3COM 3C16710 User Manual

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F F I C E

U S E R

U I D

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Part No. DUA1671-0AAA03

3C16710

O N N E C T

U B

8/TPM

Published October 1997

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3Com Corporation

© 3Com Technologies, 1997. All rights reserved. No part of this 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 from 3Com Technologies. 3Com Technologies reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Technologies to provide notification of such revision or change. 3Com Technologies provides this documentation without warranty of any kind, either implied or expressed, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. 3Com may make improvements or changes in the product(s) and/or the program(s) described in this documentation at any time.

UNITED STATES GOVERNMENT LEGENDS:

If you are a United States government agency, then this documentation and the software described herein are provided to you subject to the following restricted rights:

For units of the Department of Defense:

Legend:

Use, duplication or disclosure by the Government is subject to restrictions as set forth in subparagraph (c) (1) (ii) for restricted Rights in Technical Data and Computer Software clause at 48 C.F.R. 52.227-7013. 3Com Technologies, c/o 3Com Centre, BoundaryWay, Hemel Hempstead, Herts, HP27YU, UK.

■

5400 Bayfront Plaza

Restricted Rights

■

Santa Clara, California

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 Unpublished rights reserved under the copyright laws of the United States.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 media in a directory file named LICENSE.TXT. If you are unable to locate a copy, please contact 3Com and a copy will be provided to you.

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

3Com, OfficeConnect, NetAge, SmartAgent and Transcend are registered trademarks of 3Com Corporation. 3ComFacts and Ask3Com are service marks of 3Com Corporation .

CompuServe is a registered trademark of CompuServe, Inc. Windows is a registered trademark of Microsoft Corporation. VT100 is a registered trademark of Digital Equipment Corporation.

■

95052-8145

Restricted Rights Legend:

Use, reproduction

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

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C O N T E N T S I M P O R T A N T S A F E T Y I N F O R M A T I O N W I C H T I G E S I C H E R H E I T S H I N W E I S E L’ I N F O R M A T I O N D E S É C U R I T É I M P O R T A N T E Y O U R H U B A D D R E S S E S A B O U T T H I S G U I D E

I N T R O D U C T I O N

C R E A T I N G Y O U R N E T W O R K

A B O U T N E T W O R K M A N A G E M E N T

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LEDs and Ports 2-1 Before You Start 2-4 Posi t ion ing the Office Connect H ub 2-5 Using the Rubber Feet and Stacking Cl ips 2-6 Wall Mounting the Office Connect H ub 2-7 Connecting Workstations and Other Equipment to Your

Hub 2-7

Conne cti ng Office Connect H ubs Together 2-8

pot Checks 2-11

Introduction 1 How to Use This Guide 1 Conventions 2

Networking Terminology 1-2

3Com Network Management 3-1 Why Manage Your Hub? 3-2 Connecting to the Hub and Managing 3-3

Managing Through the Console Port 3-4 Managing Over the Network 3-6

Remote Management Service 3-7

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M A N A G I N G Y O U R H U B U S I N G Q U I C K C O N F I G M A N A G E R

A D D I T I O N A L M A N A G E M E N T U S I N G

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Setting Up a Resilient Link Pair 4-34 Using the Hub to Monitor Other Devices 4-37 Additional Management 4-39

Installing Quick Config Manager 4-1

Installation Requirements 4-1

Installation Procedure 4-2 Running Quick Config Manager 4-2 Configuring Multiple Hubs 4-3 Quick Config Manager Window Map 4-3 Accessing the Hub 4-6 Giving the Hub an IP Address 4-7 Resetting the Hub 4-11 Initializing the Hub 4-11 Viewing the Hub 4-12 Displaying Information About the Hub 4-13 Setting Up the Alert LED 4-15 Monitoring 4-18

Monitoring Activity and Errors Statistics 4-19

Frame Types Statistics 4-21

Network Traffic Statistics 4-22

Network Errors Statistics 4-23 Configuring a Port 4-25 Hub Security 4-28

Configuring Security at Port Level 4-29

Configuring Security at Hub Level 4-31 Resilience 4-33

VT100 User Interface 5-1

Screens 5-1 Screen Components 5-2 Special Keystrokes 5-3

Repeater, Unit and Port Screens 5-4

creen Map 5-4

Getting Started 5-6

Main Banner 5-6 Logo n 5 -7 Main Menu 5-9 Logo ff 5 -9

Auto Logout 5-9 Configuring and Viewing Setup Information 5-10 Setting Up Traps 5-12

nnecting a Modem to t he Console Port 5-13 Configuring Local Security 5-15 Configuring Users 5-17

Creating Users 5-17 Editing Users 5-18 Deleting Users 5-19

Polling a Remote Device 5-19

VT100

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P R O B L E M S O L V I N G

D I M E N S I O N S

T A N D A R D S A N D C A B L I N G

A N D

D D R E S S E S

T E C H N I C A L S U P P O R T

I N D E X L I M I T E D L I F E T I M E W A R R A N T Y

T A T E M E N T

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Viewing Internal Version Numbers 5-20 Downloading a Software Upgrade 5-21

Isolating a Problem 6-1 Problems When Using Your Hub 6-2 Problems When Using Quick Config Manager 6-3 Problems When Using VT100 6-3 Problems When Using an IP/IPX- ba sed Ma nagement

plication 6-4

, S

Dimensions and Operating Environment A-1 BABT Approval (for U.K. Users Only) A-1 Standards A-1 Cabling A-2

10BASE-T A-2 Console Port A-3

IP Addresses B-1

IPX A

Obtaining a Network Number B-2

How IP Addresses Work B-3 Assigning IP Addresses to a Small, Contained

Network B-5

IPX Addresses B-6

Online Technical Services C-1

World Wide Web Site C-1 3Com Bulletin Board Service C-1 3ComFacts Automated Fax Service C-2

3ComForum on CompuServe Online Service C-3 Support from Your Network Supplier C-4 Support from 3Com C-4 Returning Products for Repair C-6

EMC S

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Page 7

I M P O R T A N T

A F E T Y I N F O R M A T I O N

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WA RNI NG :

Warnings contain directions that you must follow for your personal safety. Follow all instructions carefully.

Please read carefully the following information before installing the OfficeConnect® hub:

■

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

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Only stack the OfficeConnect hub with other OfficeConnect units.

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Only use the power adapter that is supplied with the unit to ensure compliance with international safety standards.

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It is essential that the power outlet is located near the unit and is accessible. You can only remove power to the OfficeConnect hub by disconnecting the power adapter from the unit or from the socket outlet.

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This unit operates under SELV conditions (Safety Extra Low Voltage) according to IEC 950, the conditions of which are maintained only if the equipment to which it is connected is also operational under SELV.

■

There are no user-replaceable fuses or user-serviceable parts inside the hub. If you have a physical problem with the unit that cannot be solved with problem solving actions in this guide, contact your supplier.

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Disconnect the power adapter before moving the unit.

WARNING: Twisted Pair RJ45 ports.

These are shielded RJ45 data sockets. They cannot be used as telephone sockets. Only connect RJ45 data connectors to these sockets.

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I C H T I G E

I C H E R H E I T S H I N W E I S E

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ACHTUNG:

die Sie zur eigenen Sicherheit zu befolgen haben.

Lesen Sie bitte die folgenden Informationen sorgfältig durch, bevor Sie den Hub einbauen:

■

Auf besondere Vorsicht muß während des Ein- und Ausbaus des Hubs geachtet werden.

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Stapeln Sie den Hub nur mit anderen OfficeConnect Hubs zusammen.

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Verwenden Sie nur das mit dem Hub mitgelieferte Netzteil um die internationalen Sicherheitsstandards zu erfüllen.

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Die Netzsteckdose muß sich in unmittelbarer Nähe des Hubs befinden und frei zugänglich sein. Sie können den Hub nur spannungsfrei schalten, indem Sie das Steckernetzteil aus der Netzsteckdose ziehen oder die Verbindung zum Gerät unterbrechen.

Die Warnungen enthalten Anweisungen,

■

Dieser Hub arbeitet mit SELV-Spannung (Safety Extra Low Voltage, Sicherheitskleinspannung) gemäß IEC950. Diese Bedingungen werden nur eingehalten, wenn die Geräte mit denen der Hub verbunden ist ebenfalls mit SELV-Spannung arbeiten.

■

Es sind keine von dem Benutzer zu ersetzende oder zu wartende Teile in dem Gerät vorhanden. Wenn Sie ein Problem mit dem Hub haben, das nicht mittels der Fehleranalyse in dieser Anleitung behoben werden kann, setzen Sie sich mit Ihrem Lieferanten in Verbindung.

■

Bevor der Hub ausgebaut wird ist das Netzteil zu ziehen.

ACHTUNG: gedrehte paarfache RJ45 Anschlüsse.

Es sind abgeschirmte RJ45 Datenanschlußbuchsen. Sie dürfen nicht als Telefonanschluß verwendet werden. Verbinden Sie nur RJ45 Datenstecker mit diesen Anschlüssen.

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L’ I N F O R M A T I O N D E

É C U R I T É I M P O R T A N T E

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AVERTISSEMENT:

Les avertissements contiennent les 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.

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Seulement entasser le moyer avec les autres moyeux OfficeConnects.

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Seulement utiliser la pièce de raccordement d’alimentation qui est fournie avec le moyeu pour assurer la conformité avec les normes de sécurité internationales.

■

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.

■

Ce moyeu fonctionne sous les conditiones SELV (Sécurité du Voltage le plus Bas) d’après IEC950, les conditions desquelles sont maintenues seulement si le matériel à qui il est branché est aussi en exploitation sous SELV.

■

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 raccordement d’alimentation avant de remuer le moyeu.

AVERTISSEMENT: Les ports RJ45 de paire tordue.

Ceux-ci sont les socles de données RJ45 blindés. Ils ne peuvent pas être utilisés comme socles de téléphone. Seulement brancher les connecteurs de données RJ45 à ces socles.

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Y O U R

U B

D D R E S S E S

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Using Quick Config Manager, you can configure address information for your hub, which affects the way you can manage it. It is important that you note down this information as you may need to enter it when managing the hub again. Use this page to note down your settings.

If you initialize the hub, the address settings are retained to allow you to continue managing the hub. If you want to return the hub to its default address settings, you must enter them manually.

For information on configuring the hub’s address settings, see “Giving the Hub an IP Address” on page 4-7 .

Parameter Default

Device Name

Emergency Contact

Support Contract

IP Address 0.0.0.0

Subnet Mask

Serial Line IP Address

Subnet Mask

Router IP Address

Manager IP Address

3Com

0.0. 0.0

192.168.101.1

255.255.255.0

0.0.0.0

Your Setting

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A B O U T

H I S

U I D E

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Introduction

This guide describes how to set up and manage the OfficeConnect® Hub 8/TPM. The hub is ready for use in your network. It does not require management to get it working. Management simply allows you to perform additional network functions, for example monitoring your network and adding security.

This guide is written for users who are new to networking. If you are going to manage your network 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 these situations. If you are already familiar with network management, you may be able to skip some of the information in this guide and use the information given for reference purposes.

How to Use This Guide

This table shows where to find specific information:

If you are looking for information on:

The hub and networking terms

Creating your network

What you can do with management and the different ways you can manage your hub

Managing your hub using 3Com’s Transcend® Quick Configuration Manager

Additional management using VT100

Problem solving

Dimensions, standards and cabling

Network addressing (IP/IPX)

The OfficeConnect product range, obtaining technical support, and 3Com repair services

Turn to:

Chapter 1

Chapter 2

Chapter 3

Chapter 4

Chapter 5

Chapter 6

Appendix A

Appendix B

Appendix C

There is a Quick Reference Guide accompanying this guide. It contains some useful information from this guide which you may need to refer to regularly.

