3COM 520, 530, 510 User Manual

Download

FFICE

510, 520, 530

OTE

NEC

Part No. Published

980/000033

January 1996

/001

SER

Please read the Supplementary Information section of this manual for details of the OfficeConnect 531 model and an EMC Update

UID

3Com Corporation ■

5400 Bayfront Plaza ■

Santa Clara, California ■

95052-8154

© 3Com Sonix Limited, 1996. documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without permission f rom 3 Com 3Com

Sonix r make changes in content from time to time without obligation on the part of change. of any kind, either implied or expressed, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. 3Com 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 fo llowing restri cted rights :

For units of the Department of Defense:

Legend:

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 Wilkinson Road, Cirencester, Gloucestershire, GL7 1YT.

eserves the right to revise this documentation and to

3Com Sonix t

3Com Sonix p

Use, duplication or disclosure by the Government is

Sonix.

o provide notification of such revision or

rovides this documentation without warranty

Sonix m

ay make improvements or

Restricted Rights

. 3Com Sonix Limited, Merchants’ House,

Restricted Rights Legend:

For civilian agencies:

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 Unpublished rights reserved under the copyright laws of the United States.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 me dia in a direc tory file named LICENSE.TXT. If you are unable to locate a copy, please contact 3Com

Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may not be registered in other countries.

3Com, Boundary Routing and Transcend are registered trademarks of 3Com Corporation. Office 3Com Corporation. SmartAgent are service marks of

CompuServe is a registered trademark of CompuS erve, Inc. Castelle is a registered trademark of Castelle Corporation. and NetWare are registered trademarks of Novell Inc. trademark of Microsoft Corporation. VT100 is a registered trademark of Digital Equipment Corporation.

are trademarks of

Sonix a

nd a copy will be provided to you.

3Com Laser Library, 3TECH, CacheCard and

3Com Corporation

3Com Corporation. 3ComFacts

Connect i

Use, reproduction

s a trademark of

and

Novell

Windows is a

Other brand and product na mes may be registered tradema rks or trademarks of their respective holders.

MPORTAN

AFETY INFORMATIO

WARNING:

must follow for your personal safety. Follow all instructions carefully.

Please read carefully and thoroughly the following information before installing the OfficeConnect Remote:

■

Exceptional care must be taken during installation and removal of the unit.

Only stack the OfficeConnect Remote with other

■

Office Only use the power adapter that is supplied with the

■

unit to ensure compliance with international safety standards.

It is essential that the mains socket outlet is located

■

near the unit and is accessible. You can only remove power to the OfficeConnect Remote by disconnecting the power adapter from the unit or from the socket outlet.

The safety status of the interconnection port on this

■

equipment are as follows: Ports identified by the labels VOICE and ISDN = TNV

Warnings contain directions that you

Connect u

nits.

Ports identified by the labels SERIAL, COAX, 10BASET and WAN = SELV

TNV (telecoms network voltage) is a circuit which under normal operating conditions carries telecommunication signals.

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).

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

There are no user-replaceable fuses or user-serviceable

■

parts inside the unit. If you have a physical problem with the unit that cannot be solved with problem solving actions in this guide, contact your supplier.

Disconnect the power adapter before moving the unit.

■

WARNING: Twisted Pair RJ45 data port.

shielded RJ45 data socket. It cannot be used as a telephone socket. Only connect RJ45 data connectors to this socket.

This is a

ICHTIGE

ICHERHEITSHINWEIS

ACHTUNG:

Die Warnungen enthalten Anweisungen,

die Sie zur eigenen Sicherheit zu befolgen haben. Lesen Sie bitte die folgenden Informationen sorgfältig

durch, bevor Sie den OfficeConnect Rem ote einbauen:

besondere Vorsicht muß während des Ein- und Ausbaus

■

Auf

des OfficeConnect Remotes geachtet werden. Stapeln Sie den OfficeConnect Remote nur mit anderen

■

OfficeConnect Einheiten zusammen. Verwenden Sie nur das mit dem OfficeConnect Remote

■

mitgelieferte Netzteil um die internationalen Sicherheitsstandards zu erfüllen.

Die Netzsteckdose muß sich in unmittelbarer Nähe des

■

OfficeConnect Remotes befinden und frei zugänglich sein. Sie können den OfficeConnect Remote nur spannungsfrei schalten, indem Sie das Steckernetzteil aus der Netzsteckdose ziehen oder die Verbindung zum Gerät unterbrechen.

Der Sicherheitsstandard der Anschlüsse fuer dieses Gerät

■

sind wie folgt: Anschlüsse bezeichnet mit VOICE und ISDN = TNV Anschlüsse bezeichnet mit SERIAL, COAX, 10BASET und

WAN = S E LV

TNV (Telecoms Network Voltage - Spannung des Telekommunikationsnetzwerks) ist ein Anschluss, der unter normalen Umständen Telekommunikationssignale enthält .

SELV (Safety Extra Low Voltage - Extra Sicherheitsspannung) ist ein weiterer Anschluss, der unter normalen Umständen und Fehlerkonditionen entworfen und gesichert wurde, so dass die Spannung zwischen zwei erreichbaren Teilen kein gefährliches Niveau erreicht (42.2V max. oder 60 V DC).

An den Anschlussbuchsen der Geräte dürfen nur die dafür vorges

ehenen Anschlüsse verwendet werden.

Es sind keine von dem Benutzer zu ersetzende oder zu

■

wartende Teile in dem Gerät vorhanden. Wenn Sie ein Problem mit dem OfficeConnect Remote haben, das nicht mittels der Fehleranalyse in dieser Anleitung behoben werden kann, setzen Sie sich mit Ihrem Lieferanten in Verbindung.

Bevor der OfficeConnect Remote ausgebaut wird ist das

■

Netzteil zu ziehen.

ACHTUNG: gedrehte paarfache RJ45 Datenanschluss.

Es ist eine abgeschirmte RJ45 Datenanschlußbuchse. Sie darf nicht als Telefonanschluß verwendet werden. Verbinden Sie nur RJ45 Datenstecker mit diesem Anschluss.

L’

INFORMATION D

ÉCURITÉ IMPORTANTE

AVERTISSEMENT:

instructions que vous devez suivre pour votre sécurité personnelle. Suivre toutes les instructions avec soin.

Veuillez lire à fond l’information suivante avant d’installer le moyeu:

■

Le soin exceptionnel doit être pris pendant l’installation et l’enlèvement du moyeu.

■

Seulement entasser le moyeu avec les autres moyeux OfficeConnects.

■

Seulement utiliser la pièce de raccordement d’alimentation qui est fournie avec le moyeu pour assurer la conformité avec les norm es de sécurité internatio nales.

■

C’est essentiel que le socle de prise de courant du réseau soit localisé proche du moyeu et soit accessible. Vous pouvez seulement enlever l’alimentation au moyeu en débranchant la pièce de raccordement d’alimentation de l’unité ou du socle de prise de courant.

■

Les normes de sécurité des ports d'interconnexion sur cet équipement sont les suivants:

Les ports marqués par les etiquettes VOICE et ISD N = TNV Les ports marqués par les etiquettes SERIAL, COAX,

10BASET et WAN = SELV

Les avertissements contiennent les

TNV (Telecoms Network Voltage - tension réseau de télécommunications) est un circuit qui dans des conditions d'opérations normales, transfert les si gneaux télécoms.

SELV (Safety Extra Low Voltage - tension de sécurité extra-réduite) est un circuit secondaire désigné et protègé qui dans des conditions normales et de fautes uniques, assure que la tension entre deux éléments accessibles n'accedéra pas un niveau de sécurité (42.2V max. ou 60 V DC).

Connecter uniquement des unités conformes aux normes relatives des interfaces de cet équipement.

■

Il n’y a pas de parties remplaceables par les utilisateurs ou entretenues par les utilisateurs à l’intérieur du moyeu. Si vous avez un problème physique avec le moyeu qui ne peut pas être résolu avec les actions de la résolution des problèmes dans ce guide, contacter votre fournisseur.

■

Débrancher la pièce de raccordem ent d’alimentation avant de remuer le moyeu.

AVERTISSEMENT: Le port de données RJ45 de paire tordue.

Ceux-ci est un socle de données RJ45 blindé. Il ne peut pas être utilisé comme socle de téléphone. Seulement brancher les connecteurs de données RJ45 à ce socle.

ONTENTS

MPORTAN

ICHTIGE SICHERHEITSHINWEIS

L’

INFORMATION D

BOU

Introduction 1 How to Use This Guide 1 Conventions 2 Additional Safety Information 3

ETTIN

Introduction 1-1

OfficeConnect Remote Features 1-1 Benefits of ISDN 1-3 Pack Contents Checklist 1-4 Registering Ownership Of Your OfficeConnect

Pre-installation Requirements 1-5 OfficeConnect Remote Front and Rear Panel

T SAFETY INFORMATIO

E SÉCURITÉ IMPORTANTE

T THIS GUID

G STARTE

Remote 1-5

Features 1-6

Installation 1-10

Siting

the OfficeConnect Remote 1-10

Using the Rubber Feet and Stacking Clips 1-11

Wall Mounting the OfficeConnect Remote 1-12 C

onnect

ing the Power Adapter 1-12 Connecting to Your 10BaseT LAN 1-13 Connecting to a Single Workstation 1-14 Connecting to Your 10Base2 LAN 1-14 Connecting to ISDN 1-15 Connecting to the W AN 1-16 Connecting to the VOICE Port 1-16 Connecting a Managemen t Term inal 1-16 Location of OfficeConnect Fax and Pr int

Servers 1-16

Quick Configuration 1-17

Starting Quick Configuration 1-17 About Quick Configuration 1-19 Setting the Unit Name 1-20 Connecting to a Novell (IPX) Network 1-21 Connecting to an IP Host on the Same IP

Network 1-22

Connecting to an IP Host on a Different IP

Network 1-23

Connecting to the Internet or a PPP Router 1-25

Monitoring ISDN Line Usage 1-28 Setting Up a WAN Link 1-28 Examples of Typical ISDN Networking Applications 1-30

Novell Network 1-30 IP Host on the Same IP Network 1-31 IP Host on Another IP Network 1-33 Internet or PPP Router 1-34 Multiple Connections from a Single Site 1-35

Troubleshooting 1-36

RIDGING AND ROUTIN

Introduction A-1 Bridging and Routing Concepts A-1

Guidelines For Choosing Bridging or Routing A-2 How Bridges Learn A-2 Bridging Between Remote Sites A-3 Building a Larger Network A-4 Multiple Paths Between Bridged LANs A-5 Network Topology A-6 Broadcast Storms A-6 Optimum Use of Resource A-6 Network Organization, Structure and Physical LayoutA-7 The Internet A-7

Routing IP and IPX A-7

IP Routing A-9 IPX Routing A-11 IP Addresses A-12

Numbered and Unnumbered Links A-15

ECHNICA

Specifications B-1

LAN Connector Interfaces B-1 WAN Connector Interface B-1 ISDN Connector Interface B-1 Voice Connector Interface B-1 Management Connector Interface B-1 Bridge Characteristics B-2 Performance B-2

Approvals B-2

FCC Requirement B-3 Dimensions B-4 Interface Cable Characteristics B-5

WAN Port Connecting Cable – V.11/X.21

WAN Port Connecting Cable – V.24/V.28

WAN Port Connecting Cable – V.35/V.36

Manager Port Connecting Cable B-8

Modem Cable B-9

LAN Port Connecting Cable - 10BaseT B-9 Ordering Information B-10

L INFORMATIO

Support B-5 Support B-6 Support B-7

LOSSARY

ECHNICA

On-line Technical Services D-1

3Com Bulletin Board Service D-1

World Wide Web Site D-2 Support from Your Network Supplier D-2 Support from 3Com D-2 Returning Products for Repair D-3

NDE

L SUPPOR

BOU

HIS

UID

Introduction

This guide describes the features, installation and initial configuration of the OfficeConnect Remote. The guide has been designed to be used by both first-time and experienced computer network users who want to install and use the OfficeConnect Remote. xxx

If you are working with an ISDN bridge or router for the first time, it is possible you may make mistakes. We have tried to identify the likely errors you may make and have provided hints and tips to help you recover from error situations.

Once you have carried out the intial configuration of the unit using the carry out additional configuration to optimize the unit’s performance on your network. Refer to the

Software Refe rence

Quick Configuration

guide for more details.

option you can

How to Use This Guide

This table shows where to find specific information:

If you are looking for information on:

About the OfficeConnect Remote’s features, a description of the front panel indicators and rear panel connectors and step-by-step installation and configuration instructions.

An overview of bridging and routing and an introduction to IP and IPX protocols.

Technical Information and cable specifications Glossary of technical terms Technical Support information

Turn to:

Chapter 1

Appendix A

Appendix B Appendix C Appendix D

BOU

T THIS GUID

Conventions

The icon conventions that are used throughout this guide are:

Icon

Type

Information Note

Caution

Warning

Description

Information notes call attention to important features or instructions.

Cautions alert you to personal safety risk, system damage, or loss of data.

Warnings alert you to the risk of severe personal injury.

The text conventions used in this guide are:

Convention

“Enter” vs. “Type”

Text represented as

screen display

Text represented as

commands

Keys

Italics

Description

When the word “enter” is used in this guide, it means type something, then press the [Return] or [Enter] key. Do not press the [Return] or [Enter] key when an instruction simply says “type.”

This typeface

displays on your screen, for example:

Enter the unit’s IP address:

This typeface

commands that you enter, for example:

CO IS NU

When specific keys are referred to in the text, they are called out by their labels, such as “the Return key” or “the Escape key,” or they may be shown as [Return] or [Esc].

If two or more keys are to be pressed simultaneously, the keys are linked with a plus sign (+), for example:

Press [Ctrl]+[Alt]+[Del].

are used to denote

Italics emphasis

is used to represent

new terms

Additional Safety Information

■

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

See also the Important Safety Information at the front of this guide.

When using the unit, observe the following safety

■

information: Retain this user’s guide for later use and pass it on in

■

the event of change of ownership of the unit. The power adapter supplied with the unit is fitted

■

with a moulded plug, for connection to a standard electrical mains system supply socket. If this plug is not suitable for your connection to your mains supply, contact your reseller for advice. On no account should you attempt to connect to your mains supply using an inappropriate mains adapter.

Protect the unit from sudden, transient increases

■

and decreases in electrical power by fitting an in-line surge suppresser 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 the case or cover is not correctly fitted.

