you are connecting the modem to are standard analog lines
and not digital (PBX), party, or coin telephone lines.
If this device causes harm to the telephone network, the telephone company will notify you in advance that
temporary discontinuance of service may be required. But, if advance notice is not practical, the telephone
company will notify the customer as soon as possible. Also, you will be advised of your right to file a
complaint with the FCC if you believe it is necessary.
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The telephone company may make changes in its facilities, equipment, operations, or procedures that could
effect the operation of the equipment. If this happens, the telephone company will provide advance notice in
order for you to make necessary modifications to maintain uninterrupted service.
If trouble is experienced with this device, for repair and warranty information, please refer to the Technical
Support insert for repair information and the warranty section of this User Guide for warranty information.
In the event of device malfunction, all repairs should be performed by 3Com or an authorized agent. It is the
responsibility of users requiring service to report the need for service to our company or to one of our
authorized agents. In the event service is required, refer to the Technical Support insert for information.
Service can be obtained at:
· 3Com Customer Repair Service
· 353 Betsy Ross Drive
· Santa Clara, CA 95054
If the device is causing harm to the telephone network, the telephone company may request that you
disconnect the equipment until the problem is resolved.This registered device is capable of providing users
access to interstate providers of operator services through the use of equal access codes.
This registered device provides proper answer supervision to the PSTN when DID calls are answered by the
called station, answered by the attendant, routed to a recorded announcement that can be administered by
the CPE user, or routed to a dial prompt and this device returns answer supervision on all DID calls forwarded
to the PSTN. Permissible exceptions are as follows: a call is unanswered, a busy tone is received, a recorded
tone is received.
FCC PART 68 COMPLIANCE
STATEMENT
This equipment complies with Part 68 of the FCC rules concerning:
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FCC Registration Number: labeled on the board
Facility Interface Code: 02LS2
Service Order Code: 9.0F
USOC Jack: RJ11C
REN: 1.0B
The FCC information printed above must be given to the telephone company before installing this product.
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167
manually 122
configuring 87
outgoing calls
preventing 87
A
Dynamic Bandwidth Allocation (DBA)
defined 27
Advanced Dial-in
explained 98
dynamic IP address
Auto Answer
P
password
changing 89
configuring 101
F
Password Authentication Protocol
(PAP) 19
placing calls
automatically 120
manually 120
firmware
B
back panel
description 17
BACP/BAP
defined 27
H
hub
C
call routing
I
R
Callback
installation
receiving calls
data 121
IP address
explained 23
voice 121
remote administration
Challenge Handshake Authentication
changing
configuration
resetting workstation
Macintosh 127
S
service providers
typical 47
defined 22
L
LAN Modem Site-to-Site Dial-in
explained 97
Single User Dial-in
explained 96
spurious calls
suppressing 88
static IP address
support
LAN parameters
configuring 81
understanding 81
LEDs
description 16
monitoring 125
local DNS table
configuring 88
connecting
creating 78
syntax 78
conventions
notice icons, About This Guide 12
text, About This Guide 12
M
manual call
Modem Controls
changing 83
understanding 83
Multilink PPP
multilink PPP
D
T
data call parameters
changing 85
TCP/IP
setup for Windows
95/98/2000/NT 32
TempSvcProvider
troubleshooting
understanding 85
dial-in
configuring dial-in user
parameters 114
understanding 95
Dial-in functionality
defined 25
defined 27
evaluating symptoms and
solutions 126
N
NAT configuration
defined 24
Dial-in Wizard
Advanced 108
Site-to-Site 105
U
UDP
O
disconnecting calls
Outgoing Call Control
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