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The text conventions that are used in this guide are:

Conventions

The icon conventions that are used in this guide are:

Icon

Type

Information Note Information notes call attention to

Caution

Warning

Description

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.

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 that appear on your screen, for example:

Enter the IP add ress: This typeface

commands that you enter, for example:

191.0.0 .172

When specific keys are referred 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].

Italics

are used to denote

emphasis

is used to represent

to in the

new terms

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I N T R O D U C T I O N

3C om

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Welcome to the world of networking with 3Com ® .

In the modern business environment, communication and sharing information is crucial. Computer networks have proved to be one of the fastest modes of communication but until now only large businesses could afford the networking advantage. The Office Connect® p roduct range from

changed this, bringing networks to the small

office.

The Office Connect Hub 8/TP M is ideal for creating a small network. It is compact and attractively designed for desktop use, and is part of the Office Connect ra nge which neatly stack together with clips, providing a host of facilities, for example print sharing and a network fax. For information on these products, see “3Com provides easy access to technical support information through a variety of services. This appendix describes these services.” on page C-1 .

A single Office Connect hub allows you to create a small network with up to eight workstations, as shown in Figure 1-1 .

Figure 1-1 Small Network Featuring Office Connect H ub And

Optional Print Server

If you need to connect more workstations, simply connect and clip another Office Connect h ub to form

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N T R O D U C T I O N

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1-2

a stack (each hub is a single repeater) . The Office Connect Hub 8/TP M h as eight 10BASE-T ports and a ninth 10BASE-2 (Coax) port. This guide helps you get the most out of your hub .

1: I

Networking Terminology

Network

Local Area Network (LAN)

Ethernet

10BASE-T

10BASE-2

Network Loop

is a collection of workstations (for example, IBM-compatible personal computers) and other equipment (for example, printers), connected for the purpose of exchanging information. Networks vary in size, some are within a single room, others span continents.

is a network, usually in an

office, that spans no more than a single site.

is a type of LAN, referring to the technology used to

pass information around the network.

is the name given to the Ethernet protocol that runs over hub uses network.

is the name given to the Ethernet protocol that runs over

equipment are connected by more than one path. Your hub detects this and of its ports to break the loop.

Twisted Pair (TP) RJ45

type connectors for connecting your

Coaxial

occurs when two pieces of network

cable.

cable. The Office Connect

Partitions

(isolates) one

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Segment

is the length of Ethernet cable connected to a port, whether this cable is 10BASE-T, 10BASE-2 (Coax) , or other type. When you daisy-chain equipment together with 10BASE-2 (Coax) cable, of the cable forms a single segment.

Packets

are the units of information your workstations and

other equipment send to each other over the network. A

Frame

is the data part of a packet. It is

the information that is seen by the hub.

Collisions

are a p art of normal Ethernet operation and occur if two or more devices attempt to transmit at the same time. A sudden sustained increase in the number of collisions can indicate a problem with a device, particularly if it is not accompanied by a general increase in traffic. On coaxial segments an increase in collisions can also indicate faulty cabling.

Device

is a term that is usually used to refer to a piece of

network equipment. Every device has a unique address that is used to identify it on the network.

all

Networking Terminology

SNMP (Simple Network Management Protocol)

protocol that controls how a management station gains information from a device. SNMP provides:

■

A set of rules that defin e how a m anagement station can communicate with a device.

MIB (Management Information Base)

■

defines what information can be obtained from the device by the management station. Every SNMP-manageable device has a MIB, which is a list of information about it.

■

Unsolicited messages called

Traps

, which work differently to the usual request/reply management communication. You can configure a device so that it generates a trap if a certain condition occurs, for example a port partitioning. The trap is sent to the management station to inform it of the occurrence.

1-3

is a

that

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N T R O D U C T I O N

I P.

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1-4

IP (Internet Protocol)

used to connect computers and data equipment into computer networks. It is used on a large international network called the universities, government facilities, research institutions and private companies. Netware protocol that perfor ms a similar function to

SLIP (Serial Line Internet Protocol)

protocol over a serial line connection.

VT100

is a type of terminal which uses AS CII characters.

VT100 screens have a text-based appearance.

Tel ne t

is a network application which enables a workstation

to connect to a device as if it were a terminal, such as VT100. It is provided as part of IP and is commonly available with SNMP network management.

Modem

(Modulator-Demodulator) is a piece of equipment used for transmitting computer data over telephone lines.

1: I

is a data communication protocol

Internet

, which is composed of

IPX

allows you to run the IP

is a Novell

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O U R

E T W O R K

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All of the products in the Office Connect® r ange are designed for ease of use. This chapter describes how to use your Office Connect Hub 8/TP M to create your network, and has information on:

■

The hub’s LEDs and ports

■

What you need to create your network

■

Where to site the hub

■

Using the rubber feet and stacking clips

■

Wall mounting the hub

■

Connecting your workstations and other equipment to the hub

■

Connecting your hub to other Office Connect h ubs

LEDs and Ports

■

The hub features diagnostic LEDs and easy to use ports.

The LEDs are shown in Figure 2-1 , and are used for:

Showing you how the hub and its ports are operating

Showing you how much your network is being used

Alerting you to a potential problem with your network

The ports are shown in Figure 2-2 , and are used for:

Connecting workstations and other equipment to your hub

Connecting your hub to another Office Connect h ub

Connecting a management station to your hub

Figure 2-1 and Figure 2-2 also appear on the Quick Reference Guide.

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2-2

2: C

Figure 2-1 The LEDs And How To U se Them

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LEDs and Ports

2-3

Figure 2-2 The Ports And H ow To Use Them

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C H A P T E R

R E A T I N G Y O U R N E T W O R K

”

1 1

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2-4

2: C

Before You Start

Your OfficeConnect hub comes with:

■

One power adapter for use with the Office Connect hub

■

A Warranty Registration card for you to fill out and return

■

Four rubber feet

■

Four stacking clips

■

One 3.5 disk

■

A Quick Reference Guide

■

This guide

Transcend® Quick Configuration Manager

Workstation Connections

To connect workstations and other equipment to your hub, you need :

0BASE-T connections for all your equipment. 3Com produce a range of easy to install network adapters, which provide your workstations with 10BASE-T connections.

An operating system with network support configured, running on your workstations.

One ‘Straight-through’ 10BASE-T cable for every workstation or piece of equipment. A ‘Straight-through’ cable is one where the pins of one connector are connected to the same pins of the other connector. 10BASE-T cables can be shielded or unshielded. We recommend you use shielded. The maximum length you can use is 100 meters (328 feet).

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In order to comply with the 10BASE-T standard, ports designed for workstation connections have been marked with the graphical symbol ‘x’. This denotes a crossover in the port’s internal wiring, for example 1x, 2x, 3x...

Hub Connections

If you have additional hubs you want to connect using 10BASE-2 (Coax), you need:

■

One 10BASE-2 50 Ohm cable for each additional hub. The minimum cable length you can use is 0.5 meters (1.6 feet). The maximum segment length you can have is 185 meters (607 feet).

■

One 10BASE-2 ‘Y’ piece for each hub. You can use ‘ T’ pieces but ‘Y’ pieces provide adequate clearance of the other ports.

■

Two 10BASE-2 50 Ohm terminators ( end pieces ).

Posi t ion ing the Office Connect H ub

When installing your OfficeConnect hub, ensure:

■

It i s out of direct sunlight and away from sources of heat.

■

Cabling is away fro m power lines and fluorescent lighting fixtures, and so urces of electrical noise such as radios, transmitters and broadband ampli fiers.

■

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 you provide a minimum of 25.4 mm (1 in) clearance .

2-5

If you have additional hubs you want to connect using 10BASE-T, you need:

■

One ‘Straight-through’ 10BASE-T cable for each additional hub.

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2-6

2: C

Using the Rubber Feet and Stacking Cl ips

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.

To stack 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 Figure 2-3 (1).

Position a clip over one of these holes and push it in until it clicks into place, as shown in Figure 2-3 (2). Repeat this for the other clip position on the same side.

Keeping the front of the units aligned, rest the bottom of the existing u nit on the clips’ spikes, as shown in Figure 2-3 (3). Push the clips firmly into the existing u nit until they click into place.

Figure 2-3 Clipping Your Units Together

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.

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Wall Mounting the Office Connect H ub

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

When wall mounting your hub, ensure that it is within reach of the power outlet.

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 1 42 mm (5. 6 in) apart. Use the arrows at the top of the Quick Reference Guide to mark the position of the holes. Fix the screws into the wall, leaving their heads 3 mm (0.12 in) clear of the wall surface.

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

CAUTION:

mount stacked hubs.

Only wall mount single hubs, do not wall

Wall Mounting the Office Connect H ub

Connecting Workstations and Other Equipment to Your Hub

WARNING:

Safety Information section carefully before you start.

ACHTUNG:

Abschnitt mit den wichtigen Sicherheitshinweisen gelesen haben, bevor Sie das Gerät benutzen.

AVERTISSEMENT:

soigneusement la section de L’information de Sécurité Importante avant que vous commenciez.

CAUTION:

Wait about 5 seconds between power cycles.

Connecting workstations and other equipment to your hub is easy. Connect them using 10BASE-T cables to any of the hub’s eight 10BASE-T RJ45 ports.

10BASE-T cables are very easy to use. To connect a 10BASE-T cable, simply slot the connector into the relevant RJ45 port. When the connector is fully in, its latch locks it in place. To disconnect the cable, push the connector’s latch in a nd remove it.

Ensure you have read the Important

Versichern Sie sich, daß Sie den

Assurer que vous avez lu

Do not power the hub off and on quickly.

2-7

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2-8

The hub detects all port connections, so you can start using your network immediately. When you need more ports, simply add more Office Connect hub s.

If you are using port 8 to connect a workstation, ensure the MDI/MDIX switch is set to MDIX.

If you do not use the 10BASE-2 (Coax) port, you do not need to terminate it with a terminator (end piece) .

2: C

Conne cti ng Office Connect H ubs Together

You can increase the number of workstations that can connect to your network by adding more OfficeConnect hubs. You can use either 10BASE-T or 10BASE-2 (Coax) to do this:

■

With 10BASE-2 (Coax) you can connect up to 30 hubs on a single segment, leaving all of the RJ45 ports free.

■

With 10BASE-T you can connect up to four hubs in series.

CAUTION:

together using both 10BASE-T and 10BASE-2 (Coax). This causes a network loop.

Do not connect the same two hubs

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Connecting Hubs Using 10BASE-2 (Coax)

When using 10BASE-2 (Coax) cable, it is important that both ends of the segment are properly terminated with 50 Ohm terminators ( end pieces ) .

Only use 50 Ohm 10BASE-2 (Coax) cables and use a ‘Y’ piece for each hub. You can use ‘T’ pieces but ‘Y’ pieces provide adequate clearance of the other ports.

Connect a 10BASE-2 ‘Y’ piece to each of your hubs. Daisy-chain each ‘Y’ piece with 10BASE-2 (Coax) cable to form a single segment, as shown in Figure 2-4 . Remember to terminate the two free ends of the segment by fit ting t erminators (end pieces).

To disconnect a 10BASE-2 (Coax) cable, twist each connector counter-clockwise to unlock it, and remove it.

Conne cti ng Office Connect H ubs Together

2-9

Figure 2-4 Correct Hub Connections Using 10BASE-2 (Coax)

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Connecting Hubs Using 10BASE-T

You can connect hubs together with 10BASE-T in a number of ways, but for simplicity we recommend the following method:

Starting from the bottom, connect port 8 of the lower hub to port 7 of the hub immediately above. Repeat for each hub, as shown in Figure 2-5 .

Set all MDI/MDIX switches to MDI (in) except for the top hub (the one with port 8 not connected to another hub). This unused port can be connected to a workstation provided that the MDI/MDIX switch is set to MDIX (out).