■

If the case 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 lightening

■

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.

BOU

T THIS GUID

■

Do not push any objects into the openings of the unit. Doing so can cause fire or electric shock by shorting out internal components.

■

Avoid using a telephone, which is connected to the unit (other than a cordless type), during an electrical storm. There may be a remote risk of electric shock from lightning.

Equipment connected to the Voice port must be

■

located in the same building as the unit. Be sure nothing rests on the unit’s 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 (1 inch) around the unit to provide adequate air circulation.

Install the unit in a clean area that is free from dust

■

or extreme temperatures. The unit has been designed to be a free standing

■

unit or stacked with other OfficeConnect units. Do not place anything else on top of the unit’s case.

Allow a clearance gap of at least a 150 mm from the

■

rear panel of the unit, to allow for cable access.

■

This product ostensibly complies with the electro-magnetic compatibility (EMC) requirements of EN 55022 Class A and EN 50082 (susceptibility). However, to fully comply with Class B of EN55022 the following prerequisites should be observed;

the WAN port must be attached to a screened

■

digital cable. the ISDN cable must be used in conjunction with

■

a three turn ferrite.

This unit contains a lithium battery which is

■

attached to a microchip on the printed circuit board. The defective battery must be disposed of safely in-line with the manufacturers instructions.

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.

Introduction

Welcome to the world of inter-networking with 3Com®. This chapter contains all the information you need to install and configure the OfficeConnect Remote to make it operational. You can carry out more sophisticated configuration using the information in the

Software Reference

In the modern business environment sharing information is crucial. Until now only large businesses could afford the high speed connections between offices to gain the networking advantage. The OfficeConnect Remote changes this and provides high speed, low cost inter-networking for small offices and home users.

The OfficeConnect Remote is ideal for linking together remote offices or workgroups. It is compact and attractively designed for desktop use and is part of the OfficeConnect™ range which neatly stack together with clips to provide a host of other facilities, for example, Ethernet hub, print sharing and network fax.

ETTIN

guide.

TARTE

OfficeConnect Remote Features

The OfficeConnect Remote is designed to connect a LAN (Local Area Network) at one location with a number of other LANs at remote locations. The LAN could comprise any number of PCs, servers or other computing equipment, which in an office or small business environment are typically linked together using a centrally located Office to interconnect the hubs in different locations, the OfficeConnect Remote over a WAN (Wide Area Network) ser vice provided by telephone carrier organizations.

The most modern and efficient of these WAN services includes ISDN (Integrated Services Digital Network). This provides a high speed dialup facility to allow your OfficeConnect Remote to automatically and quickly dial remote offices, transmit your data between remote PCs just as speedily and then disconnect the call. You incur minimum ISDN telephone only when needed. This is known as Dial on Demand.

unit transmits information

Connect

charges

hub. In order

as calls are made

1-2

HAPTE

ETTIN

G STARTE

ISDN can also be used to make voice calls

using the OfficeConnect Remote from an ordinary telephone handset, connect faxes and other similar office equipment.

All OfficeConnect Remote models have facilities for ISDN data transmission. Some models have an additional port for voice calls and/or a port to handle a third category of connection over a serial WAN port.

The WAN port connects to a permanent leased line, also available from your telephone carrier organization. Leased lines are available to work at a range of speeds which incur higher costs the higher the line speed. The benefit of leased lines is their permanence and fixed cost. No dialling is required but unlike ISDN you pay a fixed cost regardless of whether you transfer little data or high volumes of data 24 hours a day.

Overall ISDN is probably the most cost effective solution for small businesses. However, if your requirements to move data between sites is likely to increase you should consider purchasing the OfficeConnect Remote model fitted with both ISDN and WAN ports to ensure increased flexibility. The range of OfficeConnect Remote units is as follows:

■

OfficeConnect Remote 510

– Provides connection from 10BaseT or Thin Ethernet (10Base2) LANs to ISDN services for data transfer between remote sites.

■

OfficeConnect Remote 520

– In addition to the data transfer facilities, this model has a Voice port allowing a telephone (or other equipment such as a Fax) to communicate via ISDN.

■

OfficeConnect Remote 530

– This model has the ISDN and Voice port facilities and additionally the ability to connect via a WAN port to a serial leased line.

All of the above models are available with U or S ISDN interfaces.

Typically, the OfficeConnect Remote is used to interconnect LANs running protocols such as Transmission Control Protocol/Internet Protocol ( TCP/IP) or Novell Internetwork Packet Exchange (IPX). Offering full LAN-to-LAN connectivity at speeds up to 64 Kilobits per second (Kbps) on each ISDN channel and up to2 Megabits per second (Mbps) on the WAN port (where fitted), the OfficeConnect Remote is a compact desktop unit with unrivalled price and performance.

Introduction

1-3

The principal features of the OfficeConnect Remote are:

■

Easy to install, configure and support ISDN, 2B+D port, supporting Basic R ate interface of

■

two 64 Kbps

(or two 56 Kbps

and a 16 Kbps control channel Optional voice port.

■

Optional Leased line wide area network (WAN)

■

access port Data terminal equipment (DTE) management port

■

Support for full IP and IPX routing

■

Protocol transparent bridging

■

Sophisticated data packet filtering to provide

■

network security Provides NetWare protocol

■

Data compression based on an optimized Lempel Ziv

■

algorithm Remote and local management

■

Flash erasable programmable read-only memory

■

spoofing

channels

in the USA)

(EPROM), allowing the remote upgrading of the units operating system.

Uses simple network management protocol (SNMP)

■

and provides management information base (MIB) II support

Benefits of ISDN

ISDN is an extension of the national and international public switched telephone network, which offers a digital end-to-end telecommunication system, providing a better quality service than available using the analog telephone network. The principal benefits of ISDN are:

Fast call setup times, typically taking less than one

■

second for national calls Greater bandwidth with multiple channels.

■

The basic rate service, often referred to as ISDN 2, carries two 64 Kbps user channels, called B channels and one 16 Kbps control channel called the D channel. The line service is presented into the customers premises through a standard RJ45 socket.

A significant aspect of the ISDN service is th at it can be provided over the same wiring that was installed for the original telephone service. Therefore, ISDN can be made available relatively cheaply almost anywhere that previously had access to the analog system.

The cost of installation and rental of basic rate ISDN lines has dropped to the point where it is extremely attractive as regards cost and performance.

1-4

HAPTE

ETTIN

G STARTE

Using ISDN to Support Leased Line WAN Circuits

ISDN provides an ideal service to connect remote LANs. To be effective, the connecting bandwidth needed is at least 64 Kbps to achieve a realistic throughput. Slower speed links can be used but usually only when usage is low and infrequent, or if higher speed circuits cannot be provided.

Leased digital point-to-point circuits

can

still effective if usage spans many hours per day. However as ISDN tariffs reduce, this balance also changes. ISDN can be used to provide effective backup of these point-to-point WAN circuits in two ways.

Firstly, if the point-to-point circuit fails, an ISDN

■

channel can be dialled-up automatically and quickly, to provide an alternative path to the remote unit.

Secondly, if the leased circuit becomes heavily loaded

■

due to peaks in the traffic between remote bridges or routers, additional bandwidth can be automatically dialled-up to supplement the bandwidth of the leased circuit. The interconnected bridges would then treat the leased line and ISDN channel as parallel links, sharing the load across the two.

cost

Pack Contents Checklist

Before you install your OfficeConnect Remote, check the contents of the box against the pack contents checklist below. If any of the items have been damaged in transit or are missing, then contact the 3Com dealer from whom the equipment was purchased.

1 x OfficeConnect Remote unit.

■

1 x power adapter fitted with an appropriate plug for

■

your national power supply. 1 x 1.5 meter RJ45 to RJ45 male plug ISDN 2

■

connecting cable. 1 x 1.5 meter DB9 to DB9 serial manager port cable.

■

1 x British Telecom to RJ11 convertor (UK models of

■

OfficeConnect Remote 520 and 530 only). 1 x OfficeConnect Remote

■

1 x OfficeConnect Remote

■

1 x Warranty Registration Card.

■

It is important that you save the unit’s box and protective packing material in case you need to store, or transport it in the future.

User Guide

Software Refe rence

guide.

Introduction

1-5

Registering Ownership Of Your OfficeConnect Remote

warranty with your OfficeConnect Remote. Please take a few moments before commencing the installation to fill in the card and post it to us.

registration card is enclosed in the box

Pre-installation Requirements

Before you install your OfficeConnect Remote you will need the following:

A suitable cable for connection to your LAN (or

■

workstation if only a single workstation is attached to this unit).

Although the OfficeConnect Remote has two LAN connections (10Base2 and 10BaseT), only one port can be used at a time.

A standard ISDN line wall socket to connect the

■

ISDN cable to the ISDN port of the OfficeConnect Remote. If a suitably sited wall socket is not already available, then contact your telecommunications supplier for assistance.

A suitable cable to connect to your ISDN socket.

■

A 1.5 meter ISDN cable is supplied with this unit. The ISDN telephone number of the remote ISDN

■

unit in order to carry out the connection configuration procedure.

A suitable WAN cable if you are connecting to the

■

remote site over a leased line.

1-6

HAPTE

ETTIN

G STARTE

OfficeConnect Remote Front and Rear Panel Features

Fron t Pa ne l

Figure1-1

! ALERT

states.

■

OfficeConnect Remote Front Panel Features

(Orange) This LED indicator shows four

Off – Normal operation and no faults detected. Slow flash – Loading software during power up or

new software is being downloaded to the unit. Quick flash – S

elf test during power up

■

On – Problem detected. Refer to

“Troubleshooting”

page 1-38

information.

POWER

(Green) This LED indicator shows three states:

■

On – Power is connected to the unit.

■

Slow flash – to the unit

New software is being downloaded

for more

Introduction

1-7

Quick flash – Self test or software loading during

■

power up. Off – No power supplied to the unit. See

■

“Troubleshooting” on

page 1-38

for more details.

(Orange) This LED indicator shows the

LINK

condition of the LAN connection:

Off – No LAN connection detected.

■

On – LAN connected.

■

ISDN OK

(Green) This LED indicator provides

confirmation of the state of the ISDN line.

On – Indicates the OfficeConnect Remote is

■

connected to a working ISDN line. Sometimes this LED does not light until the first call attempt is made.

Flashing – A fault condition has been identified

■

on the ISDN line. Off – No ISDN connection present.

■

ISDN1

and

ISDN 2

(

Yellow)

These LED indicators provide confirmation that an ISDN call is in progress on ISDN Channel 1 or Channel 2. You are connected to a remote ISDN unit and are incurring ISDN call charges while this LED is lit. If the LED is flashing it indicates that a call is being made but a connection has not yet been made to the remote unit.

1-8

VOICE

HAPTE

ETTIN

G STARTE

(Yellow) If a Voice port is fitted this LED shows

the status of the voice connection:

On – A voice call is in progress.

■

Flashing – Indicates that handset is off the hook

■

and a dial tone is present or a call is being dialled or ringing out. It also shows if the handset is ringing (receiving an incoming call).

(Yellow) This LED indicator provides

WAN

confirmation of the state of the WAN link (if fitted). If the LED is lit, the WAN connection is valid and can pass data across the link. If the LED is flashing it indicates a fault on the WAN port.

ISDN Utilization

(Green/Yellow) These LEDs show the ISDN utilization as a percentage of network loading. If you consistently see a continuous ISDN loading of 100% and you require faster throughput, then you might consider the following:

You could configure the unit to filter some of

■

the data. See

the

Software Reference

guide

for

more information. An additional ISDN or WAN link is possibly

■

required to cope with the amount of data you need to transfer.

Rear Panel

Introduction

1-9

Figure1-2

POWER

the OfficeConnect Remote to connect to the mains power supply. Do not use any other adapter with this unit. match the mains inlet socket, contact your reseller for further advice.

RESET

OfficeConnect Remote

Rear Panel Feature

Only use the power adapter supplied with

If the plug on the power adapter does not

For Technical Support use only.

SERIAL

The Serial Manager port enables a management PC or terminal to be connected to the OfficeConnect Remote using the 9-pin V.24 Serial Manager cable supplied with the unit. The port provides VT100 terminal emulation, running at 9600 bps. Refer to

AppendixB

for more information about

cables. You also need a proprietary communications

software package such as Windows ‘Terminal’ to communicate with the OfficeConnect Remote.

1-10

HAPTE

ETTIN

G STARTE

(10Base2 Coaxial Port) – The coaxial LAN port

COAX

allows a 10Base2 Ethernet segment to be connected directly to the OfficeConnect Remote. If the unit is to be installed at the end of a cable run, then a 50 Ohm terminator must be fitted to the 10Base2 cable connector. This port can be used to connect to OfficeConnect hubs.

MDI/MDIX Switch

Affects the operation of the 10BaseT LAN port. If you are connecting to a hub, leave the switch in the In position. If you are connecting to a single PC, set the switch to the

Out

position to

implement the 10BaseT crossover that is required.

(OfficeConnect Remote

WAN

520 and 530

only) This port is used to provide connection to a WAN, via a private leased line. The port terminates with a 25-way D-type female connector. This port supports any of the CCITT data transmission standards; X.21/V.11 V.24/V.28 (RS232), and V.35/V.36 at data transfer rates up to 2 Mbps. Provided that connection cables that follow these standards are used, the OfficeConnect Remote automatically detects the type of interface that the por t is required to support, and configure it accordingly.

Refer to

AppendixB

for information about the WAN interface cables required. Suitable cables are available from your 3Com reseller as spare parts, refer to

AppendixB

10BASET

for required item part number

This RJ45 port is to the left of the ISDN socket when looking at the rear of the unit and is used to provide a connection to a 10Base T LAN. This sock et allows direct connection between the Of ficeConnect Remote and a single piece of equipment, as opposed to multi-point LAN connections using 10Base2 cabling systems. The OfficeConnect Remote LAN por t simulates the characteristics of a workstation port, which allows it to be directly connected to a LAN or networ k hub por t as required.

If the LAN port is to be connected directly to a single PC or workstation, then you must implement the crossover by setting the MDI/MDIX switch to the out position. See “MDI/MDIX Switch” for more information.

This port is used to connect to the ISDN network.

ISDN

The port uses an RJ45 connection socket situated to the left of the 10BaseT LAN sock et. A standard ISDN line wall socket is required to connect the ISDN cable to the ISDN port of the OfficeConnect Remote.

