3com OfficeConnect 3C892A Manuale utente

http://www.3com.com/

®

OfﬁceConnect

®

ISDN LAN Modem

User Guide

Part No. 984/000026-2

Published January 1999

3Com Corporation

5400 Bayfront Plaza

Santa Clara, California

95052-8145

3Com Technologies, 1999.

reproduced in any form or by any means or used to make any derivative work (such as translation,

transformation, or adaptation) without permission from 3Com Technologies.

3Com Technologies reserves the right to revise this documentation and to make changes in content from

time to time without obligation on the part of 3Com Technologies to provide notiﬁcation of such revision or

change.

3Com Technologies provides this documentation without warranty of any kind, either implied or expressed,

including, but not limited to, the implied warranties of merchantability and ﬁtness for a particular purpose.

3Com may make improvements or changes in the product(s) and/or the program(s) described in this

documentation at any time.

UNITED STATES GOVERNMENT LEGENDS:

If you are a United States government agency, then this documentation and the software described herein

are provided to you subject to the following restricted rights:

For units of the Department of Defense:

Restricted Rights Legend:

Use, duplication, or disclosure by the Government is subject to restrictions as set

forth in subparagraph (c) (1) (ii) for Restricted Rights in Technical Data and Computer Software Clause at 48

C.F.R. 52.227-7013. 3Com Corporation, 5400 Bayfront Plaza, Santa Clara, California 95052-8145.

For civilian agencies:

Restricted Rights Legend:

Use, reproduction, or disclosure is subject to restrictions set forth in subparagraph

(a) through (d) of the Commercial Computer Software - Restricted Rights Clause at 48 C.F.R. 52.227-19 and

the limitations set forth in 3Com Corporation’s standard commercial agreement for the software.

Unpublished rights reserved under the copyright laws of the United States.

If there is any software on removable media described in this documentation, it is furnished under a license

agreement included with the product as a separate document, in the hard copy documentation, or on the

removable media in a directory ﬁle named LICENSE.TXT. If you are unable to locate a copy, please contact

3Com and a copy will be provided to you.

Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may

not be registered in other countries.

3Com and OfﬁceConnect are registered trademarks of 3Com Corporation. 3ComFacts is a service mark of

3Com.

Stac and LZS are registered trademarks and Hi/fn is a trademark of Stac, Inc. Pentium is a registered

trademark of Intel. Windows and Windows NT are registered trademarks of Microsoft. Macintosh is a

registered trademark of Apple Computer Corporation. IBM is a registered trademark of International

Business Machines Corporation. TunnelBuilder is a trademark of TeleSystem.

Other brand and product names may be registered trademarks or trademarks of their respective holders.

Guide written by Anne Vigna Stone.

I

MPORTANT

S

AFETY

I

NFORMATION

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:

■

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).

■

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.

■

Port identiﬁed by the label ISDN = TNV.

TNV (Telecoms Network Voltage) is a circuit which, under normal operating conditions, carries

telecommunication signals.

■

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).

■

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.

W

ICHTIGE

S

ICHERHEITS

-I

NFORMATIONEN

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:

■

Lassen Sie bei Installation und Abbau besondere Vorsicht walten.

■

Stellen Sie die Einheit in der Nähe einer Stromquelle auf und achten Sie darauf, daß diese

zugänglich ist.

■

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.

■

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:

■

Schnittstellen mit der Bezeichnung ISDN = TNV. TNV (Telecoms Network Voltage) ist ein

Schaltkreis, auf dem unter normalen Betriebsbedingungen Telekommunikationssignale

übertragen werden.

■

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

ist, daß die Spannung zwischen zwei zugänglichen Bauteilen einen Sicherheitswert nicht

übersteigt (42,2 V Spitzenspannung bzw. 60 V Gleichspannung).

■

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.

I

MPORTANT

N

OTICE

DE

S

ECURITE

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.

■

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).

■

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 :

■

Les ports identiﬁés par les étiquettes ISDN = TNV. Les circuits TNV (Telecoms Network Voltage,

tension du réseau de télécommunications) sont des circuits qui, en condition normale

d'utilisation, transportent les signaux de télécommunication.

■

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.

■

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.