Figure 2-5 Correct Hub Connections Using 10BASE-T

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pot Checks 2-11

Checking Hub Connections

When you have connected your hubs, power them on. The Port Status LEDs for the ports you have used should be green for 10BASE-T, or off for 10BASE-2 (Coax). If they are not, check your connections .

If the 10BASE-2 (Coax) port is not used and is not terminated, the LED should be yellow showing that it has partitioned. This is correct operation.

pot Checks

At frequent intervals, visually check that:

■

The Alert LED is not lit — this is the best way to find out if there are problems with your network

■

Case vents are not obstructed

■

Cabling is secure and not pulled taut

If you suspect there is a problem, refer to Chapter 6 .

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A B O U T

E T W O R K

A N A G E M E N T

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Network management is not required to get your hub working, it simply allows you to change the way it works and to monitor what is happening to your network. Each OfficeConnect® Hub 8/TPM is a separate manageable entity, that means you manage each OfficeConnect Hub 8/TPM individually. This chapter lists the management tasks you can perform, and describes the ways you can connect your management station to your hub. This guide uses refer to the piece of equipment you are using to manage the hub.

Transcend Quick Configuration Manager, referred to as

‘Quick Config Manager’

your hub and provides an easy-to-use graphical management system, through the hub’s console port. Quick Config Manager uses a familiar Windows interface with point and click operation. To use it effectively, you need to be familiar with Microsoft Windows. For information on Microsoft Windows, refer to the Microsoft Windows User’s Guide.

You can also manage your hub using a VT100 terminal or any Telnet facility that emulates a VT100 terminal. VT100 uses a text-based user interface.

‘Management Station’

in this guide, is supplied with

3Com Network Management

Quick Config Manager provides a subset of the functionality that is present in other 3Com management applications, for example the IP/IPX-based Transcend® Enterprise Manager for Windows (version 4.x and above).

Whether your network is large or small, its ongoing performance, growth and security are only as good as its management system.

Using intelligent 3Com software distributed throughout the network, 3Com’s Transcend management applications support all of today’s platforms and manage a wide variety of 3Com products. This gives you total control over your entire 3Com network from a single management station.

For further information about which Transcend management application can benefit your growing network, call your local sales office, see “3Com provides easy access to technical support

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information through a variety of services. This appendix describes these services.” on page C-1 .

Why Manage Your Hub?

With management, you can change and view the way your hub and network operates:

■

Configure IP information for the hub so that an

based network management station can

communicate with it.

■

Restart the hub to refresh its statistics and use any new configurations.

■

Initialize the hub to return it to its factory settings (IP and console port i nformation is re t ained ).

■

Display a graphical representation of the hub to quickly view the status of each port.

■

Display general hub information.

■

Configure the Alert LED to light for a number of conditions, and show what conditions have triggered the Alert LED to come on.

■

Graphically display network information for each port and the hub.

■

Enable and disable ports.

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■

Configure security for the hub, including setting up new users and specifying what equipment is allowed to communicate through the hub.

■

Set up resilience; specify a backup connection that takes over should a main connection fail.

■

Configure the hub to send messages over the network or a modem link, to an IP/IPX-based management application ( for example, Transcend Enterprise Manager) , reporting the state of the hub and the network.

■

Use the hub to monitor other devices on your network and report any deviation from their normal operation t o an IP/IPX-based management application.

■

Poll a remote device to see if it is operational.

■

View any faults that have occurred with the hub.

■

Download any future software upgrades to the hub.

Connecting to the Hub and Managing

Managing your hub is easy. There are many ways you can connect your management station to your hub, as shown in Figure 3-1 .

You can manage the hub:

■

Through the console port

Using Quick Config Manager

■

Using a VT100 Terminal Emulator

■

Using a VT100 Terminal

■

Over the network

Using an IP/IPX-based N etwork M anager

■

Using a VT100 Terminal Emulator through Telnet

■

For information on using modems as part of your management connection, see “Remote Management Service” on page 3-7 .

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Managing Through the Console Port

This section describes how to connect and set up equipment to communicate with the hub through the console port (called

By default, the hub automatically configures its baud rate. T he maximum rate the autoconfiguration function detects is 1 9 2 00 baud.

You need to use a null modem cable for connection to the hub’s console port. This is available from your supplier. The null modem cable must:

■

Have a 9 pin female ‘D’ connector for connection to your hub, and the appropriate connector for connection to your management station.

■

Not exceed 15 meters (50 feet).

There are a variety of null modem cables that you can use. For an example of one of these, s ee “Cabling” on page A-2 .

out-of-band

management).

Figure 3-1 Different Management C on nections To The Hub

nnection to the console port may be direct or

ough modems, giving the option of local or

ote management. For information on managing

ough modems, se e “Remote Management

Service” on page 3-7 .

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Using Quick Config Manager

onnect one end of the null modem cable to the console port on the hub, and the other to the serial (RS232) port on your management station.

Quick Config Manager uses SLIP to manage your hub. When you have made your connection and installed Quick Config Manager, you are ready to manage your hub.

Refer to Chapter 4 for information on installing and using Quick Config Manager.

Using a VT100 Terminal Emulator

onnect one end of the null modem cable to the console port on the hub, and the other to the serial (RS232) port on your management station. You need to set the character size (8), stop bit (1) and parity (none) settings of your management station to work with the hub.

Press [Return][Return] to start the communication.

The management station you are using needs to run suitable terminal emulation software. Many VT100 terminal emulation packages are available.

Connecting to the Hub and Managing

Microsoft Windows has a terminal emulation program called ‘HyperTerminal’ (for Windows 95) or ‘Terminal’ (for other Windows versions).

Refer to the documentation that accompanies your particular terminal emulation package for details, or consult your supplier if you need further advice.

Refer to Chapter 5 for information on performing additional management using the VT100 management interface.

3-5

Using a VT100 Terminal

onnect one end of the null modem cable to the console port on the hub, and the other to the serial (RS232) port on your VT100 terminal. You need to set the character size (8), stop bit (1) and parity (none) settings of your VT100 terminal to work with the hub.

Press [Return][Return] to start the communication.

Refer to Chapter 5 for information on performing additional management using the VT100 management interface.

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Managing Over the Network

This section describes how to set up equipment to allow you to communicate with the hub over the network (called

Before you can manage your hub over the network

sing IP , you must connect to its console port locally and use Quick Config Manager to enter IP information for the hub:

Connect one end of a null modem cable to the console port on the hub, and the other to the serial (RS232) port on your management station.

Install Quick Config Manager and use it to configure the necessary IP information for the hub.

Refer to Chapter 4 for information on installing and using Quick Config Manager.

If using IPX, you do not need to enter IPX information for the hub.

in-band

management).

Using an IP/IPX-based Network Management Application

3Com’s Transcend network management applications enable you to get the best out of your hub. Any IP/IPX-based network management application can manage the hub.

The use of IP/IPX-based network management applications is not described in this manual. Refer to the user documentation that accompanies your application, for more information.

Using a VT100 Terminal Emulator (over Telnet)

Any VT100 terminal emulator that uses Telnet should be able to communicate with the hub over the network. Up to three active management sessions can access the hub concurrently. If a connection to a session is not closed, but is lost inadvertently, the connection is closed by the hub after between 2 and 3 minutes of inactivity.

Refer to the documentation that accompanies your particular terminal emulation package for details, or consult your supplier if you need further advice.

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Refer to Chapter 5 for information on performing additional management using the VT100 management interface.

Remote Management Service

e OfficeConnect hub has a special modem dial-out feature which can be set up by your supplier to inform them when your hub or network is operating incorrectly. This allows your supplier to know immediately when certain problems occur, so they can act on it, leaving you to carry on with your work.

Contact your supplier to find out if they are offering a support service based on this feature.

Remote Management Service

3-7

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O N F I G

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This chapter describes how to install and use Quick Config Manager. For an overview of what you can do when managing the hub, see Chapter 3 .

The sections in this chapter are in the order you would normally p erform them when managing the hub for the first time. If you are new to network management, read through this chapter to learn about the different management you can perform.

Quick Config Manager has a comprehensive help system that has the same useful information as this chapter.

Before you can manage with Quick Config Manager, you must make a connection to the hub’s console port, see Chapter 3 .

In the descriptions of the options given in this chapter, the default values are underlined.

Installing Quick Config Manager

Installation Requirements

Quick Config Manager requires an IBM compatible PC with at least a 486/33 processor. Your system must also include:

■

Microsoft Windows ® 3.1 or Windows for Workgroups 3.11 or Windows 95.

■

MS-DOS 5.0 or later (not needed for Windows ‘95) .

■

Minimum of 4MB available hard disk space.

■

Minimum of 8MB RAM. All RAM above the first megabyte must be configured as extended memory.

■

3.5

disk drive.

■

VGA or SVGA color monitor.

■

Mouse.

■

Serial port capable of 9600 baud, no Parity, 8bit Data, 1 StopBit.

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Installation Procedure

Quick Config Manager can be installed on its own or on to a workstation that already has other Transcend® management applications installed on it.

CAUTION:

the same directory as any other Transcend management applications. The default directory into which Quick Config Manager is installed is C:\QUICKMGR. This can be changed during the installation if required.

The installation program is a standard Windows based installation. To install Quick Config Manager:

Start Windows.

f you already have an existing Transcend management application running, ensure that it is closed down.

Insert the Quick Config Manager disk into your disk drive.

In the Program Manager window, select the command from the

Do not install Quick Config Manager in

File

menu.

Run

Command Line

In the

drive

(where and click on OK.

The installation program starts and checks your system configuration; enter any information that’s requested. The installation program reports when it has completed the installation.

When the Quick Config Manager installation is complete, it has its own program group called Transcend. If other Transcend management applications are present, the existing Transcend program group now includes Quick Config Manager.

box, type

is the letter of your 3.5

drive

Running Quick Config Manager

Whenever you want to start the Quick Config Manager application, double-click on the Quick Configuration Manager icon.

CAUTION:

parallel with any other Transcend management application.

Before you can manage your hub, you must make a connection to the hub, see Chapter 3 .

Do not run Quick Config Manager in

:\SETUP

disk drive)

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Configuring Multiple Hubs 4-3

If you are going to manage over a serial link from your management station, Quick Config Manager uses COM1 as the default serial port. You can change this by editing the following line under the [slip] subsection of the QUICKMGR.INI file:

Serial Attri b=CO M1:9 60 0,n, 8,1

Editing it to changes the default serial port to COM2.

Seria lAtt rib= COM2: 96 00,n ,8,1

Configuring Multiple Hubs

There is a special feature which allows you to connect your management station to a new OfficeConnect® Hub 8/TP M without needing to close and reopen Quick Config Manager. This is particularly useful if you have many OfficeConnect hubs that need configuring or monitoring.

This feature only works if all the hubs you are going to connect to have the same baud rate (or are set to Auto Config) as the management station.

To d o this:

Make your serial connection to the new hub.

From the

Quick Config Manager closes any windows that are open in preparation for the new management session.

File

menu, select

Reset View

Quick Config Manager Window Map

Figure 4-1 (over the page) shows how all of the Quick Config Manager windows are accessed. This diagram also appears on the Quick Reference Guide. The number at the top right-hand side of each window refers to the page that describes the window.

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Figure 4-1 Quick Config Manager Window Map

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Quick Config Manager Window Map

4-5

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Accessing the Hub

The OfficeConnect Hub 8/TP M uses

strings

as a security measure, to check management access to the hub. T he community string you use must match one of the community strings configured for the hub. Quick Config Manager remembers the last community string used.

efault community strings are:

security

■

— allows you to view and configure the

hub’s information

public

— allows you to view the hub’s information

To enter the community string:

Double-click on the Quick Config Manager icon to start the application.

From the

Quick Config Manager displays the Community/Polling dialog box, as shown in Figure 4-2 .

Enter the community string in the box.