Introduction

1-11

(where fitted) This port is used to connect an

VOICE

optional public switched telephone network (PSTN) telephone handset, or any other compatible analog equipment, operating in digital tone multiple frequency (DTMF) mode, by connecting the handset’s plug into this port.

This port is in effect an analog to digital convertor which allows you to use your conventional PSTN telephone on an ISDN line. It is capable of supporting ringing current and call progress tones, and supports analog devices to a maximum ringer equivalence number (REN) of two (United Kingdom). Providing one of the two 64 Kbps ISDN channels is not being used by the unit, then a voice call can be made.

Incoming ISDN traffic carries both a voice and data identifier and depending on the type of transmission, a voice call is automatically directed to the appropriate port connected to the telephone handset.

The VOICE port is terminated with an RJ11 socket. If your telephone equipment uses a different connector jack, you will need to obtain a suitable convertor to connect to the VOICE port.

A British Telecom to RJ11

convertor is supplied with UK models fitted with a Voic e p or t .

1-12

HAPTE

ETTIN

G STARTE

Installation

Siting

the OfficeConnect Remote

When siting the OfficeConnect Remote, ensure: It is accessible and cables can be easily connected.

■

It is out of direct sunlight and away from sources of

■

heat. Cabling is away from:

■

Sources of electrical noise, such as radios,

■

transmitters and broadband amplifiers. Power lines and fluorescent lighting fixtures.

■

Water or moisture cannot enter the case of the unit.

■

Air flow around the unit and through the vents in

■

the side of the case is not restricted. We recommend that you provide a minimum of 25mm (approx. 1 inch) clearance around the unit.

To prolong the operational life of your equipment: Never stack

■

and ensure that they are clipped securely together. Do not place objects on top of any unit or stack.

■

OfficeConnect

units more than four high

Using the Rubber Feet and Stacking Clips

The four self-adhesive rubber feet prevent your hub from sliding around on your desk. Stick the feet to the marked areas at each corner of the underside of your hub.

The four stacking clips are used for neatly and securely stacking your OfficeConnect units together.

You can stack up to a maximum of four units. Large units must be stacked below small units.

Tostack your units, secure the clips on one side and then on the other. Use the following method to secure one side:

Place your new unit on a flat surface. Your clips fit in

the positions on the side of the unit, as shown in

Figu r e 1-3

Position a clip over one of these holes and push it in

until it clicks into place, as shown in

(1).

Figure1-3

Repeat this for the other clip position on the same side.

Keeping the front of the units aligned, rest the

bottom of the new unit on the clips’ spikes, as shown in

Figure1-3

(3). Push the clips firmly into the new

unit until they click into place.

(2).

Figure1-3

Clipping Your Units Together

Using the Rubber Feet and Stacking Clips

Wall Mounting the OfficeConnect Remote

There are two slots on the underside of the OfficeConnect Remote which are used for wall mounting. You can mount the unit with the LEDs facing upwards or downwards, to suit your needs.

When wall mounting your OfficeConnect Remote, ensure that it is within reach of the mains socket.

You need two suitable screws. Ensure that the wall you are going to use is smooth, flat, dry and sturdy. Make two screw holes which are 142 mm (5.6 in) apart. Fix the screws into the wall, leaving their heads 3mm (0.12 in) clear of the wall surface.

Remove any connections to the units and locate it over the screw heads. When in line, gently push the OfficeConnect Remote on to the wall and move it downwards to secure. When making connections, be careful not to push the unit up and off the wall.

1-13

Repeat these steps to secure the other side. To remove a clip, hold the units firmly with one hand

and hook the first finger of your other hand around the back of the clip. Use reasonable force to pull it off.

CAUTION:

Only wall mount single units, do not wall

mount stacked units.

1-14

onnect

HAPTE

ETTIN

G STARTE

ing the Power Adapter

CAUTION:

Information”

Isolate the electrical mains system supply before commencing installation.

Ensure socket a

Connect the jack of the power adapter to the socket on the rear panel of the OfficeConnect Remote (see

“Rear Panel”

lug the mains lead adjacent electrical mains system socket necessary turn on the power at the outlet socket.

First, read the section;

at the start of this manual.

any o

n/off power switches

re set to their ‘OFF’ positions.

page 1-8

of the power adapter i

“Important Safety

at the outlet

nto an

and if

Connecting to Your 10BaseT LAN

The OfficeConnect Remote performs a self test

loads the software loading

the ALERT and POWER LEDs flash.

. During the self test

and

and software

Figure1-4

You can connect the OfficeConnect Remote to a hub using 10BaseT cable in the following way:

Connect the UTP cable (not supplied) to the 10BaseT

port of the OfficeConnect Remote. Connect the other end to a 10BaseT port on your hub.

Connect The UTP Cable To OfficeConnect hub

Figure1-5

Connect The

UTP

Cable To In-House Lan Connection Box

Using the Rubber Feet and Stacking Clips

Connecting to a Single Workstation

To connect the OfficeConnect Remote to a single personal computer or workstation:

Implement the crossover for the 10BaseT port on the

OfficeConnect Remote

switch to MDIX (out).

Connect the UTP cable (not supplied) directly into the RJ45 socket marked LAN on the Remote

Connect the other end to the 10BaseT socket on the

workstation’s Ethernet adapter.

by setting the MDI/MDIX

OfficeConnect

1-15

To connect the OfficeConnect Remote to i

n-house

LAN:

Connect the UTP cable (not supplied) into RJ45 socket marked LAN on the OfficeConnect Remote.

Connect the other end of the cable into the female socket of the in-house LAN connection box, as shown in

Figure1-5

, or directly to a 10BaseT hub port.

1-16

HAPTE

ETTIN

G STARTE

Connecting to Your 10Base2 LAN

You can use the10Base2 Coaxial port to connect to your network and to other OfficeConnect units.

When using 10Base2 cable, it is important that both ends of the segment are properly terminated with 50Ohm end pieces.

Only use 50 Ohm 10BaseT cables and use a ‘Y’ piece for each unit to ensure adequate clearance of the other ports. find that a traditional ‘T ’ piece does not provide enough clearance to allow space for fingers and cables when units are stacked together.

Due to

the small size of the unit, you may

Connect a 10Base2 ‘Y’ piece to each

OfficeConnect

unit and every other device to be connected. Daisy-chain each ‘Y’ piece with a length of 10Base2

coaxial cable to form a single segment as shown in

Figure1-6

. Remember to terminate

the

two free ends

of the segment by fitting end pieces. To disconnect a 10Base2 cable, twist each connector

counter-clockwise to unlock it and remove it.

Figure1-6

Connecting 10Base2 Cable

Using the Rubber Feet and Stacking Clips

1-17

Connecting to ISDN

Figure1-7

Connect ISDN Cable Into A Proprietary ISDN Wall Box

Connect the supplied ISDN cable from the ISDN port into the ISDN wall box (NT1). See

CAUTION:

OfficeConnect Remote

voltage could damage the unit.

Do not connect the ISDN line into the

Figure1-7

’s LAN port as the ISDN line

Connecting to the WAN

If your OfficeConnect Remote unit is fitted with a WAN port, you can connect to a WAN Network Terminating Unit (NTU) fitted by your WAN service supplier. Using a suitable WAN cable (as described in connect one end to the WAN port on the OfficeConnect Remote unit and the other to the NTU.

Connecting to the VOICE Port

If your OfficeConnect Remote is fitted with a Voice port, then a standard telephone handset or other analog telephony equipment, such as a a fax or answering machine, can be connected to the port marked VOICE if required. This port can also be used to connect the OfficeConnect fax ser ver to ISDN.

Some service providers offer Basic Rate ISDN connections with a single B-channel. If you connect a handset to a unit connected to this type of ISDN service, you cannot pass data while the voice port is in use. We recommend that you only connect voice equipment to ISDN services offering the standard 2 B-channel Basic Rate service.

AppendixB

)

1-18

HAPTE

ETTIN

G STARTE

The VOICE port is terminated with an RJ-11 socket. If your telephone equipment uses a different connector, you will need to obtain a suitable convertor to connect to the VOICE port. A British Telecom to RJ11 convertor is supplied with UK models fitted with a Voice port.

A dial tone is not provided to the handset if the ISDN line is not operational or has been disconnected.

Connecting a Management Terminal

Connect the Serial Manager cable to the Serial Manager port (marked Serial). Connect the other end to the serial COM port on your PC workstation.

When you have connected a management terminal, you can configure the Office Connect Remote to communicate with the remote site(s). See

Configuration”

overleaf.

Location of OfficeConnect Fax and Print Servers

If you are connecting the OfficeConnect Fax Server or Print Server to the OfficeConnect Remote, you must configure these units to operate with local servers only. If you do not do this, unnecessary ISDN calls are made, caused by the fax or print server polling the fax

or print queue on remote servers at regular intervals (between once every 30 seconds to once a minute).

“Quick

Quick Configuration

1-19

used for data transmission, 9600 bits/s – 8 data bits – 1 stop bit – no parity, with flow control set to none.

This section describes how you can configure the unit to bridge or route over ISDN links to suit most networking requirements using a simple forms-based user interface. If you want to connect to a remote site using leased line WAN links see

WAN Lin k ”

page 1-29

If you are unsure about the networking configuration you require, see

Networking Applications”

“Examples of Typical ISDN

information.

IMPORTANT

The Quick Configuration menu option is designed to be used only when you set up the unit for the first time. If you want to make any changes to the unit’s configuration at a later stage, you should use the management system menus to make these changes. For more information, see the Software Reference guide.

Starting Quick Configuration

Using a VT100 compliant terminal emulator, setup the

terminal emulation to VT100 with communications parameters set as follows; select the COM port to be

“Setting Up a

page 1-31

for more

Example Using Windows 3.1 Terminal Application

Start the Windows ‘ Terminal’ application. Using a mouse, click on

Settings

in the status bar to reveal

the menu. From the menu:

Select the

that Select the

Terminal Emulation

DEC VT-100 (ANSI)

Communications

dialo

g b

ox; confirm

is selected.

dialog box; check the

communications parameters are set as above. Select the

Terminal Preferences

dialo

g b

ox;

confirm that all check-boxes have been cleared.

hould the cursor disappear during configuration, confirm that the Cursor Blink check-box has been checked (i.e. shows a cross in it).

hould the keyboard arrow keys fail to move the cursor during configuration, confirm that the ‘Use Function, Arrow, and Ctrl Keys for Windows’ check-box has not been checked.

Now save this configuration as a Windows

terminal emulator file for future use.

1-20

HAPTE

ETTIN

G STARTE

If you are using Windows 95, use the Hyperterminal application and configure it in the same way as described above.

Figure1-8

If the terminal emulator has been correctly configured, pressing [RETURN] displays the Enter Password screen.

The Main Menu Screen

Enter the default password, uppercase characters. The Main Menu appears shown in

Figure1-9

At the command prompt enter The screen changes to display the Quick

Configuration menu shown in

Figure1-8

Quick Configuration Menu

PASSWORD

Figu r e 1-9

using

Quick Configuration

1-21

About Quick Configuration

You can configure the unit to connect to other Novell networks, to bridge to hosts on the same IP network (a network with the same IP network address), to route to a different IP network (an IP network with a different IP network address) and to connect to the Internet or other Point-to-Point Protocol (PPP) router. By using the commands several times, you can configure the unit to automatically connect to a combination of the above networks or to several different networks of the same type.

For example, if you need to connect to an IPX site, an IP host on a different network and to the Internet using an ISDN connection to your Internet service provider you would do the following.

Use the NO command to configure the connection to

■

the Novell server at the remote site. Use the

■

to the remote IP host. Use the IN command to configure the connection to

■

your Internet service provider’s router.

command to configure the connection

IPR

The OfficeConnect Remote talks to other OfficeConnect Remote units using its own very efficient FastConnect protocol over the ISDN or WAN port connections. If you need to communicate with another manufacturer’s equipment, then you need to configure the OfficeConnect Remote to use the PPP protocol using the

Internet

option. See later in this section for more information. You can further configure the PPP parameters using the management system. See the

Software Reference

guide for more information.

Before configuring the unit to use PPP, you should check with your Internet service provider or with the system administrator of the remote site to find out which PPP parameters should be set and what their values s houl d be. Do

attempt to configure the

not

unit to use PPP without this information.

You cannot configure the unit to be an IP bridge and IP router at the same time.

1-22

HAPTE

ETTIN

G STARTE

Setting the Unit Name

Before you configure the unit to connect to any other network, you must first give the unit a name. Enter NA at the command prompt on the Quick Configuration screen to display the screen illustrated in

Figure1-10

The fields on this screen are:

Unit Name

Type in a suitable name for this unit. The name can be up to 12 characters long, must contain no spaces and should, where possible, give an indication of the geographical location of the unit or the name of the users.

Manager LAN IP Address

Type the IP address for this unit. It must be a unique IP address on your network.

Manager LAN IP Mask

subnet mask. See

Enter an appropriate IP

“Subnet Masking”

AppendixA

for more information about subnet masks.

Network Type

Toggle the network type to match the ISDN service provided by your ISDN service provider.

Figure1-10

SPID 1 and 2

some ISDN service providers in the USA. If SPID is used, enter the value you are given by your ISDN service provider. Leave this field blank if you have not been provided a SPID.

Directory Number 1 and 2

associated with each SPID. Press [CTRL]+[E] to submit these parameters.

Setting The Unit Name

Service Profile IDs (SPID) are used by

Enter the ISDN number

Quick Configuration

1-23

Connecting to a Novell (IPX) Network

To connect to a Novell network using FastConnect, enter NO at the command prompt on the Quick Configuration screen to display the screen illustrated in

Figure1-11

Complete the fields on this screen as follows:

Figure1-11

Connecting To A Novell Network

Do you have a local server?

Use the [Spacebar] to

toggle this field to Yes or No as appropriate. If you have a local server, the unit’s configuration is

updated to ensure that no data destined for local servers is passed over the link

Remote ISDN Number

Type the ISDN number of the

remote unit that connects to the Novell network.

Call Type

Use or

Set the Call Type for each ISDN number.

64k Unrestricted

56k_restricted

for Euro ISDN lines. Use

in the USA depending on the

56kV.110

requirements of your ISDN service provider. Press [CTRL]+[E] to submit this information.

When you do this the unit automatically makes a short call to the remote unit to interrogate the remote network for information about its servers. When it has obtained the information it needs the call is automatically disconnected. The unit then updates the autocall table so that when data is destined for a remote server, the unit automatically dials the correct ISDN number and connects to the remote network.