M

EDIDAS

DE

S

EGURIDAD

I

MPORTANTES

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.

■

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.

■

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:

■

Puertos con etiqueta ISDN = TNV.

TNV (Telecoms Network Voltage) es un circuito que, en condiciones normales, transmite

señales de telecomunicación.

■

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.

■

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.

I

NFORMAZIONI

I

MPORTANTI

PER

LA

S

ICUREZZA

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.

■

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).

■

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:

■

Porte contrassegnate dalle targhette ISDN = TNV. TNV (Telecoms Network Voltage) è un

circuito che, in normali condizioni di esercizio, trasmette segnali di telecomunicazione.

■

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).

■

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

■

Only connect apparatus complying with the relevant interface requirements to the ports on

this unit.

■

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.

■

Protect the unit from sudden, transient increases and decreases in electrical power by ﬁtting

an in-line surge suppressor or uninteruptable 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.

■

If any of the following conditions occur, isolate the electricity supply and refer to your 3Com

reseller.

■

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.

■

If the unit shows signs of a distinct change in performance.

■

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.

■

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 telecoms 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.

■

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.

■ 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.

TABLE OF CONTENTS

ABOUT THIS GUIDE

How to Use This Guide 9

Conventions 10

Year 2000 Compliance 10

1 INTRODUCTION

Introduction 11

Applications 11

Local Networking with Access to the Internet 11

Local Networking with Access to a Remote Ofﬁce 12

Local Networking with Access to the Internet and a Remote Ofﬁce 12

Features 13

2 ISDN LAN MODEM FUNCTIONALITY DESCRIPTION

Connection Types 17

WAN Side Connection 17

Two Separate Connections to Different Locations 18

One High Speed Connection to a Single Location 19

LAN Side Connection 20

Application Sharing over the LAN 20

Call Routing Protocol and IP Address Translation 21

Placing a Call to a Previously Deﬁned Destination 21

Call Routing While No Other Calls Are Connected 21

Call Routing While One Call Is Already Connected 22

Understanding Multilink PPP and BACP/BAP 22

What is Multilink PPP? 22

What is BACP/BAP? 22

Multilink PPP Conﬁguration Options 23

Understanding Dynamic Bandwidth Allocation 23

Understanding VPNs and PPTP 23

Setting Up the Server Side of the Tunnel 24

Setting Up the Client Side of the Tunnel 24

For Windows Dial-Up Networking Users 25

Establishing a Tunnel via the ISDN LAN Modem 25

3 HARDWARE DESCRIPTION AND INSTALLATION

Package Contents 27

Before You Install the ISDN LAN Modem 27

IBM PC or Compatible Requirements 28

Apple Macintosh Requirements 28

Front Panel LED Description 28

Back Panel Connector Description 29

Installing the ISDN LAN Modem 30

Before You Begin 30

Installing the ISDN Cable 30

Connecting to a 10BASE-T Ethernet Port 31

Connecting to Another Ethernet Hub 32

Before You Begin 32

Installing Analog Equipment 33

Installing the Power Cable 34

Wall Mounting the ISDN LAN Modem 34

Using Rubber Feet and Stacking Clips 35

4 SETTING UP TCP/IP FOR WINDOWS AND MACINTOSH

TCP/IP Setup Using Windows 98 and Windows 95 37

TCP/IP Setup Using Windows NT 4.0 40

TCP/IP Setup Using Mac OS 7.6 or later 43

TCP/IP Setup Using Windows 3.11 44

Setting Up TCP/IP Using MS TCP 44

5 CONFIGURING THE ISDN LAN MODEM

Typical Conﬁguration 47

Before You Begin 47

You Should Have Done This 47