Configure

menu, select

community

Figure 4-2 Community/Polling Dialog Box

Community/Polling

hanges made to this dialog box will only take effect for new windows. An y graphs or zoom view windows that are already open wi ll continue to use the old values. Close these windows and reopen them to use the new values.

Click on

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You can also use the Community/Polling screen to:

■

Automatically di splay a graphical representation of the hub every time you start Q uick Config Manager.

■

Define how regularly the graphical representation of the hub is updated.

■

Define how regularly any displayed graphs are updated.

Bitmap

The time in minutes between consecutive updates of the graphical representation of the hub. If Off is selected, the bitmap is not updated at all (you can select any new states).

Graph(s)

The time in seconds between consecutive updates of any graphs that are displayed.

Invoke zoom view on start-up

want the graphical representation of the hub to be

Through VT100 management you can configure new users for the hub (with different community strings) , see “Configuring Users” on page 5-17 .

Off / 15 / 30 / 45 / 60

Update Zoom

isplayed every time you start Q uick Config Manager.

from the

/ 30 / 4 5 / 60

File

menu to display

Check this box if you

Giving the Hub an IP Address

You can configure the hub with an IP address and other useful information, e nabl ing i t to

mmunicate over (become part of) an IP network .

The hub does not need an IP address to make your Quick Config Manager work with it.

You need to give your hub an IP address if you want to use an IP-based network manager, for example Transcend Enterprise Manager, to manage it over the network.

CAUTION:

see “IP Addresses” on page B-1 .

he IP Setup d ialog box is used to set up IP

information and change the SLIP address for the hub.

The IP Setup dialog box has a useful Easy Setup option which takes you through the IP configuration process. The information that you enter during the Easy Setup process is the same as, and is entered into, the IP Setup dialog box.

If you have no previous knowledge of IP,

4-7

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To display the IP Setup dialog box and view or configure the hub’s address settings:

From the

Configure

menu, select

IP Setup

Quick Config Manager d isplays either the IP Setup

ialog box or the Easy Setup Option, as shown in Figure 4-3 , depending on what IP information is currently configured for the hub:

■

If an IP address has been configured for the hub, and it is not 0.0.0.0, the IP Setup dialog box is displayed. If you have previously configured address information for the hub but want to go through the Easy Set-Up option again, you can start it by clicking on the

■

If no previous IP information has been

Easy Set-Up

configured for the hub or the IP address is configured as 0.0.0.0, and the Enable IP box is checked, the Easy Setup option is started. If you want to enter information directly into the IP Setup screen or abort the Easy Setup process,

Abort

select The Easy Setup option asks you if you want to manually configure the hub for IP. If you have a BOOTP server (that automatically allocates IP addresses) select

, otherwise select

...

button.

Ye s

Figure 4-3 IP Setup D ialog Box And Easy Setup Option

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Enter the relevant information into the IP Setup diolog box or Easy Setup screens and click on exit the screens.

Reset the hub for any changes to take effect, see “Resetting the Hub” on page 4-11 .

After resetting the hub, you may need to select

Reset View

from the

File

menu to restart

communication using the new information.

CAUTION:

Always make a note of any changes you make to the settings on this screen. There is an area at the front of this User Guide for doing this, called “Your Hub Addresses” .

Device Configuration

Device Name

■

Show s the following:

Provides a box for you to type a name for the hub. Use a descriptive name, for example ‘ Finance’ .

Emergency Contact

■

Provides a box for you to type the name and/or telephone number of your network administrator (possibly yourself) who should be contacted in an emergency.

Giving the Hub an IP Address

Support Contract

■

— Provides a box for you to type the ID number of any technical support contract you may have.

The default entries for these three fields is ‘3Com’. These defaults are just place holders and should be changed for your information as soon as possible.

These three fields u se the same information as

ysContact and sysName i n the MIB II panel , so if you change them, the fields in the MIB II panel change as well. For information on the MIB II panel, see “Displaying Information About the Hub” on page 4-13 .

Network Configuration

IP Address

■

Provides a box for you to type the IP

Show s the following:

address of the hub .

CAUTION:

To ensure that Quick Config Manager can

always communicate with the hub, the IP subnet

192.168.101.x is permanently assigned to the SLIP port in addition to the user configurable SLIP address. Do not use this subnet for your Ethernet (network).

4-9

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Subnet Mask

■

4: M

Provides a box for you to type the

subnet mask for the I P address.

Enable IP

■

— If disabled, the IP fields for this dialog box are blanked and grayed-out. If enabled, the IP fields are enabled, allowing you to enter your IP information. If you are not going to manage the hub over the network, disable IP.

Out of Band Configuration

Serial Line IP Address

■

Show s the following:

SLIP a llows IP to run over the console port instead of the network. SLIP allows you to use out-of-band management, either locally or remotely through a modem. SLIP operates with any valid IP address. The default is 192.168.101.1 which is the address Quick Config Manager uses.

SubNet Mask

■

Enter the SLIP s ubnet mask. For a

class C address, 255.255.255.0 (the default ) is suitab le.

If you are using SLIP and have c hang ed any of the console port settings using VT100, ensure that Flow Control is not set to XON/XOFF, see “Connecting a Modem to the Console Port” on page 5-13 .

Router IP Address

Enter the IP address of the router (if you have one) which is used by the hub to communicate with other networks.

Manager IP Address

Enter the IP address of a management station that has an IP-based network management application running on it. You can configure the hub to send messages, called this management station .

Quick Config Manager does not have a facility to receive traps because it is a configuration tool, not a management tool.

traps

, to

If you require more information about SLIP, read the Internet Activities Board document RFC 155.

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Resetting the Hub 4-11

Resetting the Hub

Resetting the hub simulates switching the hub off and on. You may want to reset the hub if you want to:

■

Apply any changes made to the hub’s IP configuration.

■

sets the hub’s statistics counters.

CAUTION:

the data being transmitted over the network to be lost.

To r e s e t the hub:

From the

uick Config Manager asks you to confirm the reset .

In the confirmation dialog box, click on

The hub takes about 20 seconds to reset itself. Yo u may need to select re-establish communication with the hub.

Performing a reset may cause some of

Configure

menu, select

Reset View

from the

Reset

File

menu to

Initializing the Hub

Initializing the hub causes it to return to its factory default settings. You may want to do this if the hub has been previously used in a different part of your network, and its settings are incorrect for its new environment.

CAUTION:

configuration information such as security, resilient links and passwords. However, the IP address, subnet mask, default router, SLIP and console port information is r etained to ensure you can continue management communication with the hub over the network.

To initialize the hub:

From the

Quick Config Manager asks you to confirm the initialization .

In the confirmation dialog box, click on

The hub takes about 20 seconds to initialize itself. You m ay need to select to re-establish communication with the hub.

Initializing the hub removes all

Configure

menu, select

Reset View

Initialize

from the

File

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Viewing the Hub

Quick Config Manager can display a graphical representation of the hub you are managing, with:

■

The ports color coded to show their condition

■

The Alert LED reflecting its physical state

To display the hub:

■

From the

Quick Config Manager displays a zoom view of the

ub, as shown in Figure 4-4 . If the zoom view is

already open, it is selected.

Figure 4-4 Zoom View Of The Hub

View

menu, select

Zoom In

he port color coding shows th ese c onditions:

Green

■

— Port enabled and capable of receiving and

transmitting traffic

Red

■

— Port enabled and partitioned, or port

enabled but the connection is los t

Blue

■

— Port disabled by management

In the Community/Polling dialog box, you can specify whether the zoom view is invoked on starting Quick Config Manager, and how often the zoom view is polled (updated). If you want to update the zoom view immediately, without waiting for a poll, select Update Zoom from the File menu.

Double-clicking on the Zoom View

ou can configure i nformation for t he h ub by

double-clicking on the zoom view:

■

If you double-click on a port, the Port dialog box is displayed. This is used to c onfigure information for a port, see “Configuring a Port” on page 4-25 .

■

If you double-click on anything other than a port, the General Info dialog box is displayed. This is used to

onfigure information for the h ub, see “Displaying

Information About the Hub” on page 4-13 .

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Displaying Information About the Hub 4-13

Displaying Information About the Hub

Quick Config Manager enables you to display detailed information about the hub. This information is stored within the hub in a list, called a (Management Information Base). The MIB defines what information can be obtained from the hub by an SNMP network management station.

To display this information:

Do one of the following:

■

Double-click on the graphical representation of the hub (but not on a port).

■

From the

Configure

menu, select

MIB

General Info

...

In the General Info dialog box, select the

MIB II

category.

Quick Config Manager displays the MIB II panel , as shown in Figure 4-5 .

Figure 4-5 MIB II Panel

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sysDescr

the hub’s Management Agent software.

sysObjectId

the hub’s Management Agent software.

sysUpTime

the last reset.

sysContact

of the person who can be contacted in the event of a problem with the hub.

sysName

of the hub.

ysContact and s ysName u se the same information

as the Device C on figuration fields in the IP Setup

ialog box , so if you change them, the fields in the IP Setup dialog box change as well. For information on the IP Setup d ialog box, see “Giving the Hub an IP Address” on page 4-7 .

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Shows the system description supplied by

Shows the SNMP object identifier for

Shows the time that has elapsed since

Provides a box for you to type the name

sysLocation

location of the hub.

sysServices

supports.

Refresh

Provides a box for you to type the

Shows the services that the hub

Refreshes the information in the panel .

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Setting Up the Alert LED 4-15

Poll Failures

Setting Up the Alert LED

The Alert LED can warn you of potential problems with your network. Quick Config Manager allows you to:

■

Test the Alert LED.

■

Configure the conditions that cause the Alert LED to light.

■

View what conditions have caused the Alert LED to light.

■

monitor a device, it periodically polls it for information. If the device fails to respond, the failure is seen by the hub.

Network Errors

■

communication, or there is a high amount of errors with the communication, it could be due to too many devices on your network or an incorrectly configure device.

By default, the Alert LED is configured to light if a 10BASE-T port is partitioned or if there is high network utilization (over 80%).

— If your hub has been configured to

— If the network has high volumes of

You can configure the Alert LED to light for:

Incorrect configurations

■

— If there is a network loop due to an incorrect configuration in your network, a port partitions. The coaxial port automatically partitions if it is not used.

Security Violations

■

— If an unsuccessful login attempt occurs, or a device that is not known to your hub tries to communicate with it, a violation occurs. This may be due to someone trying to gain unauthorized access to your network.

To configure the Alert LED:

Do one of the following:

Double-click on the graphical representation of

■

the hub (but not on a port).

■

From the

Configure

menu, select

In the General Info dialog box, choose the

General Info

Alerts

...

category.

Quick Config Manager displays the Alerts panel , as shown in Figure 4-6 .

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Figure 4-6 Alerts Panel

Configure the conditions for the Alert LED.

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If any Alert conditions are active, the conditions are displayed in red. The other conditions are displayed in green. If the active conditions are enabled, the Alert LED will be lit.

In the Alerts panel :

Alert LED Test

Allows you to test the Alert LED. If you select Enable and click on true alert condition of the hub.

When you have finished your test, remember to disable to Alert LED Test. To do this, select Disable and click on OK. The Alert LED now reflects the current Alert condition of the hub.

UTP Port Partition

Allows you to specify whether the Alert LED lights if a UTP port becomes partitioned, which happens if a network loop occurs.

Enabled / Disabled

, the Alert LED lights regardless of the

Enabled / Disabled

Click on

when the Aler t LED setup is complete.

If this condition is resolved after causing the Alert LED to light, the LED goes off (it stays lit if other conditions also caused it to light).

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Setting Up the Alert LED 4-17

Coax Port Partition

Allows you to specify whether the Alert LED lights if the coaxial port becomes partitioned.

If this condition is resolved after causing the Alert LED to light, the LED goes off (it stays lit if other conditions also caused it to light).

Allows you to specify whether the Alert LED lights if a login violation occurs, which happens if a user attempts to log on to your hub using the VT100 screens with an invalid username/password combination three consecutive times.