Enter

at the command prompt to permanently

SAVE

store this configuration in the unit’s memory.

1-24

HAPTE

ETTIN

G STARTE

Connecting to an IP Host on the Same IP Network

To connect to an IP host on the same network using FastConnect, enter the Quick Configuration screen to display the screen illustrated in

Figure1-12

Complete the fields on this screen as follows:

Figure1-12

Connecting To An IP Host On The Same Network

at the command prompt on

IPB

Remote ISDN Number

Type the ISDN number of the

remote unit that connects to the IP network.

Call Type

Use or

Set the Call Type for each ISDN number.

64k Unrestricted

56k_restricted

for Euro ISDN lines. Use

in the USA depending on the

56kV.110

requirements of your ISDN service provider.

Remote IP Address

Type the IP address of the

remote IP host to which you want to connect. Press [CTRL]+[E] to submit this information. An entry is made in the autocall table so that if any

data destined to the remote host, a call is made automatically and a connection made to the remote IP network.

Enter

at the command prompt to permanently

SAVE

store this configuration in the unit’s memory. Although calls to the remote site are only generated

when data is addressed to a specific IP host or hosts (in our example, 191.000.000.100), any data that cannot be identified as local is also passed over the link while it is open. This can prevent the link from closing after the intended data has been transferred.

Quick Configuration

1-25

To avoid this situation you can also configure the units at both ends of the link to implement a Firewall and/or set the

Maximum Call Duration

in the ISDN parameters screen to reduce the amount of traffic permitted to pass across the link. See the

Reference

guide for more information about these

Software

features. Alternatively, you may wish to configure the unit to

operate as a router to prevent this problem occurring altogether. However, this requires that each site consists of separate subnets. See the next section for more information.

Connecting to an IP Host on a Different IP Network

To connect to an IP host on a different network using FastConnect, enter the Quick Configuration screen to display the screen illustrated in

Figure1-13

Connecting to an IP Host on a Different Network

at the command prompt on

IPR

Complete the fields on this screen as follows:

1-26

HAPTE

ETTIN

G STARTE

Remote ISDN Number

Type the ISDN number of the

remote unit that connects to the remote IP network.

Call Type

Use or

Set the Call Type for each ISDN number.

64k Unrestricted

56k_restricted

for Euro ISDN lines. Use

in the USA depending on the

56kV.110

requirements of your ISDN service provider.

IP Address of this unit’s LAN

Type the IP address of this unit. This the address you entered on the Name screen.

IP Mask of this unit’s LAN

Type the IP subnet mask you entered for this unit on the Name screen. See

AppendixA

IP Address of this end of the ISDN link

for more information about subnet masks.

By default this field is set to UNNUMBERED which allows unnumbered links to be used. This options is suitable for most network configurations. See

AppendixA

for more information about numbered and unnumbered links.

If you want to use numbered links, you must enter an IP address for this port that is on a different network or subnetwork than the unit’s IP address.

IP Address at the other end of the ISDN link

By default this field is set to 0.0.0.0 indicating unnumbered links are being used. If you are using numbered links, type the IP address of the remote ISDN port on the unit to which you want to connect. It must be on the same network or subnetwork as the local ISDN por t.

IP Mask of the ISDN Link

If you are using unnumbered links, leave this field set to 0.0.0.0. If you are using numbered links, type a subnet mask suitable use with the IP addresses you have selected for the ISDN ports at both ends of the link. See

AppendixA

IP Address of the Remote Host

for more information about subnet masks.

Type the IP address

of remote host to which you want to connect.

Remote IP Mask

the address type being used. See

Type an IP subnet mask to match

AppendixA

for

more information about subnet masks. Press [CTRL]+[E] to submit this information.

An entry is made in the autocall table so if any data destined to the remote host, an automatic call is made and a connection made to the remote IP network.

Enter

at the command prompt to permanently

SAVE

store this configuration in the unit’s memory.

Quick Configuration

1-27

Connecting to the Internet or a PPP Router

To connect to an Internet router or to a router using Point-to-Point Protocol (PPP), enter IN at the command prompt on the Quick Configuration screen to display the screen illustrated in

Figure1-14

Complete the fields on this screen as follows:

Connecting To The Internet Or PPP Router

Figure1-14

If you are connecting to the Internet, your service provider will be able to give you the correct values for each of these fields.

If you are connecting to a remote PPP router, check with the system administrator of the remote network for the correct values for these fields.

Name of your Internet Provider or remote site

Type the name of your Internet service provider or of the remote unit that connects to the remote IP network.

ISDN Number of the remote unit

Type the ISDN number of the remote unit that connects to the remote IP n etwor k.

Call Type

Use or

Set the Call Type for each ISDN number.

64k Unrestricted

56k_restricted

for Euro ISDN lines. Use

in the USA depending on the

56kV.110

requirements of your ISDN service provider.

IP Address of this unit’s LAN

Type the IP address of this unit. This the address you entered on the Name screen.

IP Mask of this unit’s LAN

Type the IP subnet mask you entered for this unit on the Name screen. See

AppendixA

for more information about subnet masks.

1-28

HAPTE

ETTIN

G STARTE

IP Address of this end of the ISDN link

this field is set to

UNNUMBERED

which allows

By default

unnumbered links to be used. This options is suitable for most network configurations. See

AppendixA

for more information about numbered and unnumbered links.

If you want to use numbered links, you must enter an IP address for this port that is on a different network or subnetwork than the unit’s IP address.

If you are routing IPX using PPP, you must use numbered links.

IP Address at the other end of the ISDN link

default this field is set to

UNNUMBERED

indicating

unnumbered links are being used. If you are using numbered links, type the IP address of the remote ISDN port on the unit to which you want to connect. It must be on the same network or subnetwork as the local ISDN port.

IP Mask of the ISDN Link

AppendixA

for more information about subnet masks.

IP Address of the Remote Host

Type the IP address of a host on the remote network to which you want to connect.

IP Mask of the remote host’s network

Type an IP subnet mask to filter connections to inappropriate hosts. See

AppendixA

for more information about

subnet masks.

Make of remote router

This option sets PPP parameters needed to connect to the remote unit in its default configuration. If the remote unit’s PPP configuration has been altered, you will need to amend the PPP parameters on this unit to reflect the changes. Refer to the

Software Reference

guide for

more information Toggle this field to the type of remote router to

which you are connecting. The PPP options for the default settings at the remote router are then automatically configured when you press [CTRL]+[E] to exit this screen. The options are:

Default – Use this option if you are connecting to

■

another OfficeConnect Remote. Also use this option if the remote unit is none of the following and amend the PPP parameters accordingly.

Quick Configuration

1-29

3Com – 3Com NETBuilder router.

■

Cisco – Cisco router. Ascend – Ascend router.

■

Spider – Spider/Shiva router.

■

f you are connecting to a Spider/Shiva router, you need also to edit the ISDN port’s configuration and set the PAP field in the LCP Configuration screen to Incoming. See the Software Reference guide for details.

PAP Password to login to Remote Site

this is set to

UNUSED

. If you need to use a PAP

By default

password, enter the password provided by your Internet service provider or the system administrator responsible for the remote router.

This password is submitted to the remote unit for it to verify. The password is case-sensitive.

PAP Password for others to login to you

this is set to

UNUSED

. If you need to use a PAP

By default

password, enter the password provided by your Internet service provider or the system administrator responsible for the remote router. Your unit verifies that the remote unit is valid by comparing its submitted PAP password with the entry in this field. The password is case-sensitive.

CHAP Password to login to Remote Site

this is set to

UNUSED

. If you need to use a CHAP

By default

password, enter the password provided by your Internet service provider or the system administrator responsible for the remote ro uter. submitted to the remote unit for it to verify.

This password is

The password is case-sensitive. To ensure security, it is recommended that the local password is different from the remote password.

CHAP Password for others to login to you

default this is set to

UNUSED

. If you need to use a

CHAP password, enter the password provided by your Internet service provider or the system administrator responsible for the remote ro uter.

Your unit verifies that the remote unit is valid by comparing its submitted CHAP password with the entry in this field. The password is case-sensitive.

Press [CTRL]+[E] to save this information. An entry is made in the autocall table so that if any

data destined for the Internet or Remote PPP routed network, a call is made automatically and a connection made to the remote router.

Enter

at the command prompt to permanently

SAVE

store this configuration in the unit’s memory.

1-30

HAPTE

ETTIN

G STARTE

Monitoring ISDN Line Usage

After you have first configured the unit for use with ISDN, it is important to monitor ISDN line usage to ensure that the unit is working in the way you expect.

Check the ISDN 1 and ISDN 2 LEDs to ensure that unexpected calls are not being made or that connections are not remaining open when you expect them to have closed.

Even if the ISDN Utilization LEDs are not lit, call with little or no data transfer may be in progress depending on how you have connected or configured the unit. As in a conventional telephone call, charges are made regardless of what is sent down the line until the call is dropped.

If you want to ensure that ISDN line usage is limited, set up ISDN Timebands or set the

Duration

for more information on these features.

parameter. See the

Software Reference

Maximum Call

guide

Setting Up a WAN Link

If you are using the OfficeConnect Remote to connect to a remote site over a leased line link, the initial setup is very simple.

Before you power on the unit, connect an

appropriate WAN cable to the WAN port on the rear of the unit. If you have already powered on the unit, switch it off and connect the cable.

For more information about suitable cables, see

AppendixB

Power on the unit.

The OfficeConnect Remote automatically configures the WAN port to the appropriate line speed.

Refer to the

WAN port’s configuration as follows:

a b c

Software Reference

From the main menu, enter Highlight the WAN port. Enter ED to display the Edit WAN Port screen

shown in

Figure1-15

guide and edit the

CO PO

If you are routing, edit the Port IP address to set

UNNUMBERED

it to

or to a valid IP address for the

WAN link. See

AppendixA

for more information about

using numbered and unnumbered links. If you are bridging, leave this field at the default

setting. If necessary, change any of the other parameters

to suit your WAN link. In most cases the defaults can be used.

Press [CTRL]+[E] to submit this configuration.

The WAN port is now configured and provided the remote unit’s WAN port has also been configured, data will be passed across the link.

Enter

at the command prompt to permanently

SAVE

store this configuration in the unit’s memory.

Figure1-15

Setting Up a WAN Link

Edit WAN Port Screen

1-31

1-32

HAPTE

ETTIN

G STARTE

Examples of Typical ISDN Networking Applications

This section describes four of the most common applications of the OfficeConnect Remote. All of these configurations can be carried out using the

Quick Configuration

configuration is necessary to make the unit operational. However, you may want to fine tune the performance of the OfficeConnect Remote. information provided in the will help you do this.

The four typical applications are: Connecting to a Novell Network.

■

Connecting to an IP host on the same IP network.

■

Connecting to an IP host on another IP network.

■

Connecting to the Internet or a PPP router.

■

You may need to combine two or more of these applications to provide full connectivity to your network. This is easily done by repeating the

Configuration

option and no further

Software Reference

guide

Quick

option as many times as is needed.

The

Novell Network

Many organizations base their local area networks on Novell NetWare servers and users may need to access information stored on servers in other locations. If you are using ISDN to connect to the remote site, you can configure the OfficeConnect Remote to automatically call and connect to remote Novell servers when connection is required.

During configuration, once you have entered the ISDN number for the remote site, the OfficeConnect Remote makes a call to the remote site and autodiscovers the Novell servers on that network. It is then able to autocall the remote site whenever a connection to one of the remote servers is requested. To the user at the local site it will appear as though the server is on the same network.

When no data is being passed between the workstation and server, the OfficeConnect Remote closes the ISDN connection and the units at each end of the link the Novell IPX protocol so that both the workstation and server believe the connec tion is still valid. As soon as the unit identifies that data needs to be passed to the server, the ISDN connection is re-established without the user being aware of ever being

spoof

Examples of Typical ISDN Networking Applications

1-33

disconnected. In this way ISDN calls are kept to a minimum.

Figure1-16

In the example shown in connected to a Remote Site. The Local Site shown has several workstations and a server but could equally consist solely of workstations or even a single workstation (such as in the case of a homeworker). The Remote Site may be a central site for an organization or simply another like-sized office.

If you are connecting to the remote site over a WAN leased line link, the OfficeConnect Remote has no need to spoof the IPX protocol as there is a permanent connection in place. Once the

Connecting to a Remote Novell Network

Figure1-16

, the Local Site is

OfficeConnect Remote has determined that the server is on the Remote Site all data between the server and workstation is passed over the link.

1-34

HAPTE

ETTIN

G STARTE

IP Host on the Same IP Network

If your organization operates a TCP/IP network and needs to extend the IP network over geographically remote sites, it is possible to bridge the network using the OfficeConnect Remote. It is only possible to bridge where both sites have the same network address and the devices are on the same subnet. In a class C IP address, the network address is the first three groups of numbers. For example:

192.000.000.xxx

where devices on the subnet. See

AppendixA

Typically IP bridging would be used to connect a back office or home office into a main site. further network connections would be carried out from the main site. An example of such a network is shown in

During configuration, you enter the ISDN number and the IP addresses of any hosts to which you want to connect. In the example in of the host 191.000.000.100 is used and only when data destined for this device is received by the OfficeConnect Remote, is a call made to the remote site.

represents the host ID of the individual

xxx

“IP Addresses”

for more information about addresses.

Figure1-17

Any

, the IP address

Figure1-17

There are some issues about which you should be aware when implementing an IP bridging solution.

Although calls to the remote site are only generated

■

when data is addressed to a specific IP host or hosts (in our example, 191.000.000.100), any data that cannot link while it is open. This can prevent the link from closing after the intended data has been transferred.

Some devices and applications (for example

■

autodiscovery programs on SNMP managers) poll all devices on a subnet at regular intervals and this could lead to frequent ISDN calls if you have entered

IP Bridged Network

be identified as local is also passed over the

Examples of Typical ISDN Networking Applications

1-35

several IP hosts to generate autocalls to the remote site. When combined with the problem described above, you could find your ISDN line permanently connected.

To avoid this situation you need to be sure that no devices or applications exist on your local site that could make unnecessary and costly calls to your remote site. You can also configure the OfficeConnect Remote units at both ends of the link to implement a Firewall and/or Call Guillotine to reduce the amount of traffic permitted to pass across the link. See the

Software Refe rence

guide for more

information about these features. Alternatively, you may wish to configure the

OfficeConnect Remote to operate as a router to prevent this problem occurring altogether. This however requires that each site consists of separate subnets. See the next section for more information about IP routing.