You Should Have This Information 48

Determine Whether You Use Dynamic or Static IP Addresses 48

Setting Up Your Computer If You Have a Static IP Address 49

For Windows 98 and 95 Users 49

For Windows NT 4.0 Users 49

For Macintosh Users 50

For Windows 3.11 Users 50

Conﬁguring the ISDN LAN Modem for the Typical Conﬁguration 51

Conﬁguring a Static IP Address on the ISDN LAN Modem 55

ISDN LAN Modem Main Page 56

Links from the Illustration 57

Links from the Buttons 57

6 ADVANCED CONFIGURATION

Before you Begin 59

Setting Up Additional Service Providers 60

ISP versus Private Network 60

When to Select ISP 60

When to Select Private Network 61

Setting Up a Connection to an ISP 61

Before You Begin 61

Setting Up a Connection to the Internet 61

Setting Up a Connection to a Private Network 64

Before You Begin 64

Setting Up a Connection to a Remote LAN 64

Associating Service Providers with Workstations on the LAN 67

Editing Service Provider Proﬁles 68

Restricting Workstations from Accessing Service Provider(s) 69

Conﬁguring Your LAN Parameters 69

Understanding LAN Parameters 69

Name 69

IP Address and Subnet Mask 70

Local Domain Name 70

Enable DHCP Server 70

Enable NetBIOS Filtering 70

Conﬁguring the LAN Parameters 71

Changing Data Call Parameters 71

Understanding Data Call Parameters 71

Minimum Call Duration 72

Disconnecting an Automatic Data Call 72

Disconnecting a Manual Data Call 72

Connect/Disconnect Threshold for the Second B Channel 73

Conﬁguring the Data Call Parameters 73

Changing Call Routing 74

Default Setting 74

Changing Call Routing 74

Changing Country Selection 75

Reserving DHCP Addresses 76

Selective Password Protection 76

Changing Your Password 76

Conﬁguring ISDN Line Parameters 77

What is MSN? 77

What is subaddressing? 77

Locking and Unlocking the Conﬁguration 78

Conﬁguring the ISDN LAN Modem from a Remote Location 79

7 SUPPLEMENTARY VOICE CALL SERVICES

Supplementary Voice Services 81

Before You Begin 81

Call Waiting and Call Hold 81

Call Hold 81

How to Use Call Waiting 81

Disconnecting a Call on Hold 82

Calling Line Identiﬁcation Restriction 83

Permanent Conﬁguration 83

Malicious Call Identiﬁcation (MCID) 83

8 PLACING, RECEIVING AND DISCONNECTING CALLS

Placing Calls 85

Placing a Call Automatically 85

Telephone Number Selection for Data Calls 85

Call Routing Among Service Providers 85

Placing a Call Manually 85

Placing a Call Manually to an Existing Service Provider 86

Placing a Call Manually to a Temporary Service Provider 86

Participating in a Temporary Call 87

Placing Multilink PPP Calls 87

Receiving Calls 87

Receiving Data Calls 87

Distinctive Ringing 88

Disconnecting Data Calls 88

Disconnecting Data Calls Manually 88

Disconnecting Calls Automatically Using Timers 89

Minimum Call Duration 89

Idle Timeout 89

Bandwidth on Demand Parameters 89

Connect/Disconnect threshold for the second B channel 89

9 TROUBLESHOOTING AND MAINTENANCE

Checking the Basics 91

Monitoring LEDs 92

Monitoring the ALERT LED 92

Monitoring the ISDN LED 92

Monitoring the

B Channel LEDs 92

Monitoring the LAN Port Status LEDs 92

Troubleshooting Problems Indicated by LEDs 93

Evaluating Symptoms and Solutions 94

Finding More Information 98

Contacting Technical Support 98

Downloading Firmware to Your ISDN LAN Modem 98

Resetting the ISDN LAN Modem 98

Resetting the ISDN Modem Using a Telephone 98

Reviewing Statistics 99

Understanding System Statistics 99

Understanding ISDN Information 100

Understanding Current Call Information 100

Understanding Last Call Information 101

Understanding Service Provider Information 102

A NETWORKING PRIMER

B USING THE CUSTOM BROWSER

C ISDN LAN MODEM FACTORY DEFAULTS

D ISDN LAN MODEM SPECIFICATIONS

Year 2000 Compliance 113

Ring Cadences 114

Tone Deﬁnitions 115

Agency Approvals 124

GLOSSARY

INDEX

WARRANTY

AGENCY APPROVALS

ABOUT THIS GUIDE

About This Guide provides an overview of this guide, describes guide conventions,

and tells you where to look for speciﬁc information.