If this condition caused the Alert LED to light, the LED goes off after you have acknowledged the alert by pressing the associated lit if other conditions also caused it to light).

Port Security Violation

Allows you to specify whether the Alert LED lights if a port security violation occurs, which happens if an unauthorized device attempts to communicate through your hub.

Enabled / Disabled

Ack

button (the LED stays

Enabled / Disabled

If this condition caused the Alert LED to light, the LED goes off after you have acknowledged the alert by pressing the associated lit if other conditions also caused it to light).

Authentication Failure

Allows you to specify whether the Alert LED lights if an authentication failure occurs, which happens if a user attempts to access information on your hub using an invalid community string.

If this condition caused the Alert LED to light, the LED goes off after you have acknowledged the alert by pressing the associated lit if other conditions also caused it to light).

WorkGroup Monitor Failure

Allows you to specify whether the Alert LED lights if

workgroup monitor f ailure occurs, which happens if a remote device fails to respond to a workgroup monitor p oll from your hub.

If this condition caused the Alert LED to light, the LED goes off after you have acknowledged the alert by pressing the associated lit if other conditions also caused it to light).

Ack

button (the LED stays

Enabled / Disabled

Ack

button (the LED stays

Enabled / Disabled

Ack

button (the LED stays

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Network Utilization

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High / Med / Low / Disabled Allows you to specify whether the Alert LED lights if a certain level of network utilization is exceeded for five seconds. The levels are:

High

■

— 80% network utilization

Med

— 50% network utilization

Low

— 12% network utilization

If this condition is resolved after causing the Alert LED to light, the LED goes off (it stays lit if other conditions also caused it to light).

Following a period of excessive network activity, the Alert LED stays lit for a short period of time.

Network Error Rate

High / Med / Low / Disabled Allows you to specify whether the Alert LED lights if a certain level of network errors is exceeded for approximately one minute. The levels are:

High

■

— 100 errors per 10000 frames

Med

— 10 errors per 10000 frames

Low

— 1 error per 10000 frame s

Monitoring

You can quickly and easily monitor your network by viewing various types of network information:

■

Activity and errors

■

Frame types

■

Network traffic

■

Network errors

The information is displayed as a graph or pie chart, and can be helpful for spotting and isolating any potential network problems you may have.

To view general information for the hub, see “Displaying Information About the Hub” on page 4-13 .

If this condition is resolved after causing the Alert LED to light, the LED goes off (it stays lit if other conditions also caused it to light).

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Monitoring 4-19

Monitoring Activity and Errors Statistics

Quick Config Manager allows you to display the total network activity and errors seen by a port or the hub (all ports) in any one time period.

To display the Activity/Errors graph for a port:

Double-click on the port for which you want to display the Activity/Errors graph.

In the Port dialog box, choose the

In the Repeater Port Info panel, select the check box.

Click on

To display the Activity/Errors graph for the hub:

■

From the

Quick Config Manager displays the Activity/Errors graph, as shown in Figure 4-7 .

View

menu, select

Info

category.

Activity/Errors

Activity

Figure 4-7 Activity/Errors Graph

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Total Errors

have occurred per poll, it should be a small percentage of the readable frames figure.

Runts

octet counts less than the minimum legal size (512 b its), which were not involved in a collision on the segment being monitored . Runt frames are the result of collisions on other segments and are propagated around the network; this is a normal part of Ethernet operation. An excessive number of runts or collisions is an indication of congestion. You may need to consider segmenting your network (separating the busiest parts).

Readable

are of valid length and have not suffered a collision or FCS error. Look for unusual increases in traffic rate; this can indicate a potential problem.

Broadcast

which are addressed to all devices. The number of broadcast frames is normally a small percentage of the value seen for unicast (single address) frames.

network performance.

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Shows the total number of errors that

Shows the number of frames received with

Shows the number of frames received that

Shows the number of frames received

igh level of broadcast frames can adversely affect

Collisions

transmission collision was detected. Collisions are a normal part of Ethernet operation and occur if two or more devices attempt to transmit at the same time. A sudden sustained increase in the number of collisions can indicate a problem with a device, particularly if it is not accompanied by a general increase in traffic. On coaxial segments an increase in collisions can also indicate faulty cabling.

The values shown in the Activity/Errors graph are per poll period, not per second. To change the poll period, see “Accessing the Hub” on page 4-6 .

Shows the number of frames for which a

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Monitoring 4-21

Frame Types Statistics

Quick Config Manager allows you to display the total network frame types seen by a port or the hub (all ports) in any one time period. Any frames producing errors are not included, these are shown in the Activity/Errors graph, see “Monitoring Activity and Errors Statistics” on page 4-19 .

To display the Frame Types pie chart for a port:

Double-click on the port for which you want to display the Frame Types pie chart.

In the Port dialog box, choose the

In the Repeater Port Info panel, select the check box.

Click on

To display the Frame Types pie chart for the hub:

■

From the

Quick Config Manager displays the Frame Types pie chart, as shown in Figure 4-8 .

View

menu, select

Info

Frame Types

category.

Frames

Figure 4-8 Frame Types Pie Chart

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Unicast

received that are addressed to single devices.

Multicast

received that are addressed to multiple devices. The total number of multicast frames is normally a small percentage of the value seen for unicast (single address) frames. A high level of multicast frames can adversely affect network performance.

Broadcast

which are addressed to all devices. The total number of broadcast frames is normally a small percentage of the value seen for unicast (single address) frames. A high level of broadcast frames can adversely affect network performance.

The values shown in the Frame Types pie chart are per poll period, not per second. To change the poll period, see “Accessing the Hub” on page 4-6 .

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Shows the percentage of readable frames

Shows the percentage of frames received

Network Traffic Statistics

Quick Config Manager allows you to display the network traffic as a percentage of the total possible traffic for a port or the hub (all ports) in any one time period.

To display the Network Traffic graph for a port:

Double-click on the port for which you want to display the Network Traffic graph.

In the Port dialog box, choose the

In the Repeater Port Info panel, select the check box.

Click on

To display the Network Traffic graph for the hub:

■

From the

View

menu, select

Traffic

Info

category.

Traffi c

Quick Config Manager displays the Network Traffic graph, as shown in Figure 4-9 . The values shown in the Network Traffic graph are the average per poll period. To change the poll period, see “Accessing the Hub” on page 4-6 .

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Monitoring 4-23

Network Errors Statistics

Quick Config Manager allows you to display the numbers of frames with errors seen by a port or the hub (all ports) in any one time period.

To display the Network Errors graph for a port:

Double-click on the port for which you want to display the Network Errors graph.

Figure 4-9 Network Traffic Graph

Errors

Info

category.

In the Port dialog box, choose the

In the Repeater Port Info panel, select the check box.

Click on

To display the Network Errors graph for the hub:

■

From the

Quick Config Manager displays the Network Errors graph, as shown in Figure 4-10 .

View

menu, select

Errors

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Figure 4-10 Network Errors Graph

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FCS Errors

with checksum errors that do not have alignment errors. FCS errors are most likely caused by noise on the cable and should be a very small percentage of the total traffic. If it is not, change the transceivers or network adapters of devices connected to the hub to see if this eliminates the problem. FCS errors can also be caused by electrical interference from other cables or machinery.

Alignment

with alignment errors (also known as framing errors). Alignment errors should be a very small percentage of the total traffic. They are likely to be caused by a fault at the transmitting device. Locate the segment and if there is only one transmitting device (for example, fiber or 10BASE-T) change the transceiver or adapter to see if this eliminates the problem.

Too Longs

that are greater than the maximum size permitted on Ethernet (1518 octets).

Short Events

received. A short event is a transmission of less than the minimum size permitted on Ethernet (64 octets). Short events can indicate externally generated noise causing problems on the network.

Shows the number of frames received

Shows the number of short events

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Configuring a Port 4-25

Check the cable routing and reroute any cabling which may be affected by other noise sources.

Late Events

a collision was detected after the valid packet minimum time. A late event can occur if you have a Local Area Network that is longer than Ethernet standards allow (for example, more than four repeaters in series or excessively long segments).

Very Long Events

caused Jabber Lock Up protection to operate. Jabber Lock Up is when a transceiver turns itself off, if it starts uncontrollably transmitting. Isolate the source and change the transceiver or network adapter in the device to see if this eliminates the problem.

Rate Mismatch

timing was outside the permitted range. This may indicate a non-compliant device on your network. Isolate the source and change the transceiver or network adapter in the device to see if this eliminates the problem.

The values shown in the Network Errors graph are per poll period, not per second. To change the poll period, see “Accessing the Hub” on page 4-6 .

Shows the number of frames for which

Shows the number of frames that

Shows the number of frames whose

Configuring a Port

Quick Config Manager allows you to configure how individual ports operate, enabling you to introduce some simple security to your network. The hub provides more complete security which you can configure for the ports, see “Hub Security” on page 4-28 .

For each port you can configure it:

■

To be enabled or disabled.

■

To send traps (messages) to an IP/IPX-based network management application if the port change s s tate,

or example, the port partitions or its connection is

lost.

■

To learn the MAC address (hardware address) of the device connected to it.

Enabling a port allows it to repeat information to and from the network. Disabling a port prevents it from repeating information onto the network. We recommend that you disable any unused ports to prevent unauthorized use.

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You can configure a port so that it sends a trap to a network management application when the status of the link changes (for example, if a device is connected to or disconnected from the port), or when the port partitions. You can also configure a port to store the source address of frames received by the port, this enables you to detect which devices are attached to each port of the hub.

To configure a port:

From the representation of the hub.

Double-click on the port you want to configure.

In the Port Configuration dialog box, choose the category.

Quick Config Manager displays the Repeater Port Info panel, as shown in Figure 4-11 .

In the Repeater Port Info panel, select either Enable or Disable for Port State.

If the port is part of a resilient link, you cannot enable or disable the port. You must first delete the resilient link, see “Resilience” on page 4-33 .

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View

menu, select

Zoom In

to display the

Info

Figure 4-11 Repeater Port Info Panel

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Configuring a Port 4-27

Select either Enable or Disable for Link Traps, Partition Traps, and Learn Stations.

Click on

Repeater Port Info

In the

Media Type

the port.

Partition State

repeating traffic, or has been automatically isolated (partitioned). If the port has partitioned check the cabling at both the port and any devices connected to the port, and check for network loops.

Link State

pair (10BASE-T) port.

Port State

elects whether the port can repeat information to

and from the network.

Link Traps

Selects whether a trap is sent to an IP/IPX-based network management application if the link state changes.

Shows the type of media connected to

Shows whether the port is on and

Shows the state of the link for a twisted

Enabled / Disabled

panel:

Partition Traps

Selects whether a trap is sent to an IP/IPX-based network management application if the partition state changes.

Learn Stations

Selects whether the source address of received frames is learned.

Attached Station

device attached to this port (the last device to transmit to this port).

The check boxes in the View Port box enable you to display statistics for the port and are described in “Monitoring” on page 4-18 .

The View Station box is always disabled for Quick Config Manager.

Enabled / Disabled

Shows the MAC address of the

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Hub Security

The OfficeConnect Hub 8/TP M provides flexible communication between your workstations and other network equipment. It is a good idea to configure security for the hub to protect your network from unwanted communications.

Security can be performed at two levels:

Port

■

— Configure security for an individual port.

Hub

— Configure security for one or more ports at a

time.

The way you set up your security depends on what you want to do. For example, if you have one device connected to a specific port, you would manage at

port

level to secure that connection. If you have several devices that you want to connect to any of a number of ports, you would manage at secure that connection.

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hub

level to

3Com’s security is very advanced but easy to set up. It works by learning in a number of ways what devices are communicating through its ports. You can configure the hub to react in two ways:

Disconnect Unknown Device (DUD)

■

— If the hub detects a communication from an unknown device at a port, it can disable that port to prevent further communication.