IP Host on Another IP Network

Most organizations using TCP/IP protocols on their network, choose to subnet remote sites or even to have them on different networks. This requires that connections to remote sites are routed rather than bridged. The advantage of routing over bridging is that calls to the remote site are only made when data is specifically addressed to a remote network. Bridging passes any data not known to be for the local network to the remote network whether that is its destination or not.

Because the ISDN number can be associated with a remote network rather than just a specific IP host, any data for the remote network can generate an autocall and be routed over the OfficeConnect Remote. If you need to connect to IP hosts on several networks, you will need to use routing to be able to communicate with the different hosts.

The example shown in Site connected to two Remote sites over ISDN. sites are connected using OfficeConnect Remote units.

Figure1-18

shows the Local

All

1-36

HAPTE

ETTIN

G STARTE

Internet or PPP Router

Some small businesses need high-speed connections into the Internet or need to connect to large global networks used by larger organizations. When communicating with another OfficeConnect Remote , the unit uses FastConnect, its own proprietary high speed protocol. However, in order to connect with other routers it needs to be configured to use the slower PPP protocol. PPP is used by many other routers.

Increasingly Internet service providers are offering access to the Internet over ISDN via an ISDN router. PPP routing over ISDN allows a simple cost-effective connection to the Internet or into a large organization’s global network.

Figure1-18

IP routed network

Examples of Typical ISDN Networking Applications

1-37

Figure1-19

PPP Connections to the Internet and Corporate Network

1-38

HAPTE

ETTIN

G STARTE

Multiple Connections from a Single Site

In some instances it is likely that you will need to connect to Novell servers on one site, IP hosts on the same remote site or possibly a different remote site and a connection into the Internet. This can all be achieved by running the simple configuration several times until all the desired types of connection have been configured. The only thing you need to be aware of is that you cannot bridge and route the same protocol.

The local site shown in

Figure1-20

is a small business that needs data links to several of its clients and a connection to the Internet. It has an IPX connection to access information on one client’s NetWare server and IP routed connections to several IP hosts at different clients’ sites. Finally, there is a connection to the local Internet service provider’s PPP router giving fast access to the Internet.

All connections can be set up with an autocall so that connections to the remote sites are made as soon as the OfficeConnect Remote identifies data not destined for the local network.

Figure1-20

Multiple Connections from a Single Site

Troubleshooting

1-39

Troubleshooting

WARNING:

inside the case of the unit.

CAUTION:

information’, at the start of this manual.

The OfficeConnect Remote is fully performance tested after assembly. Providing the unit has been correctly installed, and is used in accordance with the instructions contained in this manual, difficulties should not arise. If unit or system maintenance is required, then it must be carried out by a competent network engineer.

In the unlikely event that you experience problems with the unit, the following procedure will enable you to undertake basic troubleshooting before contacting your 3Com reseller.

There are no user serviceable components

Read the section ‘Important Safety

Malfunction

If you cannot connect your OfficeConnect Remote to the network or PC.

The POWER LED does not light.

Remedy

Verify that your computer is equipped with an available serial port and that the correct cables and connectors are being used. If in doubt contact the unit’s supplier.

Confirm that: a)

The switched outlet socket of the electrical mains system supply is turned on. The main lead is correctly plugged into the unit’s electrical mains system inlet socket.

The switched outlet socket is ‘live’ by plugging the unit into an alternate socket to see if it functions.

1-40

HAPTE

ETTIN

G STARTE

Malfunction

The ISDN OK LED does not light.

Remedy

Follow the procedures as outlined for

POWER LED does not light.”

Ensure that the OfficeConnect Remote is powered up and the POWER LED is lit.

Confirm that the ISDN UTP cable is correctly connected, and that the cable is attached to the socket marked ISDN.

Confirm that the ISDN line socket that is connected to the unit is conveying an ISDN service.

Check that the ISDN port is configured using the CO

Software Reference

command. See the

guide for more

information about this command.

Try making an ISDN call using a telephone connected to the ISDN line to confirm if the line is operational.

If the LED still fails to light, plug the UTP cable into an alternate ISDN service socket to confirm that it functions.

Try using an alternate UTP cable to connect the unit to the ISDN service socket.

“The

Malfunction

If other LEDs do not light during operation of the unit.

The local unit does not connect to the remote unit.

Remedy

During normal operation the remaining unit LEDs should light and extinguish depending on the action being taken. If the LEDs fail to light in accordance with their function (refer to

“Front Panel”

page 1-6

), then contact

your supplying 3Com reseller. a)

Check the connections between the unit, the network, or PC and the ISDN line.

Confirm that the line is working by connecting a telephone to the ISDN line to make a call.

Check that the number which you are dialling is connected to the remote unit and that the unit is configured to be able to answer calls.

Introduction

During the initial configuration of the OfficeConnect Remote you must decide whether to configure the unit as a bridge or as a router although we may help you with this choice with our Quick Configuration options. If you are unsure which option you should choose, read this appendix to help you decide.

Bridges and routers are used to connect networks together. The cost of connecting networks together is generally proportional to the distance over which the network extends and the amount of bandwidth required. Large amounts of bandwidth can be provided easily within a LAN by connecting different segments together with a local bridge. However, it becomes impractical and expensive to extend this bandwidth over larger distances, and it is, therefore, usual to interconnect local high speed networks using bridges or routers connecting over slower speed terrestrial and satellite links.

RIDGING AND

OUTIN

In the following sections we describe the concepts behind bridging and routing, and discuss the different ways in which LANs can be configured and operated to optimize performance and minimize disruption of traffic on each individual LAN.

Bridging and Routing Concepts

A bridge connects one or more LANs together. It examines each data frame received at a LAN port and forwards any frames that it assumes are for a destination device not connected to that LAN port. The bridge is able to do this by learning which devices are connected to each LAN port.

A router learns much more about the networks connected to it and is able to be much more selective about the data it passes on to other networks and to which networks it transmits. By default routers reject or

filter

data unless it matches predefined attributes (for example specific protocols or destination network addresses). In large interconnected networks a router selects the best route for data to travel.

A-2

RIDGING AND ROUTIN

Guidelines For Choosing Bridging or Routing

The list below outlines some of the reasons why you might choose to configure the as a bridge or a router. Read through the rest of this appendix for more explanation and to help decide which of the above conditions apply to your network.

A bridge is simpler to configure but a router can

■

provide more security on a busy network and filter unwanted data transmissions more effectively.

If your network consists of only one or two links

■

between different sites and your network is not heavily loaded, in most circumstances you can configure your OfficeConnect Remote units as bridges.

If your network structure is complicated and consists

■

of a mixture of leased line and ISDN links, or if it uses several different protocols, you may obtain better performance from the OfficeConnect Remote units if you configure them as routers.

If you are connecting to a routed corporate n etwork

■

that is already running IP and/or IPX protocols or if you are using the

OfficeConnect Remote

Internet you must configure the unit as a router.

OfficeConnect Remote

to connect to the

How Bridges Learn

When a bridge is first powered on, it does not know the number or the locations of stations that are connected to the LAN. To minimize the amount of data passed over the bridge it must

learn

the whereabouts (address) of stations to ensure that it passes only the data that is intended to be passed over the bridge.

Like the envelope of a letter, the header of each frame of data transmitted on the network has a From (source) address and To (destination) address. This ensures that data reaches its destination on the LAN and that the receiving station can reply. The bridge reads every frame of data received at the LAN port and extracts the source address of the frame. From this information it builds an address table of stations it knows to be on the LAN.

To decide if data should be passed over the bridge, the bridge examines the destination address of the frame. If the address is already in its address table, the bridge knows the destination is on the LAN and therefore rejects or

filters

the frame.

If the destination address is not in the address table, the bridge transmits the data across the bridge. It does this even if the destination device is on the

Bridging and Routing Concepts

A-3

local LAN because it does not recognize the destination station as local. However, if the destination device is on the local LAN, once it replies to the original source station, its own source address is part of the data frame and it is learned by the bridge and added to the address table.

By operating in this way, the amount of data forwarded by the bridge is kept to a minimum. Traffic that is for devices on the attached LAN is rarely forwarded over the bridge.

A bridge can be configured to forget or

age

a station’s address after a period of inactivity, a facility which is used to ensure that stations which are no longer attached to the LAN, do not remain in the bridge’s address table, using up space that may be required for other stations’ addresses.

Some bridges allow address information to be manually configured into the bridge, provided the automatic

learning

facility is turned off, although this will not normally prove necessary unless specific traffic filtering is required.

You can also configure a number of other features to improve the performance and operation of the OfficeConnect Remote. These include sophisticated frame filtering techniques so that only certain types of frame, or those associated with particular work groups, are passed between specific segments.

Bridging Between Remote Sites

The OfficeConnect Remote is able to send frames between LANs that may be separated by considerable physical distances. It achieves this by making use of Wide Area Network ( WAN) links. WANs can be established by using either digital leased lines or ISDN and are usually operated by telephone companies (PTTs) or other service providers.

Figu re A- 1

are connected by a pair of OfficeConnect Remote units, 1 and 2. The type of link between the two depends on the WAN services available at each of the remote bridge locations, and the price the network administrator is willing to pay for those services.

shows two LAN segments, A and B, which

A-4

Figu re A -1

The OfficeConnect Remote uses FastConnect, its own protocol, to ensure the most efficient connection with other OfficeConnect Remote units. However, if you are connecting to a different type of bridge/router the standard PPP communications protocol is required to establish the link. You can configure outgoing calls to use either FastConnect or PPP as required. The ISDN port on the OfficeConnect Remote autosenses the protocol

RIDGING AND ROUTIN

Simple Remote Bridging

being used on incoming calls and switches to the protocol necessary for that connection.

If you are using ISDN to connect to different networks, the two B channels can be used independently to connect to different networks at the same time.

Building a Larger Network

Large networks of interconnected LANs can be established by using multiple bridges as illustrated in

Figu re A- 2

The bridges build up their address tables. If the destination unit is not registered as being accessed via the bridge’s LAN interface, the frame will not be placed on LAN A. Therefore, frames passing between LAN B and LANs C or D will not impact the overall performance of the LAN.

Figu re A -2

Multiple Remote Bridges

Bridging and Routing Concepts

Multiple Paths Between Bridged LANs

With only a single physical path between LANs, the network is susceptible to link and bridge failures. In the event of a failure, the connection between any of the LANs upstream or downstream of the point of failure will be broken. A more resilient network of interconnected LANs can be established by providing more than one link between any two of the LANs.

Normally, this network would soon encounter serious problems resulting from a loop, around which frames could endlessly travel if precautions aren’t taken by the bridges. Over ISDN links a proprietary form of loop control is implemented. On WAN leased line links the Spanning Tree Protocol (STP) prevents data loops.

On startup, the bridges send out frames to enquire if there are other bridges on the network. By exchanging information, the bridges block ports that cause the loops and ensure that there is only ever one active path through the network. If one of the links or bridges fail, the other bridges detect this and reconfigure their ports so that there is once again an active data path through the network.

A-5

A-6

RIDGING AND ROUTIN

Network Topology

If your network topology is star shaped, a combination of ISDN and bridging is usually the most efficient and successful option. Routing is a better solution if your network topology is a complex mix of both leased line and ISDN circuits, running at 64 Kbps to 2 Mbps.

Broadcast Storms

Bridges are programmed to automatically forward data packets by default while routers filter data packets by default. These attributes have an impact on the overall flow of data across the network. Much has been made of with bridged networks, where the broadcast signals from bridges propagate to fill all of the wide area bandwidth, and bring the network down. Broadcast storms cannot be attributed to installation of bridges or routers, but by poor protocol implementation and network design. However the deployment of routers can effectively logical network from another.

broadcast storms

in connection

firewall

one

Optimum Use of Resource

Bridged networks use Spanning Tree Protocol (STP) to provide network resilience, by retaining redundant links on stand-by, in case the primary link fails. This means that you are not making maximum use of available resources.

Routing protocols make each node aware of the primary and alternate routes available, ensuring that resources (particularly WAN links) are not wasted.

Routers have been designed to provide the optimum route through the network from the workstation through to the destination resource with which the user wishes to communicate. In a very large network there could be multiple paths available, and these could change as dedicated links go in or out of service. These changes in network topology are handled by routing protocols. However, when using the ISDN the source network can dial direct to the destination network, and establish a point-to-point bridged or routed connection. Generally, when using this type of ISDN dial-up link, routing does not provide much extra benefit.

Network Organization, Structure and Physical L ayout

Some organizations are structured into departments determined by the physical layout of their work environment, so it is natural to divide the corporate network into separate logical networks. Routing becomes the obvious candidate for handling these individual LANs.

The Internet

The protocol adopted by the Defense Data Network (DDN) for the Internet, is based on obtaining and abiding by, a registered Internet address range. This makes a router the ideal choice for accessing the Internet. Unfortunately, new applicants are likely to only get a preventing more than 254 connections on one bridged IP LAN.

Class C

registered Internet address,

Routing IP and IPX

Running a bridged network allows workstations to communicate directly between one another. A PC user wishing to communicate with a remote network server is totally unaware of any intervening bridges. This is known as transparent operation.

Routing IP and IPX

A-7

Figure A-3

Example Network

A-8

RIDGING AND ROUTIN

It is important to understand that in a bridged network the addressing structure for both IP and IPX relates to a single network. If the units in were bridges and not routers, then an IP node on LAN A could, for example, have an address

140.56.10.0, the node on LAN B an address

140.56.10.2, and the node on LAN C, an address of

140.56.10.3. All the nodes, therefore, are able to share the same Class B network address, regardless of their location on the bridged network.

Figu re A-3

APPLICATION

File Transfer Protocol

(FTP)

Telnet

PRESENTATION

SESSION

Network

File Store

(NFS)

However, if there were NetWare nodes throughout the three bridged sites, they would also share the same IPX network number. If each of the bridged LANs supported a network ser ver, each with its own unique network number, and an IPX address is misconfigured, the NetWare network server consoles will report the message ‘Router Configuration Er ror – Router XXXXX c laim s that LAN i s XX-XX -XX-XX’. ( The router it refers to is in fact the network ser ver).