This guide describes how to install and conﬁgure the OfﬁceConnect ISDN LAN

Modem and provides descriptions of key applications and networking concepts.

These instructions apply to the international version of the product and cover both

hardware versions, ISDN U (3C892) and S/T (3C891).

Audience Description This guide is intended for end users with no presumed level of expertise.

How to Use

This Guide

Table 1 shows where to ﬁnd speciﬁc information in this guide.

Table 1

If you are looking for... Turn to...

An overview of the ISDN LAN Modem Chapter 1

An explanation of the ISDN LAN Modem’s key functionality Chapter 2

A description of the ISDN LAN Modem’s hardware components Chapter 3

Instructions on setting up TCP/IP Chapter 4

Instructions for the typical configuring of the ISDN LAN Modem software Chapter 5

Instructions for advanced configuration of the ISDN LAN Modem software Chapter 6

Information on supplementary voice services Chapter 7

Information on placing, receiving and disconnecting calls Chapter 8

Information on troubleshooting and maintenance Chapter 9

Background information on networking Appendix A

Information on using the custom browser Appendix B

ISDN LAN Modem factory default settings Appendix C

Technical specifications for the ISDN LAN Modem Appendix D

Definition of terms Glossary

10 ABOUT THIS GUIDE

Conventions Table 2 and Table 3 list conventions that are used throughout this guide.

Year 2000 Compliance The OfﬁceConnect ISDN 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

Table 2 Notice Icons

Icon Notice Type Description

Information note Information that describes important features or instructions

Caution Information that alerts you to potential loss of data or potential

damage to an application, system, or device

Warning Information that alerts you to potential personal injury

Table 3 Text Conventions

Convention Description

Screen displays This typeface represents information as it appears on the screen.

Commands The word “command” means that you must enter the command

exactly as shown and then press Return or Enter. Commands appear in

bold. Example:

To remove the IP address, enter the following command:

SETDefault !0 -IP NETaddr = 0.0.0.0

The words “enter”

and “type”

When you see the word “enter” in this guide, you must type

something, and then press Return or Enter. Do not press Return or

Enter when an instruction simply says “type.”

Keyboard key names If you must press two or more keys simultaneously, the key names are

linked with a plus sign (+). Example:

Press Ctrl+Alt+Del

Words in italics Italics are used to:

■ Emphasize a point.

■ Denote a new term at the place where it is defined in the text.

■ Identify menu names, menu commands, and software button

names. Examples:

From the Help menu, select Contents.

Click OK.

1

INTRODUCTION

This chapter provides an overview of the OfﬁceConnect

®

ISDN LAN Modem,

referred to throughout this document as the ISDN LAN Modem. These instructions

apply to the international version of the product and cover both hardware

variations, ISDN U (3C892) and S/T (3C891).

Introduction The ISDN LAN Modem is an easy to install, LAN to WAN modem. For the LAN, it

provides four 10BASE-T Ethernet connections— expandable to 25 connections.

Refer to Figure 1 for an example showing 10 connections by adding an 8-port

10BASE-T Ethernet hub. For WAN access, it provides a Basic Rate Interface (BRI)

ISDN port.

With the ISDN LAN Modem, small ofﬁce and home ofﬁce users can share remote

access to the Internet or to a remote ofﬁce while continuing to network locally.

Applications The primary application for the ISDN LAN Modem is:

■ Local networking with shared access to the Internet and/or a remote ofﬁce

LAN.

Local Networking with

Access to the Internet

Users can share access to the Internet while continuing to network locally.

Figure 1 Local Networking with Access to the Internet

OfficeConnect

®

ISDN LAN Modem

Public telephone

network

Internet/Intranet

or

online service

ISDN BRI line

OfficeConnect™

ISDN LAN Modem

OfficeConnect

®

Hub 8 TPO

Alert

PWR COLLPKT COAX1234

green = link OK, off = link fail, yellow = partition

Port Status

5678

1% 2% 3% 6% 12% 25%50% 80%

Network Utilization

Office

Connect

¤

Hub

3 Com

PWR

ISDN

B1

B2

3 Com

Alert

Tx

Coll

1

2 3 4

LAN STATUS

12 CHAPTER 1: INTRODUCTION

Local Networking with

Access to a Remote

Ofﬁce

Users can share access to a remote ofﬁce LAN while continuing to network locally.

Figure 2 Local Networking with Access to a Remote Ofﬁce

Local Networking with

Access to the Internet

and a Remote Ofﬁce

Users can share access to a remote ofﬁce and the Internet while continuing to

network locally.

Figure 3 Local Networking with Access to a Remote Ofﬁce and the Internet

OfficeConnect

®

ISDN LAN Modem

Public telephone

network

Remote office

LAN

ISDN BRI line

PWR

ISDN

B1

B2

3 Com

Alert

Tx

Coll

1

2 3 4

LAN STATUS

OfficeConnect™

ISDN LAN Modem

OfficeConnect

®

ISDN LAN Modem

Public telephone

network

Remote office

LAN

ISDN BRI line

Internet/Intranet or

online service

PWR

ISDN

B1

B2

3 Com

Alert

Tx

Coll

1

2 3 4

LAN STATUS

OfficeConnect™

ISDN LAN Modem

Features 13

Features Ease of Installation and Use

■ Web-based, point-and-click user interface for conﬁguration and online help.

■ Automatic conﬁguration veriﬁcation with Internet connection through your

Internet Service Provider (ISP).

■ Firmware updates, user guides and technical notes available on the Web.

High Performance

■ Hi/fn™ LZS

®

compression, which conforms to these IETF RFCs: The PPP

Compression Control Protocol (RFC 1962) and PPP Stacker LZS Compression

Protocol (RFC 1974).

■ Multilink PPP (RFC 1990), which combines two PPP B channel calls to create a

virtual, single 128 Kbps network connection.

Connectivity

■ ISDN Basic Rate interface.

■ Up to 25 10BASE-T, 10 Mbps Ethernet connections.

■ Two analog voice ports.

■ Preferred Provider support which allows simultaneous connections to two

different ISPs.

Routing

■ IP Routing.

■ Dynamic or static IP addresses supplied by the ISP (WAN side).

■ WAN access for up to 25 local workstations on the LAN (10BASE-T).

■ Dynamic Host Control Protocol (DHCP) server functionality on the LAN, which

automatically assigns an IP address to a newly-attached computer on an IP

network.

■ Domain Name Service (DNS) server functionality for the LAN, which translates

the common, alphanumeric name of a device to the numeric IP address of a

device .

■ Network Address Translation (NAT) between LAN and WAN, which allows

multiple users on the LAN to share a WAN connection. Note that individual

email accounts may still be maintained at the ISP.

■ Multiplexing trafﬁc from several computers to the same remote destination.

14 CHAPTER 1: INTRODUCTION

Bandwidth Management

■ Automatic call connection.

■ Automatic disconnection of idle calls after a speciﬁed length of time.

■ 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 or receive a

voice or data call while a Multilink PPP call is active.

■ Manual call connection and disconnection.

Remote Management

■ Remote management using the same Web browser interface.

Voice Features

■ Call Waiting

■ Calling Line Identiﬁcation Restriction (CLIR)

■ Malicious Call Identiﬁcation (MCID)

Protocols

■ IETF PPP (RFC 1661, 1662, 1663).

■ IETF Multilink PPP (RFC 1990).

■ PPTP (Point-to-Point Tunneling Protocol— PPTP draft-ietf-pppext-pptp-02.txt).

■ IETF Password Authentication Protocol (PAP) (RFC 1334) and Challenge

Handshake Authentication Protocol (CHAP) security (RFC 1994).

■ 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).

■ IP address negotiation using IPCP (RFC 1332).

■ CCP (RFC 1962, 1974).

■ BACP/BAP (RFC 2125).

■ Network Address Translation between LAN and WAN (RFC 1631).

ISDN Standards and Interface

■ Basic Rate ISDNinterface compatibility with ETSI, BTNR 191, VN3 and NTT

switches.

Security

■ PAP, CHAP and MS_CHAP support on both single-channel and Multilink PPP

calls.

Upgradability

■ Flash memory for ﬁeld ﬁrmware updates.

■ Firmware posted on 3Com’s Web sites.

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3com OfficeConnect 3C892A Manuale utente

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