Need To Know (NTK)

■

— If a frame is to be forwarded from a port, the destination address of the frame is checked and if it does not match the device learnt for that port, the frame is scrambled to prevent the communication from being intercepted.

If you simply want to disable a port, see “Configuring a Port” on page 4-25 .

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Hub Security 4-29

Configuring Security at Port Level

To configure security for a port:

From the representation of the hub.

Double-click on the port for which you want to configure security.

Quick Config Manager displays the Port Configuration dialog box.

In the Port Configuration dialog box, select the

Security

Quick Config Manager displays the Port Security Configuration panel , as shown in Figure 4-12 .

In the Port Security Configuration panel at port level:

Authorized Addresses

■

View

menu, select

category.

No. of Addresses

addresses that can be authorized for this port. The list above it shows any addresses already configured for this port.

— Displays the number of

Zoom In

Shows the following:

to display the

Figure 4-12 Port Security Configuration Panel

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■

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MAC Address

— Allows you to enter the MAC address for a device to be authorized to transmit through this port. When you have typed the MAC address, click on

<Add

. Use the format

xx-xx-xx-xx-xx-xx for the MAC address.

<Add

■

— Adds the MAC address to the

Authorized addresses list.

Remove

■

— Removes the selected address or

addresses from the Authorized Address list.

DUD

(Disconnect Unknown Device) Allows you to

configure the learning and security mode of the port:

No Restriction

■

— Disables all security and

learning features.

Continually Learn

■

— The port learns the MAC addresses of the devices transmitting to this port and stores them in its address table. The maximum number of addresses learned by the ports is determined by the value shown in the No. of Addresses field. When the table is full, the port continues to learn new addresses, overwriting the addresses it learned previously.

The port never automatically switches to full security (for example Auto Learn), you have to do this manually. While learning, packets received on a port are not repeated out of the other ports.

Auto Learn

■

— The port learns the MAC addresses of the devices transmitting to this port and stores them permanently in its address table. The maximum number of addresses learned by the ports is determined by the value shown in the No. of Addresses field. When the table is full, the port automatically switches to Full Security mode and no other address are allowed to connect to this port. While learning, packets received on a port are not repeated out of the other ports.

Full Security

■

— Learning is disabled and only the addresses entered as authorized addresses for this port are allowed to transmit. If an unauthorized address is detected, a trap will be sent (if traps are configured) to an IP/IPX-based management station, and the port is disabled

Disable on Intrusion

(if

is selected).

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Hub Security 4-31

Disable on Intrusion

■

— Compares the source address of all frames received on the port to the authorized addresses for that port. If the source address of the incoming frame does not match the authorized addresses for this port, the port is disabled to prevent communication. This option is only valid when

Need To Know

Full Security

has been selected.

Allows you to configure which frames are forwarded to the selected port. If the port does not support configurable Need To Know, these options are grayed out:

Disabled

■

Enabled

— All frames are forwarded.

— The port examines the destination address of the frame. If it matches an authorized address for the port it is forwarded. If it does not, it is scrambled, so it can’t be read.

Allow Broadcasts

■

— In addition to Enabled, allows broadcast frames to be transmitted to the port.

Allow Broadcasts and Multicasts

■

— In addition to Enabled, allows broadcast and multicast frames to be transmitted to the port.

When you click on OK, the operation may fail for one of the following reasons:

■

The operation has timed out.

■

An Invalid MAC address (in other words, Multicast or Broadcast address) has been entered into the list of authorized addresses.

■

There is a duplicate address on another port.

If the address is on another port already and DUD is set to Full Security or Autolearn, you must remove the address from the other port before it can be assigned to the current port.

Configuring Security at Hub Level

To configure security for a hub:

Do one of the following:

■

Double-click on the graphical representation of the hub (but not on a port).

■

From the

In the General Info dialog box, choose the category.

Configure

menu, select

General Info

Security

...

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Figure 4-13 Security Configuration Panel

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Quick Config Manager displays the Security Configuration panel , as shown in Figure 4-13 .

In the Security Configuration panel at hub level:

Available

■

— This lists the hub’s ports, identifying them by port number and media type. Click on a port to select it from the list or perform a multiple selection.

Selected

■

— Shows the ports selected to be configured. Click on a port to select it from the list or perform a multiple selection.

Select>

■

— A dds the selected ports in the

Available list to the Selected list.

<Remove

■

— R emoves the selected ports from

the Selected list to the Available list.

All>>

■

— Adds all the available ports to the

Selected list.

<<All

■

— Removes all the selected ports from the

Selected list.

DUD

Need To Know

and

are the same as for port level, see “Configuring Security at Port Level” on page 4-29 .

Configure the security features for each port.

Click on

when the security setup is complete .

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Resilience 4-33

If a spare link could automatically pick up when the

Resilience

You can make your network more robust by adding

resilience

to it.

broken link failed, the network would appear to function normally to the user. At worst, a few packets would be corrupted or lost.

When a link fails, as shown in Figure 4-14 , all communication between equipment on each side of the link is lost. It would be very inconvenient for a manager to physically reinstate the network immediately and important communication might be lost.

Figure 4-14 A Failed Link Between Two Hubs

This is the concept of resilience. One link is on standby (called the if another link (called the Figure 4-15 . This pair is called a

Figure 4-15 A Resilient Link Pair

standby

link) waiting to take over

main

link) fails, as shown in

resilient link pair

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Resilient Links are available over twisted pair media (10BASE-T) because it carries a link test pulse which is used to decide whether the main link has failed and the standby link should take over. However, there is no such link signal over coaxial media (10BASE-2), so you cannot set up resilient links using the hub’s 10BASE-2 (Coax) port.

If you have more than two hubs there are a number of ways you can use resilience when linking them. Remember to follow hub connection requirements; always connect an MDIX port to an MDI port, setting the MDIX switch as appropriate, see “Connecting Hubs Using 10BASE-T” on page 2-10 .

When your network is in use, the hub that has been used to set up the resilient link pair, monitors the state of both the main link and the standby link. If the main link fails, the standby link becomes active. If the fault with the main link is solved, the standby link stays active and the main link acts like a standby link.

You can use management to view the status of your links, and to send

traps

(messages) to an IP/IPX-based network management application, if anything changes.

Setting Up a Resilient Link Pair

To set up a resilient link pair, you need to manage the hub that both links in the pair are connected to. You can set up to 4 resilient link pairs for the hub.

When you set up your resilient link pair, you only need to specify the ports that the main link and standby link are connected to.

Resilient Link Rules

Always follow these rules when setting up a resilient link pair:

■

Configure the resilient link pair at only one end of the link. In other words, only one hub controls each resilient link pair you set up.

■

Each resilient link pair can only have one main link and one standby link.

■

Each link must not belong to more than one resilient link pair.

■

For a port that is part of a resilient link pair:

Do not disable the link pulse generation.

■

Do not enable security for the port.

■

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CAUTION:

Remember that you must always follow the hub connection requirements when linking hubs together, which involves the use of port 8 and the MDI/MDIX switch.

If port 8 is already in use, you may need to use special crossover cabling for any further links you wish to make. Crossover cables allow you to make a connection between two MDIX ports. Contact your supplier for information on doing this.

To set up a resilient link pair:

Disconnect the hub which is to provide the standby port from the network. We recommend you do this, even though it is possible to set up links while still connected, to avoid loops being formed accidently.

Do one of the following:

■

Double-click on the graphical representation of the hub (but not on a port).

■

From the

Configure

menu, select

In the General Info dialog box, choose the

General Info

Resilience

...

category.

In the Resilience Links panel, click on

Create

Quick Config Manager displays the Create Resilient Pair dialog box, as shown in Figure 4-16 .

In the Create Resilient Pair dialog box, choose the port for the main link, followed by the port for the standby link.

Click on

Reconnect the hub with the standby port on it to the network.

When you have created a resilient link pair, it is added to the table and is color-coded as follows:

Green

■

— Both Main link and Standby link are OK.

Yel lo w

— One of the links is OK, the other has

failed.

Red

■

— Both Main link and Standby link have

failed.

The Resilience Links panel is displayed.

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In the Resilience Links panel:

Main Port

Standby Port

standby link.

Link State

operational or not. When operational either the main port or the standby port can repeat traffic.

Main State, Standby State

or the standby link is the active link in the resilient link pair.

Refresh

Create

create new resilient link pairs, by choosing the main and standby links in the resilient link pair.

Shows the port number of the main link.

Shows the port number of the

Shows whether the resilient link pair is

Shows whether the main

Refreshes the information in the panel .

Displays a dialog box which you can use to

Figure 4-16 Create Resilient Pair Dialog Box

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Using the Hub to Monitor Other Devices 4-37

Delete

Removes the resilient link pair from the table when an entry in the resilience table is selected. If you delete an entry in the resilience table, the current active link remains enabled and the current standby link is cancelled.

If the main link fails, the standby link becomes active. If the fault with the main link is solved, the standby link stays active and the main link acts like a standby link. You can swap the links around using management.

Using the Hub to Monitor Other Devices

Your hub can be used to monitor other devices on your network, and to notify an IP/IPX-based network management application should a problem occur with a device attached to it. The hub notifies the IP/IPX-based network management application by sending SNMP traps (messages) to it.

If you have a large network with many devices, this feature allows you to distribute device monitoring among those managed devices on your network, easing the load on the IP/IPX-based network management application.

This facility also allows you to monitor devices that are otherwise not directly manageable, such as workstations. Any device with an IP or IPX address can be monitored.

To add a device for the hub to monitor:

Do one of the following:

■

Double-click on the graphical representation of the hub (but not on a port).

■

From the

Configure

menu, select

General Info

...

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In the General Info dialog box, choose the category .

In the WorkGroup Monitor panel, click on

Quick Config Manager displays the Add Remote Poll dialog box, as shown in Figure 4-17 .

In the Add/Edit Remote Poll dialog box, enter the IP or IPX address of the device that you want the hub to poll.

Choose the rate at which the device is to be polled.

If the device is critical to the performance of your network, select a frequent rate. If the device is not important or on a remote network you can select a less frequent rate.

Select whether polling of this device is to be enabled or disabled.

You can have up to 10 polling session entries for the hub (poll 10 different devices) , all of which can be enabled. If you do not want to poll a device now but want to keep its information for future use, you can simply disable it by selecting Disable.

Click on

4: M

WorkGroup

Add

Figure 4-17 Add Remote Poll Dialog Box

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Additional Management 4-39

When you have added a device to the WorkGroup Monitor table, its entry is color-coded:

Green

■

— Device being polled and

communicating.

Red

■

— Device being polled but is not

communicating.

Blue

■

— Device not being polled by the hub.

In the WorkGroup Monitor panel:

Address

Rate

Shows the addresses of the polled devices.

Shows the frequency at which the device is

polled.

Round Trip

Shows the time taken for the device to

respond to the last poll.

Additional Management

If you want to perform any of the following additional management, use the VT100 screens, refer to Chapter 5 :

■

View the MAC address

■

Specify IPX information

■

Con n e ct a modem to the console port

■

Create new users, with different community strings, and disable different access methods

■

Poll a remote device to see if it is working

■

View the versions of the hub’s internal software and hardware

■

Download new software to the hub

Information

Shows the number of routers through which the hub communicates with the device or any information gathered during the poll.

You can edit or delete a Remote Poll by selecting it from the panel and clicking on the appropriate button.

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VT100

This chapter describes the additional management tasks you can perform using VT100®. For an overview of the management you can perform and the different ways you can make a management connection to the hub, see Chapter 3 .

Only the additional management screens are described in this chapter. For information on what the other screens do, refer to the corresponding Quick Config Manager screen s in Chapter 4 . The VT100 Screen Map on page 5-5 includes these references.

This chapter starts with an overview of the VT100 user interface. A map of all the screens is given, to help you to access any chosen screen.