Figure A-4

(ICMP)

Transmission

Control

Protocol

(TCP)

Others

ARP

RARP

User

Database

Protocol

TRANSPORT

NETWORK

DATA LINK

PHYSICAL

(UDP)

Internet Protocol (IP) and

Internet Control Message Protocol

Link Level Control

Ethernet

Hardware

Open Systems Interconnection Network Layer Model

A routing environment allows stations to communicate indirectly. Following the example in

Figu re A-3

, let us assume that a station on LAN 1 wants to communicate with a network server on LAN 2. The station on LAN 1, constructs a

Layer 2

datalink header (see

Figu re A- 5

), with the source station’s hardware address, and also the destination hardware address of the local router. To direct the packet to its final network destination, the source station must complete the

Layer 3

network

header with the destination network address of LAN 2. Once the packet is received by the Router A,

attached to LAN 1, it strips off the network header (refer to

Figu re A- 5

) and examines the Layer 3 datalink header information. It then reviews its routing tables in order to establish where to forward the data packet. It is possible that the LAN 1 router has multiple outgoing ports that would allow different transmission routes to the destination network. In our example using

Figu re A- 3

, a packet could go via Router D to get to Router B, or it could go more directly across a single direct link between Router A and Router B.

Figure A-5

Data Packet Containing Hardware And Software Addresses

IP Routing

The local router contains, within its routing table, information which will allow it to determine the best data transmission route. The type of information the router uses to make these assessments is protocol dependent, and some communications protocols may employ a range of routing algorithms, and accompanying routing protocols. In the case of the TCP/IP protocol suite, the OfficeConnect Remote utilizes the Routing Information Protocol (RIP). RIP is also known as a

Routing IP and IPX

distance vector

A-9

protocol.

A-10

RIDGING AND ROUTIN

Different protocols use differing network characteristics or decisions. The metric employed by RIP is a

Count

. A hop count is defined by the number of

metrics

when making routing

Hop

routing nodes there are between the source and destination units. In our example, there are two hops between LAN1 and LAN 2 going via Routers A and B. If traffic was directed via Routers A, D, and then B, this would be three hops.

The algorithm will automatically select to forward the data packet via Router A, as this route contains the least number of hop counts which makes it the preferred direct route.

Every thirty seconds, each IP router will advertise via RIP datagrams, to all other routers on the internetwork, how many hops it takes to reach all connected logical networks, based on the routers network position and the state of its physical links. In an ISDN environment, making ISDN calls every thirty seconds to pass on and receive RIP updates would be costly. When initially setting up the network, the OfficeConnect Remote is manually connected over the ISDN for a three minute period, in order to learn the topology of the rest of the network. Once this has been performed the

OfficeConnect Remote will only make ISDN calls to transmit data packets. While this data transfer is in progress, RIP updates will be

piggybacked

on to the call, updating both parts of the network with the latest RIP information.

It is also possible to assign what are known as

routes

, which are manually entered fixed routes. The

static

network manager may be aware of specific traffic patterns, or needs to enforce a particular routing policy. Static routes provide an option to force traffic through the network in a particular way. The disadvantage with this approach is that routing protocols dynamically update all the routers on the network, with the current network topology, enabling backup routes to be deployed. In a static route situation, if the WAN links in that routing definition are down, then traffic cannot be passed. Implementing a static route prohibits the router from being able to offer alternative data paths.

Routing IP and IPX

A-11

IPX Routing

Novell IPX also uses RIP for routing purposes. Although it is similarly named to the IP equivalent, it uses a different protocol. IPX RIP broadcasts datagrams out onto the network every sixty seconds. Upon receipt of a RIP datagram, a router adds one to the hop count of each route advertised and broadcasts a RIP datagram to the other networks, with which it is connected.

The cost of a route in an IPX network is determined by the metric known as environment this is the hop count plus one, e.g. three hops or four ticks. For an internetwork connected via a WAN or ISDN links, the tick count is factored on the speed of the WAN link.

We saw above the common network numbering scheme employed for a bridged network. By employing routing, LAN A, LAN B and LAN C become three separate networks on a network. The network numbering must reflect that situation.

In a Novell IPX environment we could allocate IPX network numbers 00000111 to LAN A, 00000222 to LAN B and 00000333 to LAN C. Having configured

ticks

. In a LAN only

the ports of the OfficeConnect Remote to accept this protocol, routing will now occur between the remote network servers and workstations but addressed by different network numbers.

It should be noted that NetWare 3.X and later, uses the concept of internal IPX addresses, which is somewhat similar to network addressing. The internal address refers to the internal network within that server allowing internal processes to communicate. These numbers must be unique for all servers right across the network. Although network servers may appeared wired correctly, and in other respects seem to be working correctly, duplicated internal IPX addresses will not allow correct operation.

NetWare has a hop count limitation imposed by the RIP. On an IPX network a data packet can cross a maximum of fifteen routers before being discarded.

A-12

RIDGING AND ROUTIN

IP Addresses

TCP/IP Numbering and subnet masking IP numbers or

addresses

(normally called whole number value of between 0 and 255, and the bytes separated by a full stop. For example:

123.123.123.123

An IP address is divided into two sections, one is the

Network Address Address

123.123.|123.123

Network Host

The divider | between the two sections is moveable according to what address is defined by what the number is in the first address byte:

For a Class A IP address the number in the first byte

■

will be in the range 00 to 126 For a Class B IP address the numbers in the first &

■

second bytes will be in the range 128.001 to 191.254

are normally made up of four fields

bytes

), with each byte having a

section and the other is the

section. For example:

class

of IP address it is. The class of

Host

■

For a Class C IP address the numbers in the first, second & third bytes will be in the range 192.000.001 to 223.255.254

For example: Class A

Class B

Class C

1.|123.123.123

Network Host

128.001.|123.123

Network Host

192.123.123.|123

Network Host

Using of any of the address classes in a private TCP/IP network is not a problem, providing that connections outside of that private network to external public or private TCP/IP networks are never needed. If a private IP addressing number scheme is established within a private corporate network, connections out of that network to external public or other private TCP/IP networks, can be achieved via a computer which has software which enables it to act as an IP

gateway

. These devices, if configured correctly, provide the IP numbering/address translation between the two networks.

Routing IP and IPX

A-13

Subnet Masking

Subnet Masking is a mechanism which can be enabled in computer and communications equipment which tells the equipment and the network, which parts of the IP address are to be used as the

Network

identifier and which are the

Host

identifier. A subnet mask consists of a similar field structure to

that of the IP address (123.123.123.123). For example:

255.255.0.0

This means that the first two three digit bytes of the IP address (the fields

masked

by - 255.255) are to be recognized and used as the Network address, and the last two bytes (those set to .0.0) are to be used to identify the Host address.

An alternative way of expressing a subnet mask is a single number indicating how many bits of the IP address are to be used for the network address. For example 255.255.0.0 can be expressed as 16 while

255.255.255.192 can be expressed as 24. The OfficeConnect Remote can be configured to use

subnet masking to enable ISDN Autocalls to be made on groups of IP addresses or on specific IP addresses.

Normally, a subnet mask would be set so that any IP address, in a range of hosts on a destination LAN which are detected on the unit’s locally connected LAN port, causes an ISDN Autocall to be made out to that destination.

This is achieved by the addition of a

number at

/xx

the end of the configured address. For example:

193.123.123.123/32

The

appended to the IP number indicates that all

/32

four of the bytes are used and must have valid entries. A

mask, for example:

/24

193.123.123.0/24

means that only the first three bytes are to be recognized and used, and the last byte can be ignored. In this case, any IP address appearing on the locally connected LAN in the range 193.123.123.0 to

193.123.123.255 will cause an autocall to be made to the destination network who’s name is associated with that number in the ISDN Autocall table. The name is then looked up in the ISDN Numbers table and a call made to the ISDN number which has been assigned to that name.

A-14

RIDGING AND ROUTIN

Obtaining an IP Address

If you want to use a unique IP addressing system on your network so you can connect to the Internet, there are three organizations responsible for allocating network addresses. These details are correct at the time of printing but may change.

■

info@internic.net (automatic mail service for general enquiries)

refdesk@is.internic.net

■

(enquiries not handled by the services above).

Europe -RI PE

USA - InterNIC, Network Solutions

Attention:

InterNIC Registration Services 505 Huntmar park Drive Herndon VA 22070

Telephone:

1-800-444-4345 (Toll Free) 1-619-455-4600

1-703-742 4777 You can also send e-mail to these addresses: hostmaster@rs.internic.net

■

(host, domain, network changes and updates) action@rs.internic.net

■

(computer operations) mailserv@rs.internic.net

■

(automatic mail service)

Attention:

RIPE NCC Kruislaan 409 NL-1098 SJ Amsterdam The Netherlands

Telephone: Fax: e-mail:

+31 20 592 5065 +31 20 592 5090 ncc@ripe.net

Asia Pacific Network Information Center (APNIC-DOM)

Attention:

Asia Pacific Network Information Center (APNIC-DOM) c/o Comp uter Ce nter University of Tokyo 2-11-16 Yahoi Bunkyo-ku, Tokyo 113 Japan

Numbered and Unnumbered Links

A-15

Admin. Contact: Telephone: e-mail:

Technical Contact: Telephone: Fax: e-mail:

Nakayama, Masaya (MN89) +81 3 3812 211 ext2720 nakayama@nic.ad.jp

Conrad, David (DC296) 81 3 3580 3781 or 3580 81 3 3580 3782 davidc@apnic.net

Numbered and Unnumbered Links

When routing and using the OfficeConnect Remote’s FastConnect protocol over ISDN or serial WAN links as opposed to PPP, you have the option of using numbered or unnumbered links.

A numbered link requires a valid IP address to be configured for both ports connected to each end of the link. The IP address used must be for a different subnet or network than that used by either LAN at each end of the link. An example is shown in

A-6

. In this example, the Local Site uses the network address 191.000.100.xxx on its LAN. The remote site uses the network address 191.000.200 on its LAN and the link uses 191.000.300.

Figu r e

Figure A-6

By default the WAN port and ISDN port have an IP address of 10.0.0.1. This is set to allow remote Telnet connections to the unit to enable configuration but must be changed when configuring the unit to allow correct operation. If you use the (QC) option to configure the unit to operate over ISDN, the Port IP Address is set to unnumbered.

In most instances you should use unnumbered links. This is easier to configure and does not use network addresses which may be in short supply.

Example of a Numbered Link

Quick Configuration

A-16

RIDGING AND ROUTIN

ECHNICA

Specifications

LAN Connector Interfaces

10Base2 via a coaxial connector.

■

10BaseT via an RJ45 connector socket for UTP.

■

Only one LAN connection can be used at a time

WAN Connector Interface

25-way D-type female connector, configured to support one of:

V.11 (X.21) for speeds up to 2.048 Mbps.

■

V.28 (V.24/RS232) for speeds up to 19.2 Kbps.

■

V.35/V.36 for speeds up to 2.048 Mbps.

■

ISDN Connector Interface

Provides a twin interface to a 2B+D basic rate ISDN service, via an RJ45 connector socket.

L INFORMATIO

Voice Connector Interface

Provides interface for analog telephony equipment via RJ11 connector socket. Adaptors may be required for some telephone equipment connections.

Management Connector Interface

9-way D-type connector for use with a VT100 compliant terminal or PC.

Local and remote terminal management.

■

TCP/IP Telnet menu driven management interface for

■

remote management. Software upgrades, enhancements and

■

configurations downloadable from network attached terminal or PC.

SNMP MIB II support with private extensions for

■

management of unique features.

B-2

ECHNICA

L INFORMATIO

Bridge Characteristics

802.3 MAC layer bridge.

■

802.1D spanning tree algorithm.

■

Support for bridge triangulation and link load

■

sharing.

Performance

LAN filtering rate: 10000 frames per second.

■

LAN forwarding rate: 4000 frames per second.

■

ISDN and WAN forwarding rates are dependent on the link speed.

Approvals

The WAN port must be attached to a screened digital

■

cable. The ISDN cable must be used in conjunction with a

■

three turn ferrite. The product carries the CE certification mark to

indicate conformance with the following EU directives: LVD (Low Voltage Directive (Safety) 73/23/EEC.

■

EMC (Electro Magnetic Compatibility) Directive

■

89/336/EEC. TTE ( Telecommunication Terminal Equipment)

■

Directive 91/263/EEC. The product conforms to I-CTR3 (based on NET3 –

ISDN interface).

FCC Requirement

This product has been verified to comply with the limits of Class B computing device pursuant to Subpart J of Part 15 of the FCC Rules.

WARNING:

frequency energy and, if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio or television reception.

The product has been tested and found to comply with the limits for a Class B computing device in accordance with the specifications of Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference in a residential installation. However, the is no guarantee that interference will not occur in a particular installation.

If this equipment does cause 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:

This product generates and uses radio

Approvals

■

Reorientate the receiving antenna.

■

Relocate the product away from the receiver. Plug the unit into a different outlet so that the

■

computer and the receiver are in different branch circuits.

Ensure that all product fixing screws, attachment

■

connector screws and ground wires are tightly secured.

If necessary, consult your dealer, service representative, or an experienced radio/television technician for additional suggestions.

The manufacturer is not responsible for any radio or television interference caused by unauthorized modifications to the product. It is the responsibility of the user to correct such interference.

You must use shielded interface cables and a ferrite in order to maintain compliance with the limits for a Class B device.

CAUTION:

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the product.

B-3

B-4

ECHNICA

Dimensions

L INFORMATIO

Interface Cable Characteristics

B-5

Interface Cable Characteristics

WAN Port Connecting Cable – V.11/X.21 Support

The WAN port terminates with a 25-way D-type female connector. The port can be configured to support V.11 signalling characteristics at data transfer rates up to 2.048 Mbps. The WAN port connecting cable is not supplied with the unit. The following signalling characteristics should be observed when purchasing or fabricating a suitable cable.

Pin Links

3Com end pin no.

(25-way male) 2 3 7

12 13 14 15 16 17 19 23 24

Signal name

Transmit Data A (TXDA) Receive Data (RXDA) Signal Ground (Receive

Data) Signal Ground Indicate B (INDB) Transmit Data B (TXDB) Indicate A (INDA) Receive Data B (RXDB) Clock A (CLKA) Clock B (CLKB) Control B (CTRLB) Control A (CTRLA)

Client end pin no.

(15-way male D-type connector)

2 4 8

12 9 5 11 6 13 10 3

B-6

ECHNICA

L INFORMATIO

WAN Port Connecting Cable – V.24/V.28 Support

The WAN port terminates with a 25-way D-type female connector. The port can be configured to support V.24 or V.28 signalling characteristics at data transfer rates up to 19.2 Kbps. The WAN port connecting cable is not supplied with the unit. The following signalling characteristics should be observed when purchasing or fabricating a suitable cable.

Pin Links

3Com end pin no.

(25-way male D-type connector)

2 3 4 5 6

Signal name

Transmit Data (TXD 103) Receive Data (RXD 104) Request To Send (RTS 105) Clear To Send (RTS 106) Data Set Ready (DSR 107)

Client end pin no.

(25-way male D-type connector)

2 3 4 5 6

Pin Links

3Com end pin no.

(25-way male D-type connector)

7 8

11 12 15

17 18 20

22 24

Signal name

Signal Ground (102) Data Carrier Detect (DCD

109) Signal Ground (AutoSense) Signal Ground (AutoSense) Transmit Clock (TXCLK

114) Receive Clock (RXCLK 115) Analog Loop Test (141) Data Terminal Ready (DTR

108) Remote Digital Loop Test

(140) Ring Indicator (RI 125) External Clock (EXCLK)

If clock signals are required, connect Pin 24 to Pins 15 & 17 at the 3Com end only.

Client end pin no.

(25-way male D-type connector)

7 8

17 18 20

Interface Cable Characteristics

B-7

WAN Port Connecting Cable – V.35/V.36 Support

The WAN port terminates with a 25-way D-type female connector. The port can be configured to support V.36 signalling characteristics at data transfer rates up to 48 Kbps. The WAN port connecting cable is not supplied with the unit. The following signalling characteristics should be observed when purchasing or fabricating a suitable cable.

Pin Links

3Com end pin no.

(25-way male) 2 3 4

5 6

Signal name

Transmit Data (TXD 103) Receive Data (RXD 104) Request To Send (RTS

105) Clear To Send (RTS 106) Data Set Ready (DSR 107)

Client end pin no.

(34-way MRAC connector)

P R C

D E

Pin Links

3Com end pin no.

(25-way male) 7

11 13

Signal name

Signal Ground (102)(Clear To Send)

Data Carrier Detect (DCD

109) Signal Ground Serial Clock Transmit B

(SCTB 114) Transmit Data B (TXDB

103) Serial Clock Transmit A

(SCTA 114) Receive Data B (RXDB

104) Serial Clock Receive A

(SCRA 115) Serial Clock Receive B

(SCRB 115) Data Terminal Ready (DTR

108)

Client end pin no.

(34-way MRAC connector)

B-8

ECHNICA

L INFORMATIO

Manager Port Connecting Cable

The manager port cable terminates with a 9 pin female connector at one end and a 9-pin male/female D-type connector or 25-pin D-type male/female connector. The pin-out tables below show the pin outs for both variants.

3Com end pin no.

(9-way male connector)

Shell 3 2 5 7

8 6 1 4

Signal Name

Screen TxD RxD Ground RTS

(not connected)

CTS DSR DCD DTR

Pin Links

Signal Name

Screen RxD TxD Ground RTS

(not connected)

DTR CTS DSR DCD

Terminal or Com port end pin number

(9-way male/female connector)

Shell 2 3 5 7

4 8 6 1

3Com end pin no.

(9-way male connector)

Shell 3 2 5 7

8 6 1 4

Signal Name

Screen TxD RxD Ground RTS

(not connected)

CTS DSR DCD DTR

Pin Links

Signal Name

Screen RxD TxD Ground RTS

(not connected)

DTR CTS DSR DCD

Terminal or Com port end pin number

(25-way male/female connector)

1 3 2 7 4

20 5 6 8

Interface Cable Characteristics

B-9

Modem Cable

If you want to connect to the manager port using a modem, you will need a cable as shown in the table below. This connects the manager port’s 9 pin D-type connector to a 25-pin serial port on a modem.

3Com end pin no.

(9-way male connector)

Shell 3 2 7 8 6 5 1 4

Signal Name

Screen TxD RxD RTS CTS DSR Ground DCD DTR

Pin Links

Signal Name

Screen TxD RxD RTS CTS DSR Ground DCD DTR

Terminal or Com port end pin number

(25-way male/female connector)

1 2 3 4 5 6 7 8 20

LAN Port Connecting Cable - 10BaseT

The 10BaseT port terminates with an RJ45 connector which can be connected to the 10BaseT port on another device. The table below shows the pin-outs for a straight through cable.

3Com end pin no.

(RJ45)

Links

1 2 3 4 5 6 7 8

Signal name

TxD+ TxDRxD+ not used not used RxDnot used not used

Client end pin no.

(RJ45) 1

2 3 4 5 6 9 10

B-10

ECHNICA

L INFORMATIO

Ordering Information

3C410000 3C410005 3C4100010 3C4100015 3C4100020 3C4100025

3C16740 3C16741 3C16742 3C16743 3C16744 3C16745

731/000036

socket, gender changer (Serial Management por t cable).

731/000024

3 meters of cable.

733/000028

UTP cable (ISDN cable).

733/000001

UTP cable (ISDN cable).

OfficeConnect Remote 510s OfficeConnect Remote 520s OfficeConnect Remote 530s OfficeConnect Remote 510u OfficeConnect Remote 520u OfficeConnect Remote 530u

Power adapter (US) Power adapter (UK) Power adapter (Mainland Europe) Power adapter (Japan) Power adapter (Australasia) Power Adapter (South Africa)

9-pin D-type plug to 9-pin D-type

9-pin D-type plug to RJ45 plug, with

RJ45 to RJ45 plug, with 1.5 meters of

RJ45 to RJ45 plug, with 3 meters of

3C409000

25-pin to 25-pin D-type plug, with 3

meters of cable (V.24).

3C409001

25-pin D-type plug to 34-way MRAC

connector, with 3 meters of cable (V.35).

3C409004

25-pin to 15-pin D-type plug, with 3

meters of cable (X.21).

733/000026

British Telecom socket to RJ11

converter (UK only).

980/000033

OfficeConnect Remote User Guide.

LOSSARY

10Base2

protocol at 10 Mbps over thin Ethernet cable.

10Base5

protocol at 10 Mbps over thick Ethernet cable.

10BaseT

protocol at 10 Mbps over unshielded twisted-pair cable (the T stands for twisted pair).

100BaseVG

802.12 protocol at 100 Mbps over unshielded twisted-pair cable of type 5 or type 3.

100BaseT

protocol at 100 Mbps over unshielded twisted-pair cable. IEEE standards approval pending.

802.3

specifies a CSMA/CD protocol. This is the standard protocol used for Ethernet. Refer to

Address

workstation connected to the LAN.

An IEEE standard for using IEEE 802.3

An IEEE standard for using the new IEEE

A proprietary standard for using IEEE 802.3

An IEEE standard for the physical layer that

CSMA/CD

The unique code assigned to each device or

Age

The process of removing an address from the unit’s filtering database after the device has not transmitted for a given period of time.

ANSI

American National Standards Institute.

Application layer

of the OSI network layer model. This layer contains the user and application programs.

ASCII

American Standard Code for Information Interchange, a standard that defines the values that are used for letters, numbers, and symbols.

Attenuat ion

signal as it travels through a cable.

AUI

Attachment user interface, the interface between the unit and the data terminal equipment, usually in the form of a connecting cable.

Layer seven, the uppermost part

The progressive degradation of a

C-2

HAPTE

LOSSARY

B Channel

A digital data communications channel running at 64 Kbps. The basic rate ISDN 2 service carries two B channels plus one control D channel. Refer to

Backbone

ISDN

and

D Channel

A network cabling segment that interconnects a group of network segments or systems.

Bandwidth

The capacity of data communications

system or channel.

Baseband

A communication technique in which network cable is used to carry a single stream of data at a time.

A unit of signalling speed equal to the

Baud

number of signalling events in one second.

Either of the digits 0 or 1 when used in the binary

Bit

numeration system. Eight bits equals a single byte.

A device that links two or more local or

Bridge

remote area networks together. A bridge may be used to extend the network or to connect two different network transport technologies together.

Broadband

A communications technique in which network cabling is used to carry multiple streams of data simultaneously.

Broadcast Storm

A rare event in which broadcast frames are propagated endlessly through the network because poorly configured bridge and router connections.

A single segment through which devices are

Bus

connected. An Ethernet LAN is based on a bus network which connects all communicating workstations with a common cable.

A string that consists of eight data bits treated

Byte

as a unit.

Call Guillotine

A feature that disconnects a call after a certain period of time irrespective of whether data is being passed across the link or not.

Comité Consultatif International

CCITT

Téléphonique et Télégraphique, now renamed ITU, International Telecommunication Union.

C-3

Challenge Handshake Authentication

CHAP

Protocol. Part of the PPP protocol to ensure authentication of the connection between two devices.

Type of IP address. IP addresses fall into three

Class

main classes, A, B and C.

A user whom is making use of a particular

Client

system resource or peripheral through a workstation attached to a local or wide area network.

Client/server

A user who is attached to a file server to recover and store files, but the processing of the data or use of an application is carried out on the client machine.

Coaxial cable

A twin-conductor cable used for computer networking, in either a thick or thin form. This cable consists of a centre core wire (stranded or single core) covered by insulation, a second conductor of woven wire, and an external covering of rubber. Thin coaxial cable resembles television cable. Thick coaxial cable has an increased diameter outer bore and is often yellow or orange in color.

CSMA/CD

Carrier Sense Multiple Access with Collision Detection, the Ethernet protocol that allows each device to create and send its own data packets. CSMA/CD is used to avoid excessive collisions between packets as they are randomly transmitted. A CSMA/CD device first listens for other carriers, if it detects no other carriers, it will then allow the data packet to be transmitted. If a collision is detected, the device stops transmitting, waits a random length of time, and begins transmitting again.

D Channel

A control channel carrying signalling information, running at 16 Kbps. The basic rate ISDN 2 service carries two B channels plus one control D channel. Refer to

Characters or code either entered by the user

Data

ISDN

and

B Channel

or passed between devices that are part of the computer or network.

Data communications

The transfer of data via transceiver equipment by means of data transmission according to a protocol. Refer to

Protocol

C-4

HAPTE

LOSSARY

Datagram

A message that is sent from one computer or device to another to confirm it location or status on a network.

Data link layer

The second layer of the OSI reference model. This layer is responsible for controlling message traffic.

Data packet (packet)

A sequence of binary digits, including data and control signals that is transmitted across a LAN or WAN.

Data circuit-terminating equipment.

DCE

Data Terminal Equipment. The physical

DTE

interface and link access procedures between DTE and data circuit-terminating equipment (DCE).

Dial tone multi-frequency, the signalling

DTMF

system used by PSTN. Refer to

Downloading

A user initiated transfer of data from a

PSTN

server to the user’s own workstation. Also used to classify the transfer of files from one system to another, usually to upgrade or revise system software.

Erasable programmable read-only memory.

EPROM

A chip whose memory can be erased and reused.

Ethernet

A 10 Mbps baseband local area network

protocol, compatible with IEEE 802.3 standards.

FastConnect

The OfficeConnect Remote’s proprietary connection protocol that allows fast connection between units either over the ISDN link or over a permanent leased line WAN link.

Fiber optics

A technology that uses laser light pulses, sent over thin glass fibres, which is able to deliver data at speed up to several gigabits per second.

File s er ve r

A computer running a special operating

system that allows workstations to access files.

A configuration that removes types of data

Filte r

frames based on user-entered parameters.

Firewa ll

A method of preventing unauthorized access to a network or a host on a network. A firewall is usually implemented within a router’s software.

C-5

The method by which a data packet is

Frame

constructed to be sent across a network. Usually assembled with header and footer information.

Gateway HDLC

Another name for a router on a network.

High-level Data Link Control. OSI’s bit

orientated protocol.

Hop count

The number of routing nodes between a

source and destination device on a LAN or WAN.

A device or computer on an IP network to

Host

which you can connect.

A cabling centre in a star topology that either

Hub

amplifies a signal and transmits it (active hub) or simply passes the signal along (passive hub).

Hyperterminal

The terminal emulation program

provided with Microsoft Windows 95™.

The Institute of Electronic and Electrical

IEEE

Engineers.

Internetwork Packet Exchange, the default data

IPX

packet protocol for Novell’s NetWare operating system.

Integrated Services Digital Network. A

ISDN

multi-channel digital end-to-end telecommunications network that provides a virtually error free transmission of data.

International Standards Organization. Refer to

ISO

Open Systems Interconnection

A measurement of data transmission speed in

Kbps

kilo bits per second.

Keep alives

A message sent by one network device to inform another network device that the virtual circuit between them is still active.

Local area network, a network that covers a

LAN

group of local workstations and peripherals that require to share information.

A bridge learns addresses received at any of its

Learn

interfaces and adds them to its filter address table.

Medium access control, a protocol for

MAC

determining which device has access to the network at any one time.

A measurement of data transmission speed in

Mbps

megabits per second.

C-6

HAPTE

LOSSARY

Metropolitan area network, a network that

MAN

covers a city.

Management information base.

MIB NETBIOS

Network Basic Input/Output System, a standard for supporting network communications that is independent of the underlying network transport type.

NetWare

Novell’s Network Operating System (NOS) line.

Network

A method of connecting computers and other devices together with cabling so that they can communicate with each other.

Network interface card, an expansion card that

NIC

enables a PC to communicate on a network.

Network layer

The third layer of the OSI reference model. This layer is responsible for controlling message traffic.

A network file system developed by Sun

NFS

Microsystems for shared files over a UNIX platform.

An alternative name for a computer or device

Node

(such as a printer or modem) that is connected to a network.

Network operating system.

NOS

Open Systems Interconnection, a body of

OSI

standards set by the International Standards Organization to define the activities that must occur when computers communicate. There are seven layers, and each contains a specific set of rules to follow at that point in the communication.

Password Authentication Protocol. Part of the

PAP

PPP protocol to ensure authentication of the connection between two devices.

Peer-to-peer network

A network which contains workstations which are able to act as both client and client servers.

Piggyback

A way of transmitting routing information over ISDN lines by adding it to valid data frames. This avoids ISDN calls being generated solely for passing routing information.

C-7

Physical l ayer

The first layer of the OSI network layer model. This layer manages the transfer of individual bits of data over wires, or whatever medium, that is used to connect workstations and peripherals.

A method of controlling terminals on a

Polling

multi-point network where each device is interrogated, in turn, to determine if the device is ready to receive or transmit data.

Point-to-Point Protocol. The de facto standard

PPP

protocol for routing between devices made by different manufacturers.