In the descriptions of the options given in this chapter, the default values are underlined.

VT100 User Interface

We suggest you read through this section before you use the hub’s VT100 facility for the first time. Afterwards, you should only need it for reference.

Screens

Screens are divided into three main areas:

■

The header area, at the top of the screen, displays a title which tells you the subject of the screen.

■

The main part of the screen shows management information.

■

The message area, at the bottom of the screen, is used to display information and error messages.

The displayed screens may not be identical to those illustrated in this chapter. The contents of screens depend on your access level . Access levels are described in “Logon” on page 5-7 .

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5: A

Screen Components

The main part of a typical screen contains several different types of item. This table gives an example of each component, and explains its use:

Componen t

Enabled

◆

Choice Field

[005634]

Entry Field

Address:

Read-only information

◆

scription

ext enclosed in markers is a list, from which

you can select one option only.

To cycle through the options, press [Space].

ext enclosed in square brackets on the screen is an Entry Field. E ntry Field s allow y ou to enter d ata from the keyboar d, which m ay be text, decimal or hexadecimal data.

In some cases there is a default entry . To replace the default entry , simply type in the

ew value over it.

assword entry fields are hidden . Anything

typed is not shown on the screen.

To delete a single character, use [Delete] on a VT100 terminal or [Backspace] on a PC.

ext not enclosed in markers or square brackets is information that you cannot change.

VT100

Componen t

Button

monitor manager security

List Box

scription

ext for a button is shown in upper-case letters. A button performs an action. A menu screen such as the Main Menu consists of a number of buttons arranged in a column. Other screens have a row of buttons at the bottom.

To select a button, move the cursor to the button and press [Return].

The OK and CANCEL buttons appear on many screens. OK updates the hub according to the data in the fields of the screen, then returns you to the previous screen. CANCEL returns you to the previous screen without applying any changes

list box allows you to select one or more items from a list. Selected items are indicated by an asterisk (*) next to the item.

To select a single item, move the cursor (using the arrow keys) until the item is highlighted, then press [Return].

To select more than one item: for each item, move the cursor until the item is highlighted, then press [Space] to select the item (pressing [Space] again deselects the item). When all the desired items are selected, press [Return].

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Special Keystrokes

As well as the keystrokes previously described, there are several other keystrokes for controlling the VT100 interface. These keystrokes allow you to move the cursor around the screen, enter information and move from one screen to another:

[Tab]

[Ctrl]+[B] Moves the cursor to the next button.

When you have finished entering or changing data, [Ctrl]+[B] is very useful for skipping over the remaining fields.

[Ctrl]+[P] Returns you to the previous screen

[Ctrl]+[R] Refreshes the screen.

[Ctrl]+[K] Displays a list of the possible

Moves the cursor from one field to the next.

without actioning any inputs.

keystrokes.

VT100 User Interface

5-3

If you are using Telnet or a terminal emulation program, you may find that some control keys do not operate, or that they activate other functions. The Windows terminal emulator uses [Ctrl]+[H] as backwards deletion, whereas others use it for backward cursor movement. Consult the manual accompanying your Telnet or terminal emulation software before using the control keys.

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Repeater, Unit and Port Screens

There are three levels at which you can manage the hub using VT100:

Repeater

■

managing or viewing the device as a whole. Any stackable products, for example 3Com’s SuperStack ® range, can be logically stacked so that all the products form a single, logical repeater.

Unit

■

managing or viewing the hub.

Port

■

parameters and examine statistics for individual ports. This allows you to manage individual users or small workgroups.

3Com’s OfficeConnect ® range can be physically stacked but not logically stacked. Each unit remains a separate repeater regardless of how it is connected to other OfficeConnect units. Therefore, managing the hub at at

— If you manage at Repeater level, you are

— If you manage at Unit level, you are

— If you manage at Port level, you set up

Unit

Repeater

level.

level is the same as managing it

VT100

creen Map

Figure 5-1 shows how the menus and screens are related to each other. The numbers denote the pages in this chapter where the screen’s description can be found.

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creen Map

5-5

Figure 5-1 VT100 Screen Map

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Getting Started

This section explains logging on to the VT100 management facility, displaying the main menu and logging off.

Main Banner

If you are using a VT100 terminal connected (directly or through modems) to the console port, you need to perform the wake-up procedure. To do this, press [Return][Return] at the terminal.

By default, the hub automatically configures the baud rate of its console port to operate with the connected terminal or modem, provided the parity, stop bits and character size are identical to the connected terminal or modem .

If you are using Telnet or SLIP, the wake-up procedure is performed automatically.

VT100

Figure 5-2 Main Banner Screen

When the wake-up procedure is successfully completed, the main banner is displayed, as shown in Figure 5-2 .

Press [Return] to display the Logon screen.

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If you cannot see the main banner or it displays incorrectly, it may be that:

Your terminal is not configured as a VT100 terminal.

■

Check that your terminal is set up to operate with the same parameters that the hub’s console port uses. The console port’s autoconfigure option only operates if your terminal uses correct parameters. The maximum speed is 19200 baud. For information on the console port, see “Connecting a Modem to the Console Port” on page 5-13 .

Autoconfigure is disabled.

■

If you are unable to obtain the banner screen, it is possible that the autoconfigure option has been disabled. Check the configuration of the terminal.

If you cannot resolve the problem, refer to “Problems When Using VT100” on page 6-3 for more problem solving information.

Logon

You must enter your user name and password in the Logon screen, as shown in Figure 5-3 , before you can use the management facility.

Figure 5-3 Logon Screen

Getting Started

5-7

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If you are logging on for the first time (after installation or initialization), use one of the default user names and passwords shown in the following table. The user name to use depends on which access level you require:

Default

User Name

monitor

manager

security

Password Access Level

monitor

manager

security

Monitor — You can access but not change the operational parameters of the hub.

Manager — You can change the operational parameters of the hub but cannot add or delete users, download software or initialize the hub.

Security — You can access all the screens and change all manageable parameters.

VT100

At the earliest opportunity, the system manager should change the passwords for the default users. The system manager needs to log on as ‘manager’ and ‘monitor’ to change their passwords. For information on how to change a password, see “Editing Users” on page 5-18 .

Initializing the hub returns the passwords to their default values.

If you are not logging on as one of the default users, your system manager has assigned you a user name and password. The user name determines which of the three access levels (monitor, manager or security) you have.

The user name and passwords are case sensitive. To log on to the facility, enter your user name and password in the appropriate fields and select The Main Menu screen is displayed.

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Main Menu

The Main Menu, as shown in Figure 5-4 , is used for accessing the various VT100 screens.

Figure 5-4 Main Menu

If you are using the management facility for the first time, we suggest that you:

■

Set up logons for any other users and assign each user an appropriate security level. See “Configuring Local Security” on page 5-15 .

■

Assign new passwords for the default users. See “Editing Users” on page 5-18 .

To carry out a particular management task, scroll to the relevant option and press [Return]. This chapter describes the screens which perform management tasks that Quick Config Manager does not.

Logoff

If you have finished using the facility, select the

Logoff

option from the bottom of the Main Menu. If you accessed the facility using a Telnet session or modem connection, the connection is closed automatically.

Auto Logout

There is a built-in security timeout on the VT100 interface. If you do not press any keys for three minutes, the management facility warns you that the inactivity timer is about to expire. If you do not press a key within 10 seconds, the timer expires and the screen is locked (any displayed statistics continue to be updated, however). When you next press any key, the display changes to the Auto Logout screen, which requests that you enter your password again. If entered correctly, you are returned to the screen that was previously active. If entered incorrectly, you are returned to the Logon screen.

Getting Started

5-9

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Configuring and Viewing Setup Information

The Management Setup screen, as shown in Figure 5-5 , is used to configure IP, IPX and SLIP parameters for the hub. This screen also provides access to other screens for you to set up traps and console port parameters.

If you have no previous knowledge of IP, refer to Appendix B for more information.

VT100

MAC Address

cannot be changed.

Device IP Address

unique IP address for the hub, see “IP Addresses” on page B-1 . You may use the BOOTP facility (see the BOOTP Select field description) if your network has a BOOTP server, or enter it manually. If you change the device IP address, you must reset the hub to effect the change.

CAUTION:

always communicate with the hub, the IP subnet

192.168.101.x is permanently assigned to the SLIP port in addition to the user configurable SLIP address. Do not use this subnet for your Ethernet (network).

Device SubNet Mask

subnet mask. BOOTP does this automatically. For a class B IP address, 255.255.0.0 is suitable. If you change this field, reset the hub to effect the change.

The MAC address of the hub. This

If using IP, you need to enter a

To ensure that Quick Config Manager can

If using IP, enter a suitable

Figure 5-5 Management Setup Screen

Default Router

the default router on your network. BOOTP does this automatically. If you change this field, reset the hub to effect the change.

If necessary, enter the IP address of

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SLIP Address

SLIP (Serial Line Internet Protocol) allows IP to run over the console port instead of the network. SLIP allows you to use out-of-band Telnet or SNMP management, either locally or remotely through a modem. SLIP operates with any valid IP address. The default is 192.168.101.1 which is the address Quick Config Manager uses. If you change this field, reset the hub to effect the change.

CAUTION:

hanging the SLIP address and SLIP subnet mask can prevent Quick Config Manager from accessing the hub.

If you require more information about SLIP, read the Internet Activities Board document RFC 155.

SLIP SubNet Mask

Enter a suitable subnet mask. For a class C address, 255.255.255.0 (the default setting) is suitable. If you change this field, reset the hub to effect the change.

If you are using SLIP, ensure that Flow Control is not set to XON/XOFF . For information on the console port, see “Connecting a Modem to the Console Port” on page 5-13 .

BOOTP Select

Enabled / Disabled When enabled, BOOTP allows you to download the IP address, the SubNet Mask, and the Router IP address from a BOOTP server on your network. When operative, BOOTP checks that a valid IP address is not installed before sending out requests for the data.

It continues sending requests for data until one of three conditions is satisfied:

■

BOOTP is disabled

■

A valid BOOTP reply is received

■

You enter the address manually

When the IP parameters have been received, the hub resets automatically.

The following four fields are used for IPX addressing:

IPX Network

This field shows the address of the network for this protocol. This address is learned automatically from the local IPX router or NetWare File Server, and you should not need to change it.

Node

This field shows the node address of the hub,

which is learned automatically.

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Status

This field shows whether the data link protocol is enabled. Choose Disabled if you wish to prevent access for any reason, such as security considerations.

Data Link Protocol

IPX data link layer protocol.

to action your selections for this screen. You are returned to the Main Menu.

If you have changed the parameters, you need to reset the hub to effect the changes.

SETUP TRAPS

button is highlighted to set up the parameters for traps.

CONSOLE PORT

PORT

parameters.

5: A

Enabled / Disabled

This field shows the name of the

Press [Return] when the

button is highlighted to set up the console port

button is highlighted

VT100

SETUP TRAPS

CONSOLE

Setting Up Traps

The Trap Setup screen, as shown in Figure 5-6 , is used to set up the network to an IP/IPX-based network management application which inform the network manager of the status of your hub.

Figure 5-6 Trap Setup Screen

traps

. Traps are messages sent across

CANCEL

highlighted to abandon this screen without actioning any changes, and return to the Main Menu.

Press [Return] when the

CANCEL

button is

Your Transcend IP/IPX-based network manager may automatically set up the trap destination addresses for you. Check the accompanying documentation.

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nnecting a Modem to t he Console Port 5-13

IP or IPX Address

remote network management station to which SNMP traps should be sent.

Community String

very simple method of authentication between the hub and the remote network management station. You can enter any text string of up to 32 characters (case sensitive). The remote network management station must be configured to look for traps sent with this community string, otherwise it will ignore the traps. The default community string is

Throttle

station receiving too many traps at once, you can configure the hub to transmit traps with a delay between each trap. If several traps are generated at once, they will be transmitted with the specified delay between them. The unit of throttle is one thousandth of a second. The default value is 100, which gives a delay of one tenth of a second between each transmission. If you set the throttle to 0, traps will be sent as soon as they are generated.