Presentation layer

The sixth layer of the OSI network layer model. This layer controls the formatting and translation of data.

Protocol

A set of rules and procedures that govern the exchange of data between two communicating systems.

Public switched telephone network.

PSTN Quick Configuration

A set of menu driven forms in the management system that allow you to configure the unit for most types of ISDN connection.

Ringer equivalence number.

REN

Routing information protocol.

RIP

A protocol transparent device that links

Router

networks. A router can be used to separate unwanted traffic on either side of the bridge, reduce the traffic, or to provide security from unauthorized users.

Source address protocol.

SAP Segment

A section of an Ethernet network, typically connected by repeater or a bridge to another segment.

Sequenced Packet Exchange, Novell’s

SPX

guaranteed-delivery version of IPX.

Session

A logical connection between two communicating systems that allows for the transfer of data.

Session layer

The fifth layer of the OSI network layer model. This layer is responsible for the security and administrative tasks of communicating.

C-8

HAPTE

LOSSARY

Simple network management protocol, a

SNMP

software program to allow the remote management of bridge and routing devices.

Static Route

A route you have entered and made permanent rather than a route that the unit has learned by connecting to other routers.

Spanning tree protocol, a protocol which

STP

prevents network loops.

Terminal

The Microsoft Windows™ terminal

emulation program.

Terminators

Devices that are used at the ends of a linear bus network segment to reflect the signal back and prevent failure of the segment.

Transmission control protocol/Internet

TCP/ IP

protocol, a set of communication protocols that support peer-to-peer connectivity functions for both local and wide area networks.

Thick Ethernet

A cabling system for Ethernet connections that uses a heavyweight coaxial cable. Suitable for large networks.

Thin Ethernet

A cabling system for Ethernet connections that uses a lightweight coaxial cable. Suitable for small networks.

A measurement of the time taken to pass

Ticks

information through a routed network.

Token Ring

A network transport technology in which an electronic token that allows access to the network is passed around stations in the ring.

Topology

The way that a network is physically laid

out.

Transport layer

The fourth layer of the OSI network layer model. This is responsible for error checking and correction, and some message flow control.

Wide area network, a network that covers a wide

WAN

area and requires special communication devi ces (bridges and/or routers) to make connection possible. WANs make connections over long distances and need telephone, satellite, or microwave equipment to allow connections to be made.

Workstation

Another name for a computer or device (such as a printer or modem) that is connected to a network.

ECHNICA

UPPOR

3Com provides easy access to technical support information through a variety of services. This appendix describes these services.

On-line Technical Services

3Com offers worldwide product support seven days a week, 24 hours a day, through the following on-line systems:

3Com Bulletin Board Service (3ComBBS)

■

World Wide Web site

■

3Com Bulletin Board Service

3ComBBS contains patches, software, and drivers for all 3Com products, as well as technical articles. This service is available via modem or ISDN seven days a week, 24 hours a day.

Access by Modem

set your modem to 8 data bits, no parity, and 1 stop bit. Call the telephone number nearest you:

To reach the service by modem,

Countr y

Australia France Germany

Hong Kong Italy (fee required) Japan Singapore Taiwan U.K. U.S.

Access by ISDN

using a digital modem for fast access up to 56kbps. To access 3ComBBS using ISDN, dial the following number:

Data Rate

up to 14400 bps up to 14400 bps up to 9600 bps

up to 9600 bps up to 14400 bps up to 9600 bps up to 14400 bps up to 14400 bps up to 14400 bps up to 14400 bps up to 14400 bps

ISDN users can dial-in to 3ComBBS

(1) (408) 654 2703

Telephone Number

(61) (2) 9955 2073 (33) (1) 69 86 69 54 (49) (89) 627 32 188

(49) (89) 627 32 189 (852) 2537 5601 (39) (2) 273 00680 (81) (3) 3345 7266 (65) 534 5693 (886) (2) 377 5838 (44) (1442) 278278 (1) (408) 980 8204

D-2

ECHNICA

L SUPPOR

World Wide Web Site

Access the latest networking information on 3Com’s World Wide Web site by entering our URL into your Internet browser:

http://www.3com.com/

This service features news and information about 3Com products, customer service and support, 3Com’s latest news releases, selected articles from 3TECH™ (3Com’s award-winning technical journal) and more.

Support from Your Network Supplier

■

A list of system hardware and software, including revision levels.

Details about recent configuration changes, if

■

applicable. If you are unable to contact your network supplier,

see the following section on how to contact 3Com.

Support from 3Com

If you are unable to receive support from your network supplier, technical support contracts are available from 3Com.

If additional assistance is required, contact your network supplier. Many suppliers are authorized 3Com service partners who are qualified to provide a variety of services, including network planning, installation, hardware maintenance, application training, and support services.

When you contact your network supplier for assistance, have the following information ready:

Diagnostic error messages.

■

In the U.S. and Canada, call

(800) 876-3266

for

customer service. If you are outside the U.S. and Canada, contact your

local 3Com sales office to find your authorized service provider:

Country

Australia (Sydney)

(Melbourne)

Telephone Number

(61) (2) 959 3020 (61) (3) 653 9515

Returning Products for Repair

D-3

Country

Belgium Brazil Canada Denmark* Finland* France* Germany* Hong Kong Ireland* Italy* Japan Mexico Netherlands* Norway* Singapore South Africa Spain* Sweden* Taiwan United Arab Emirates

Telephone Number

0800 71429 (55) (11) 546 0869 (905) 882 9964 800 17309 0800 113153 05 91 79 59 0130 821502 (852) 868 9111 1 800 553117 1678 79489 (81) (3) 3345 7251 (525) 531 0591 06 0227788 80013376 (65) 538 9368 (27) (11) 803 7404 900 983125 120 795482 (886) (2) 577 4352 (971) (4) 349049

Country

U.K.* U.S.

* These numbers are toll free

Telephone Number

0800 966197 (1) (408) 492 1790

Returning Products for Repair

A product sent directly to 3Com for repair must first be assigned a Return Materials Authorization (RMA) number. A product sent to 3Com without an RMA number will be returned to the sender unopened, at the sender’s expense.

To obtain an RMA number, call or fax:

Country

U.S. and Canada Europe Outside Europe,

U.S. and Canada

Telephone Number

(800) 876 3266, option 2 31 30 60 29900 (option 5) (1) (408) 492 1790

Fax Number

(408) 764 7120 (44) (1442) 275822 (1) (408) 764 7290

D-4

ECHNICA

L SUPPOR

NDE

Numerics

10Base2 10BaseT

3Com Bulletin Board Service 3Com sales offices

1-9

connections connections

crossover port

1-9

(3ComBBS)

1-14 1-13

1-9

D-1

D-2

ALERT LED

1-6

bridging and routing concepts bulletin board service

D-1

clipping hubs together clips

1-11 coaxial cable commands

IN IPB

1-9

1-25

1-22

1-11

A-1

IPR

1-23

1-20

1-21

1-18 concepts - bridging and routin g configuring your unit connecting

to a PC connecting telephony equipment connecting to

contents checklist crossover switch

1-9

Internet

IP hosts on different networks

IP hosts on same network

Novell networks

WAN leased line link

1-25

1-17

1-25

1-22

1-21

1-28

1-4

1-9

default password

1-18

Ethernet

10Base2 port

10BaseT port example networks

1-14 1-9,

1-13

1-30

A-1

1-16

1-23

feet

1-11

front panel LEDs

1-6

hub

clipping

1-11

installation

10Base2 connections 10BaseT connections ISDN connection management terminal connection power adapter pre-requisites siting the unit voice port connection wall mounting

ISDN

connection

port ISDN OK LED ISDN1 LED ISDN2 LED

1-9

1-10

1-7 1-7

1-7

1-5

1-5,

1-12

1-10

1-12

1-9,

1-14

1-13

1-15

1-16

1-15

1-16

LAN

10Base2 connections 10BaseT connections 10BaseT port

LEDs

Alert ISDN OK ISDN1 ISDN2 LINK STATE Network Utilization POWER SERIAL WAN VOICE

LINK STATE LED

1-9

1-6

1-7 1-7 1-7

1-7

1-6

1-7

management

configuring your unit port

1-8

MDI/MDIX switch

1-9

network supplier support Network Utilization LEDs

1-14

1-13

1-17

D-2

1-7

on-line technical services

D-1

package contents password power adapter power inlet POWER LED PPP routers problem solving

1-4

1-18

1-12

1-8

1-6

1-25

1-36

Quick Configuration

1-17

rear panel

10BaseT port ISDN port power socket reset button serial port voice port

WAN port rear panel connections registration card reset button returning products for repair rubber feet

1-9

1-8

1-10

1-9

1-8

1-5

1-8

1-11

D-3

serial port SERIAL WAN LED setting up your unit siting the unit stacking clips

1-8

1-10

1-11

technical support troubleshooting

unit name

1-20

VOICE LED voice port VT100

terminal connection

1-7

1-10

wall mounting WAN

connection port

WAN configuration

1-12

1-9

1-7

1-17

1-5

1-36

1-16

1-28

LIMITED WARRANTY

HARDWARE:

3Com warrants its hardware products to be free from defects in workmanship and materials, under normal use and service, for the following lengths of time from the date of purchase from 3Com or its Authorized Reseller:

Internetworking products Network adapters

One year

Lifetime Ethernet stackable hubs and Unmanaged Ethernet fixed port repeaters

Lifetime* (One year if not registered) *Power supply and fans in these stackable hubs and unmanaged repeaters Other hardware products Spare parts and spares kits

One year

90 days If a product does not operate as warranted during the applicable warranty

period, 3Com shall, at its option and expense, repair the defective product or part, deliver to Customer an equivalent product or part to replace the defective item, or 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. Any replaced or repaired product or part has a ninety (90) day warranty or the remainder of the initial warranty period, whichever is longer.

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 pursuant to any warranty.

SOFTWARE:

3Com warrants that the software programs licensed from it will perform in substantial conformance to the program specifications therefor for a period of ninety (90) days from the date of purchase from 3Com or its Authorized Reseller. 3Com warrants the magnetic media containing software against failure during the warranty period. No updates are provided. 3Com's sole obligation hereunder shall be (at 3Com's discretion) to refund the purchase price paid by Customer for any defective software products, or to replace any defective media with software which substantially conforms to 3Com's applicable published specifications. Customer assumes responsibility for the selection of the appropriate applications program and associated reference materials. 3Com makes no warranty that its software

products will work in combination with any hardware or applications software products provided by third parties, tha t 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 prov ide compatibility, except where the non-compatibility is caused by a “bug” or defect in the third party's product.

STANDARD WARRANTY SERVICE:

Standard warranty service for hardware products may be obtained by delivering the defective product, accompanied by a copy of the dated proof of purchase, to 3Com's Corporate Service Center or to an Authorized 3Com Service Center during the applicable warranty period. Standard warranty service for software products may be obtained by telephoning 3Com's Corp orate Service Center or an Aut horized 3Com Service Center, within the warranty period. Products returned to 3Com's Corporate Service Center must be pre-authorized by 3Com wit h a Return Material Authorization (RMA) number marked o n the outside of the package, and sent prepaid, insured, and packaged appropriately for safe shipment. The repaired or replaced item will be shipped to Customer, at 3Com's expense, not later than thirty (30) days after receipt by 3Com.

WARRANTIES EXCLUSIVE:

IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, CUSTOMER’S SOLE REMEDY SHALL BE REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM’S OPTION. THE FOREGOING WARRANTIES AND REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, STATUTORY OR OTHERWISE, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 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.

FFICECONNEC

UPPLEMENTAR

OfficeConnect Remote 531

The OfficeConnect Remote 531 provides the same functionality as the OfficeConnect 530, with the additional on-board memory allowing more sophisticated software (such as that provided by the OfficeConnect Remote /A software upgrade) to be installed in the unit.

Follow the OfficeConnect Remote 530 installation instructions described in the

OfficeConnect Remote Software Reference

information is required.

OfficeConnect Remote User Guide

EMC Update

he statement on page 4 of the

OfficeConnect Remote User Guide

used in conjunction with a three turn ferrite to meet Class B of EN 55022, no longer applies.

T REMOTE Y INFORMATIO

. Refer to the

if further configuration

About This Guide

, stating that the ISDN cable must be

section in the

Part Number: 981-000077/001

3COM 520, 530, 510 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction

How to Use This Guide

Conventions

Additional Safety Information

Introduction

OfficeConnect Remote Features

Benefits of ISDN

Using ISDN to Support Leased Line WAN Circuits

Pack Contents Checklist

Pre-installation Requirements

Fron t Pa ne l

Rear Panel

Installation

Using the Rubber Feet and Stacking Clips

Wall Mounting the OfficeConnect Remote

Connecting to Your 10BaseT LAN

Connecting to a Single Workstation

Connecting to Your 10Base2 LAN

Connecting to ISDN

Connecting to the WAN

Connecting to the VOICE Port

Connecting a Management Terminal

Location of OfficeConnect Fax and Print Servers

Quick Configuration

Starting Quick Configuration

Example Using Windows 3.1 Terminal Application

About Quick Configuration

Setting the Unit Name

Connecting to a Novell (IPX) Network

Connecting to an IP Host on the Same IP Network

Connecting to the Internet or a PPP Router

Monitoring ISDN Line Usage

Setting Up a WAN Link

Examples of Typical ISDN Networking Applications

Novell Network

IP Host on the Same IP Network

IP Host on Another IP Network

Internet or PPP Router

Multiple Connections from a Single Site

Troubleshooting

Introduction

Bridging and Routing Concepts

Guidelines For Choosing Bridging or Routing

How Bridges Learn

Bridging Between Remote Sites

Building a Larger Network

Multiple Paths Between Bridged LANs

Network Topology

Broadcast Storms

Optimum Use of Resource

The Internet

Routing IP and IPX

IP Routing

IPX Routing

IP Addresses

Subnet Masking

Obtaining an IP Address

Numbered and Unnumbered Links

Specifications

LAN Connector Interfaces

WAN Connector Interface

ISDN Connector Interface

Voice Connector Interface

Management Connector Interface

Bridge Characteristics

Performance

Approvals

FCC Requirement

Dimensions

Interface Cable Characteristics

WAN Port Connecting Cable – V.11/X.21 Support

WAN Port Connecting Cable – V.24/V.28 Support

WAN Port Connecting Cable – V.35/V.36 Support

Manager Port Connecting Cable

Modem Cable

LAN Port Connecting Cable - 10BaseT