If your trap configuration results in a large number of traps being generated within a short period of time, it is possible that some traps will not be sent.

To prevent a remote network management

Enter the IP or IPX address of the

The community string allows a

public

nnecting a Modem to t he Console

Port

The Console Port Setup screen is shown in Figure 5-7 . The console port is already correctly configured by default. Only alter these default settings if you are connecting a modem to the console port.

CAUTION:

unless you fully understand what you are doing. Incorrect settings will lock you out from the hub when you select OK, and you will have to contact your supplier for information on recovering management communication.

Do not change any of these settings

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Figure 5-7 Console Port Setup Screen

If you alter the console port settings and select you terminate any existing session using the console port. To avoid terminating the session completely , ensure that the settings are correct and that the connected equipment’s settings match the new configuration.

5: A

VT100

If you are unsure of the correct settings to use, refer to the manual for your terminal or modem. If you change the settings by accident, return them to their default settings (shown on these pages as the underlined values).

Serial Connection

Select Modem i f you want to manage the hub through a modem. Otherwise, leave as Terminal. The cable you require for connecting a modem is shown in “Cabling” on page A-2 .

Terminal / Modem

If you change the console port parameters with Auto Config already set to Enabled, or if you change Auto Config to Enabled, you need to perform the

wake-up

re-established, see “Main Banner” on page 5-6 .

procedure before communication is

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Flow Control

RTS - CTS Bidirectional / RTS - CTS Unidirectional Select the flow control option that corresponds with your terminal or modem.

Speed

19200 Select the baud rate for your terminal or modem. The hub can automatically configure the terminal speed to work with your VT100 terminal. Note that the setting made by automatic configuration is not displayed on the screen. Leave this field as Auto-Config if you require automatic configuration. To start automatic configuration, the wake-up procedure must be performed at your VT100 terminal.

Char Size

Modem Dial String Configured Modem Link Configured Modem Link Configured

by suppliers setting up the special modem dial-out feature, see “Remote Management Service” on page 3-7 .

NONE / XON/XOFF /

Auto-Config / 1200 / 2400 / 4800 / 9600 /

Parity

and

Stop Bit

are all fixed.

Hub Login Over

Hub Logout Over

and are fields reserved for use

Configuring Local Security

The Local Security screen, as shown in Figure 5-8 , is used for preventing various types of management connection. This option is available only for users

security

with

The Local Security screen shows a table displaying every combination of access method (console port, Telnet or SNMP) and access level. For example, the top left field shows whether console port access by users with

monitor

access level.

access level is enabled or disabled .

Figure 5-8 Local Security Screen

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The access levels are defined as:

Monitor

■

— This allows the user to view the essential operations of the hub and to establish whether or not the hub is operating correctly. A user at this level cannot change the operating parameters of the hub.

Secure Monitor

■

— In this implementation, Secure

Monitor has the same rights as Monitor.

Manager

■

— This allows the user to monitor and change the operational parameters of the hub. The user cannot create or delete other users, re-initialize the hub or download a software image.

Specialist

■

— In this implementation, Specialist has

the same rights as Manager.

Security

■

— This allows the user to access all the management operations. This level of security should be assigned only to the system administrator or somebody with the system administrator’s responsibilities.

To prevent you from locking yourself out from the hub completely, console port access is always kept enabled for the

security

access level.

VT100

Console Por t

Enabled / Disabled To prevent access to the management facilities through the console port, disable access to the facility for each access level. To allow you to configure the hub locally in the event of problems on your network, we suggest that you change the default password for the permanently-enabled security access level, see “Editing Users” on page 5-18 .

Remote Telnet

Enabled / Disabled Telnet is an insecure protocol. You may wish to disable all access to the management facilities through Telnet if there is important or secret data on your network.

Community SNMP

Enabled / Disabled The hub can be managed through SNMP using a remote network manager. Community SNMP does have some simple security features but it is an insecure protocol. You may wish to disable all access to the management facilities through Community SNMP if there is important or secret data on your network.

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Configuring Users

Creating Users

The Create User screen, as shown in Figure 5-9 , is used to add new users. This option is available only for users with to 10 users, including the three default users. Up to three users can concurrently access the management facility using Telnet. There is no limit to the number of SNMP remote management sessions.

Figure 5-9 Create User Scree n

security

access level. There can be up

User Name

can be up to 10 characters. The user name is case sensitive.

Password

password can be up to 10 characters. The password is case sensitive and is not displayed on the screen.

Access Level

Specialist / Security Enter an appropriate access level for the new user by cycling through the options using the space bar.

Community String

string is the same as the User Name. You can change this string to any text string of up to 32 characters. The community string is used only for SNMP access. The remote network manager must be configured to use the same community string.

Each user’s community string must be unique.

Enter the name of the user. The name

Enter a password for this user. The

Monitor / Secure Monitor / Manager /

By default, the community

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Editing Users

The Edit User screen, as shown in Figure 5-10 , is used to change your own password or community string. This option is available only for users with

security

access level.

No user can directly change another user’s password or community string. If you are a system administrator and wish to change another user’s password, you need to log on as the other user.

5: A

VT100

The options are similar to the Create User screen, see “Creating Users” on page 5-17 . The main differences are the password fields. You must type in your current password in the you can change any fields. To set a new password, enter the password in both the

Confirm Password

If you enter different values for the

Confirm Password

when the pressed, a null password is set for the user. The user can log in but if an attempt is made to change the password again, the message ‘Old Password Field Not Completed’ is displayed.

If you forget your password, refer to the advice in “Problems When Using Quick Config Manager” on page 6-3 .

button is selected. If [Return] is then

Old Password

fields.

fields, an error message is displayed

field before

New Password

and

Figure 5-10 Edit User Screen

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Polling a Remote Device 5-19

Deleting Users

The Delete Users screen, as shown in Figu re 5-11 , is used to remove users from the User List. The User List shows all of the users configured for the hub. This option is available only for users with access level.

security

Polling a Remote Device

The Remote Poll screen, as shown in Figu re 5-12 , is used to see if a remote device is responding, by sending a message forcing a response from the target device. This determines if there is a path or a congested path between this device and other devices on the network. This option is available only for users with

manager

access level or higher.

Figure 5-11 Delete Users Screen

Select the users to delete from the List Box using the spacebar, then move to the press [Return]. You cannot delete the current user (the user name you used to log on) or any of the default users (monitor, manager or security).

DELETE USERS

button and

Figure 5-12 Remote Poll Screen

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The Office Connect Hub 8/TP M must have an IP or IPX address configured for it, to enable it to receive responses from the device it is polling.

Target Address

device to poll.

If there are multiple instances of the Remote Poll screen, they share the same Target Address. This may happen if there are multiple Telnet sessions, or a console port session and a Telnet session. The last address entered is the address that is polled.

Round Trip Time

between the time the last frame was sent to the target device and the time a response was received by the hub. If there is no response within a few seconds, no reply is shown. Also displayed is the number of router hops and, if set, the time-to-live for the frame.

The hub can be configured to automatically poll several devices at regular intervals, and report back to an IP/IPX-based network management application if there is no response.

5: A

Enter the IP or IPX address of the

This is the interval in milliseconds

VT100

Viewing Internal Version Numbers

The Status screen, as shown in Figure 5-13 , shows information about the hub.

Make a note of this information as your supplier may need to know it should you contact them with a problem.

Figure 5-13 Status Screen

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Downloading a Software Upgrade 5-21

System Up Time

hub has been running since the last reset.

Number of Resets

number of resets since the hub was first installed, or initialized.

Last Reset Type

last reset.

Management Module Hardware Revision

the hardware version of the management board inside the hub.

Flash EPROM Software Revision

number of the software image stored in the management board’s memory .

PROM Software Revision

of software stored in the Boot PROMs on the management board.

This field indicates how long the

This field shows the total

This field indicates the cause of the

his is

his is the version

This is the version number

Downloading a Software Upgrade

The Software Upgrade screen, as shown in Figure 5-14 , is used to download a new version of the software image to the hub. This option is available only for users with

Figure 5-14 Software Upgrade Screen

When 3Com issues a new version of the hub SmartAgent® software, you can obtain the software image from 3Com bulletin board services, see “3Com provides easy access to technical support

security

access level.

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information through a variety of services. This appendix describes these services.” on page C-1 .

The software download can be performed through a serial connection (over SLIP) but it is much faster over the network.

File Name

the software image to be downloaded to the hub. You must place the image file where it is accessible to the TFTP load request. Check with your supplier if you are unsure where to place the image file.

You may wish to download the file from another directory. If so, you must give the full path to the file and the filename, using a maximum of 30 characters.

Server Address

device where the software file containing the image of the management facility can be found.

When the download is complete, the hub is reset.

5: A

Enter the name of the file that contains

Enter the IP or IPX address of the

Select this button to start the software download.

VT100

concern for a successful download as it always result in a correct trap status.

If the software download fails, any traps that are sent to an IP/IPX-based network manager, reporting the failure, may indicate an incorrect status. This is not a

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The Office Connect® Hub 8/T PM has been designed to aid you when detecting and solving possible problems with your network. These problems are rarely serious, the cause is usually a disconnected or damaged cable, or incorrect configuration. If this chapter does not solve your problem, contact your supplier for information on what to do next.

Perform these actions first:

■

Ensure all equipment is powered on.

■

Power each hub off, wait about 5 seconds and then power them on so they perform a self-test. The self-test only takes a few seconds, during which all LEDs light. Port Status LEDs light yellow.

Isolating a Problem

A good way of isolating a problem is to see whether it occurs on a particular port only. This can be done by:

■

Using a different port to see if the problem still exists.

■

Using management to view how a port has been set up. In particular, see if the port is:

Partitioned because of a network loop

■

Disabled by management

■

Part of a resilient link pair

■

Performing security

■

Check the Alert LED and if lit, use the Alerts dialog box in Quick Config Manager to see what condition is causing it to light.

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6-2

6: P

Problems When Using Your Hub

Power LED not lit.

connection. If there is still no power, you may have a faulty power adapter which needs replacing with another OfficeConnect power adapter.

any other power adapter with the hub.

Alert LED continuously lit.

the Alert LED, it lights for two default conditions. It could be that there is either continual excessive use of your network (over 80%) or, more likely, a 10BASE-T port has partitioned due to a loop in your network (in which case a Port Status LED is yellow). Examine your connections and remove the loop. Each piece of equipment needs only one connection to your Office Connect h ub.

If you have configured the Alert LED, check the Alerts dialog box in Quick Config Manager to see what conditions have caused the LED to light, see “Setting Up the Alert LED” on page 4-15 .

Check your power adapter

If you haven’t configured

Do not use

Port Status LED yellow for a 10BASE-T port.

It is likely that there is a loop in your network which has caused this port to partition. Examine your connections and remove the loop. Each piece of equipment needs only one connection to your Office Connect h ub.

Port Status LED not lit for a 10BASE-T port that has a connection.

connection. Check you are using a ‘Straight-through’ 10BASE-T cable which is properly connected at both ends, is not damaged, and that the equipment it is connected to is powered on and operating correctly.

Link between two OfficeConnect hubs not working.

information given in “Connecting OfficeConnect Hubs Together” on page 2-8 . With 10BASE-T it is likely an MDI/MDIX switch is set incorrectly. With 10BASE-2 (Coax) it is likely a terminator ( end piece ) is not fitted properly; this would cause the Coax Port Status LED to light yellow (partition).

There is a problem with this

heck your hub connections; follow the

Check that the Alert LED Test is disabled, in the Alerts dialog box. If it is not, select Disable and click on OK.

3COM 3C16710 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual