3com CoreBuilder 5000 User Guide

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CoreBuilder™ 5000

Ethernet 20-Port and 40-Port 10BASE-T Module User Guide

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Document Number 17-00540-3 Published May 1997

3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8145

Copyright © 3Com Corporation, 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 Corporation. Portions of this document are reproduced in whole or part with permission from third parties.

3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Corporation to provide notification of such revision or change.

3Com Corporation 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 products or programs described in this documentation at any time.

UNITED STATES GOVERNMENT LEGENDS:

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

For units of the Department of Defense:

Restricted Rights Legend: Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c) (1) (ii) for Restricted Rights in Technical Data and Computer Software Clause at 48 C.F.R. 52.227-7013.

For civilian agencies:

Restricted Rights Legend: Use, reproduction, or disclosure is subject to restrictions set forth in subparagraph (a) through (d) of the Commercial Computer Software – Restricted Rights Clause at 48 C.F.R. 52.227-19 and the limitations set forth in the 3Com Corporation 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 Unpublished rights reserved under the copyright laws of the United States.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 hardcopy 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 sent to you.

Federal Communications Commission Notice

This equipment was tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case you must correct the interference at your own expense.

Canadian Emissions Requirements

This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.

Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.

EMC Directive Compliance

This equipment was tested and conforms to the Council Directive 89/336/EEC for electromagnetic compatibility. Conformity with this directive is based upon compliance with the following harmonized standards:

EN 55022 – Limits and Methods of Measurement of Radio Interference EN 50082-1 – Electromagnetic Compatibility Generic Immunity Standard: Residential, Commercial, and

Light Industry Warning: This is a Class A product. In a domestic environment, this product may cause radio interference, in

which case you may be required to take adequate measures. Compliance with this directive depends on the use of shielded cables.

Low Voltage Directive Compliance

This equipment was tested and conforms to the Council Directive 72/23/EEC for safety of electrical equipment. Conformity with this directive is based upon compliance with the following harmonized standard:

EN 60950 – Safety of Information Technology Equipment

VCCI Class 1 Compliance

This equipment is in the 1st Class category (information equipment to be used in commercial or industrial areas) and conforms to the standards set by the Voluntary Control Council for Interference by Information Technology Equipment aimed at preventing radio interference in commercial or industrial areas.

Consequently, when the equipment is used in a residential area or in an adjacent area, radio interference may be caused to radio and TV receivers, and so on.

Read the instructions for correct handling.

Fiber Cable Classification Notice

Use this equipment only with fiber cable classified by Underwriters Laboratories as to fire and smoke characteristics in accordance with Section 770-2(b) and Section 725-2(b) of the National Electrical Code.

UK General Approval Statement

The CoreBuilder 5000 Integrated System Hub and ONline System Concentrator are manufactured to the International Safety Standard EN 60950 and are approved in the U.K. under the General Approval Number NS/G/12345/J/100003 for indirect connection to the public telecommunication network.

Trademarks

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

3Com, Boundary Routing, CardFacts, EtherLink, LANplex, LANsentry, LinkBuilder, NETBuilder, NETBuilder II, NetFacts, Parallel Tasking, SmartAgent, TokenDisk, TokenLink, Transcend, TriChannel, and ViewBuilder are registered trademarks of 3Com Corporation.

3TECH, CELLplex, CoreBuilder, EtherDisk, EtherLink II, FDDILink, MultiProbe, NetProbe, and ONline are trademarks of 3Com Corporation.

3ComFacts is a service mark of 3Com Corporation. The 3Com Multichannel Architecture Communications System is registered under U.S. Patent

Number 5,301,303. AT&T is a registered trademark of American Telephone and Telegraph Company. Banyan and VINES are registered trademarks of Banyan Systems Inc. CompuServe is a registered trademark of CompuServe, Inc. DEC, DECnet, DELNI, POLYCENTER, VAX, VT100, VT220, and the Digital logo are trademarks of Digital

Equipment Corporation. Hayes is a registered trademark of Hayes Microcomputer Products. OpenView is a registered trademark of Hewlett-Packard Company. Intel is a registered trademark of Intel Corporation. AIX, IBM, and NetView are registered trademarks of International Business Machines Corporation. Microsoft, MS-DOS, Windows, Windows 95, and Windows NT are registered trademarks of

Microsoft Corporation. V30 is a trademark of NEC Corporation. NetWare and Novell are registered trademarks of Novell, Incorporated.

IPX is a trademark of Novell, Incorporated. OSF and OSF/Motif are registered trademarks of Open Software Foundation, Inc. ONC, OpenWindows, Solaris, Solstice, Sun, Sun Microsystems, SunNet Manager, and SunOS are trademarks

of Sun Microsystems, Inc.

iii

SPARCstation is a trademark licensed exclusively to Sun Microsystems Inc. OPEN LOOK is a registered trademark of Unix System Laboratories, Inc. UNIX is a registered trademark of X/Open Company, Ltd. in the United States and other countries. Other brand and product names may be registered trademarks or trademarks of their respective holders.

HOW TO USE THIS GUIDE

Audience 1 Structure of This Guide 2 Document Conventions 3 Related Documents 4

3Com Documents 4 Reference Documents 4

1 INTRODUCTION

CoreBuilder 5000 Ethernet 20/40-Port Module Description 1-2 CoreBuilder 5000 Ethernet 20/40-Port Module Features 1-2 CoreBuilder 5000 Ethernet 20/40-Port Module Benefits 1-3

20-Port Sample Module Application 1-5 Theory of Operation 1-6 Where to Go From Here 1-6

2 DESIGNING AND EXPANDING THE NETWORK

Understanding General Network Configuration Rules 2-1

Before Configuring Your Network 2-2

Basic Network Rules 2-2

LAN Product Distances 2-4 Configuring Fiber Backbone, Twisted Pair to-the-Desk 2-5

Fiber Backbone Configuration Rules 2-5

Configuration Example of Fiber Backbone, Twisted Pair

to-the-Desk 2-6

Fiber Backbone Configuration Verification 2-6 Configuring Twisted Pair Backbone, Twisted Pair to-the-Desk 2-7

Twisted Pair Backbone Configuration Rules 2-7

Configuration Example of Twisted Pair Backbone, Twisted

Pair-to-the-Desk 2-8

Using Patch Panels 2-9 Using Module Workgroups 2-9

Workgroup Definition 2-9 Dividing the Network into Workgroups 2-10

Workgroup Example 2-10

Setting Redundant Links 2-13

Setting Redundancy Between Two Ports on One 40-Port Module 2-14

Setting Redundancy Between Ports On Two 20/40-Port Modules 2-15

Where to Go From Here 2-16

3 INSTALLING AND OPERATING THE MODULE

Precautionary Procedures 3-2 Unpacking Procedures 3-2 Quick Installation 3-3 Setting DIP Switches 3-4

Using DIP Switches 3-4 Setting the DIP Switches 3-4

DIP Switch Definition 3-5 Installing the Module 3-7 Configuring the Module 3-10

Enable/Disable/

Shutdown Ports 3-11

Set Port Redundancy 3-12

Set Remote Diagnostics 3-12

Enable/Disable Link Integrity 3-13

Set Alert Filter 3-13

Set Auto Polarity 3-14

Set Port Squelch 3-14

Network Selection 3-15

Assigning Ports On the Module to a Network 3-15 Assigning a Monitor Card to a Network 3-15

Showing Module Configurations 3-16

Show Module Command 3-16

Show Port Command 3-17 Attaching the Network Monitor Card 3-18 Gathering Statistics 3-19

Gathering Statistics 3-19

Monitoring the Network 3-19

Monitor Command 3-20 Show Counter Command 3-21

Monitoring the Front Panel 3-22

Module Status LED 3-22

Port Status and Activity LEDs 3-22 Verifying LEDs and the Network 3-24

Using the CoreBuilder 5000 Controller Module to Verify Bi-Color LED

Operation 3-25

Using the DMM to Verify Network Connections 3-25 Where to Go From Here 3-26

4 TROUBLESHOOTING

Troubleshooting Using the Module Status LED 4-2 Troubleshooting Using the Port Status LEDs 4-3 Technical Assistance 4-4 Where to Go From Here 4-4

A SPECIFICATIONS

Electrical Specifications A-1 Environmental Specifications A-2 Mechanical Specifications A-2 General Specifications A-2 Twisted Pair Connectors and Cables A-3

Twisted Pair Connectors A-3

Twisted Pair Cables A-4

Connecting Twisted Pair Cables A-4

vii

B TECHNICAL SUPPORT

Online Technical Services B-1

World Wide Web Site B-2 3Com Bulletin Board Service B-2

Access by Analog Modem B-2

Access by Digital Modem B-2 3ComFacts Automated Fax Service B-3 3ComForum on CompuServe Online Service B-3

Support From Your Network Supplier B-4 Support From 3Com Corporation B-5 Returning Products for Repair B-6 Accessing the 3Com MIB B-6 Contacting 3Com Technical Publications B-7

INDEX

3COM CORPORATION LIMITED WARRANTY

viii

FIGURES

1-1 CoreBuilder 5000 Ethernet 20-Port and 40-Port Module 1-4 1-2 Typical 20-Port Module Application 1-5 2-1 Sample Configuration Distance Calculation 2-6 2-2 Unshielded Twisted Pair Network 2-8 2-3 Typical Corporate Organizational Structure 2-10 2-4 20-Port Module Workgroup Port Allocation 2-12 2-5 Redundant Twisted Pair Configuration 2-14 3-1 20/40-Port Module and DIP Switch Location 3-5 3-2 Installing a CoreBuilder 5000 Module 3-8 3-3 Opened and Closed Module Ejectors 3-9 3-4 20-Port Module Cable Connection 3-10 3-5 Remote Diagnostics Example 3-12 3-6 Attaching the CoreBuilder 5000 Ethernet Monitor Card 3-18 3-7 20-Port and 40-Port Module Faceplate 3-23

A-1 RJ-45 Connector Pinouts A-4

TABLES

2-1 Seven Basic Network Rules 2-2 2-2 LAN Product Equivalent Distances 2-4 2-3 Sample Network Reorganization 2-11 3-1 Quick Installation Checklist 3-3 3-2 Channel Select DIP Switch Settings 3-6 3-3 20/40-Port Module LED Interpretations 3-24 4-1 Module Status LED Troubleshooting 4-2 4-2 Port Status LED Troubleshooting 4-3

HOW TO USE THIS GUIDE

This guide explains how to install and operate the 3Com CoreBuilder throughout this guide as the 20/40-Port module). This guide also includes information on monitoring this module using a 3Com appendix explains cabling guidelines and options for the 20/40-Port module.

Before installing or using the 20/40-Port module, read Chapters 1, 2, and 3 of this guide for basic installation and operation instructions.



5000 Ethernet 20/40-Port 10BASE-T Module (referenced

CoreBuilder 5000 Distributed Management Module. An

Audience This guide is intended for the following people at your site:

■ Network manager or administrator

■ Hardware installer

2 HOW TO USE THIS GUIDE

Structure of This Guide

This guide contains the following chapters and appendix:

Chapter 1, Introduction – Introduces the functions and features of the CoreBuilder 5000 Ethernet 20/40-Port 10BASE-T Module.

Chapter 2, Designing and Expanding the Network – Shows possible network configurations using the CoreBuilder 5000 hub and the CoreBuilder 5000 Ethernet 20/40-Port Module.

Chapter 3, Installing and Operating the Module – Provides illustrated procedures for installing the 20/40-Port module into the CoreBuilder 5000 hub. Also shows front panel LEDs and DIP switches on the module and describes network management commands.

Chapter 4, Troubleshooting – Provides help in isolating and correcting problems that may arise when installing or operating this module.

Appendix A, Specifications – Provides electrical, environmental, and mechanical specifications for the module. Provides information on RJ-45 connectors and twisted pair cables.

Appendix B, Technical Support – Lists the various methods for contacting the 3Com technical support organization and for accessing other product support services.

Index

Document Conventions 3

Document Conventions

The following document conventions are used in this manual:

Convention Indicates Example

Courier text User input In the Agent Information Form,

enter MIS in the New Contact field.

System output After pressing the Apply button, the

Bold command string Path names Before you begin, read the

User-substituted identifiers

Capitalized text in plain brackets

Italics Text emphasis,

Icon Notice Type Alerts you to...

Information note Important features or instructions

Keyboard entry by the user

document titles

system displays the message Transmitting data.

readme.txt file located in

/usr/s nm /agen ts.

Type your password and press [ENTER].

Ensure that you press the Apply button after you add the new search parameters.

Caution Risk of personal safety, system damage, or loss

Warning Risk of severe personal injury

of data

4 HOW TO USE THIS GUIDE

INTRODUCTION

This chapter describes the 3Com CoreBuilder 10BASE-T Module (Model Number 6120M-TPP) and the 40-Port 10BASE-T Module (Model Number 6140M-TPP). For more information on the CoreBuilder 5000 hub, refer to the CoreBuilder 5000 Integrated System Hub Installation and Operation Guide.

This chapter contains the following sections:

■ CoreBuilder 5000 Ethernet 20/40-Port Module Description

■ CoreBuilder 5000 Ethernet 20/40-Port Module Features

■ CoreBuilder 5000 Ethernet 20/40-Port Module Benefits

■ Theory of Operation

■ Where to Go From Here

™

5000 Ethernet 20-Port

1-2 INTRODUCTION

CoreBuilder 5000 Ethernet 20/40-Port Module Description

CoreBuilder 5000 Ethernet 20/40-Port Module Features

The 3Com® CoreBuilder 5000 Ethernet 20/40-Port 10BASE-T Module is a port-switching module which:

■ Supports RJ-45 based 10BASE-T wiring

■ Enables users to assign a backplane segment at the port level of the

module

The CoreBuilder 5000 Ethernet 20-Port 10BASE-T Module offers a single slot solution for networks utilizing RJ-45 connectors in their 10BASE-T installation. The CoreBuilder 5000 Ethernet 40-Port 10BASE-T Module offers an additional 20 ports in a two slot solution for networks with a large environment of RJ-45-based 10BASE-T wiring.

The 20/40-Port module connects up to 20 or 40 devices (PCs, terminals, printers, modems) to the 3Com CoreBuilder 5000 hub. The module provides 20 or 40 twisted pair Ethernet ports which may be switched individually to any of the CoreBuilder 5000 backplane channels or extended (isolated) segments.

The CoreBuilder 5000 Ethernet 20/40-Port 10BASE-T Module provides the following features:

■ Remote Diagnostics Mode – Checks driver and receiver integrity.

■ Private Line Card – Supports security through the private line card

(PLC). The PLC provides continuous eavesdropping and intrusion protection without impacting network performance.

■ Two Daughter Cards – Allows you to connect network monitor

cards for network management.

■ Hot swap capability – Allows you to install or remove the module

without having to power down the hub.

■ Scalable network management architecture – Enables you to

gather Ethernet and Remote Network Monitoring (RMON) network statistics for any of the CoreBuilder 5000 backplane segments. Includes up to two Network Monitor Cards (NMC) per module for in depth monitoring of the network.

In addition, both modules support Repeater Management Information Base (MIB) statistics without the need for a network monitor card.

CoreBuilder 5000 Ethernet 20/40-Port Module Benefits 1-3

CoreBuilder 5000 Ethernet 20/40-Port Module Benefits

The CoreBuilder 5000 Ethernet 20/40-Port 10BASE-T Module provides the following benefits:

■ Provides per-port switching to all eight of the CoreBuilder 5000

backplane segments and isolated segments. Supports up to eight segments, simultaneously, in any combination.

■ Provides IEEE Repeater statistics gathering for monitoring of the

CoreBuilder 5000 hub’s security and network management architecture.

■ Offers high port density at a low cost per port.

■ Supports up to 100 meters on 10BASE-T-compliant unshielded

twisted pair (UTP) wiring as well as shielded twisted pair (STP) wiring.

■ Supports the CoreBuilder 5000 Private Line Card for private Ethernet

conversations.

■ Maintains inventory information for the 20/40-Port module in

non-volatile RAM (NVRAM). Information includes the module serial number, power requirements, power class settings (for example, powerup priority), and date of manufacture and a user note pad for entering installation-specific information.

■ Supports CoreBuilder 5000 hub power management architecture

which enables administrators to prioritize the allocation of power to modules.

1-4 INTRODUCTION

Figure 1-1 illustrates the CoreBuilder 5000 Ethernet 20-Port and

40-Port 10BASE-T Modules.

RJ-45 (ports 1 to 20)

10X

11X

12X

13X

14X

15X

16X

17X

18X

19X

20X

10BASE-T E20PS-TP

TRAFFIC STA

MOD STA

10X

11X

12X

13X

14X

15X

16X

17X

18X

19X

20X

Module Status LED

Bi-Color Port Status/Activity LEDs

TRAFFIC STATUS

MODULE

STATUS

21X

22X

23X

24X

25X

26X

27X

28X

29X

30X

10X

31X

11X

12X

32X

13X

33X

13X

34X

14X

35X

15X

16X

36X

17X

37X

38X

18X

39X

19X

40X

20X

RJ-45 (ports 1 to 40)

Figure 1-1 CoreBuilder 5000 Ethernet 20-Port and 40-Port Module

CoreBuilder 5000 Ethernet 20/40-Port Module Benefits 1-5

20-Port Sample

Module Application

This section describes a sample application for the 20-Port module.

Attaching either CoreBuilder 5000 Ethernet 10BASE-T Module directly to the hub using an RJ-45 cable provides the following connections:

■ 20-Port Module – Provides 20 twisted pair ports

■ 40-Port Module – Provides 40 twisted pair ports

You can attach the CoreBuilder 5000 Ethernet 20-Port 10BASE-T Module using an RJ-45 cable directly to the hub which provides connections for the 20 twisted pair ports. The CoreBuilder 5000 Ethernet 40-Port 10BASE-T Module has the same application except the 40-Port module offers an additional 20 ports and occupies a second slot.

20-Port module

CoreBuilder 5000 hub

RJ-45 cables

Figure 1-2 Typical 20-Port Module Application

1-6 INTRODUCTION

Theory of Operation

Where to Go From Here

The CoreBuilder 5000 Ethernet 10BASE-T 20/40-Port Module offers a solution for customers utilizing RJ-45 connectors in their 10BASE-T installation.

Both modules offer:

■ Per-port switching connectivity for STP and UTP 10BASE-T networks

■ Support for network monitoring and private line cards

■ Easy configuration using the CoreBuilder 5000 Manager

■ 20 or 40 twisted pair Ethernet ports which you can switch

individually to any of the 8 CoreBuilder 5000 backplane channels or 8 extended segments in any combination of 8

Once you are familiar with the CoreBuilder 5000 Ethernet 20/40-Port 10BASE-T Module, evaluate the environment in which you plan to use the module and go to Chapter 2. Chapter 2, Designing and Expanding the Network, describes cabling considerations and configuration examples specific to the 20/40-Port module in the CoreBuilder 5000 hub.

DESIGNING AND EXPANDING THE

NETWORK

This chapter describes how to configure networks that use the CoreBuilder 5000 hub and the CoreBuilder 5000 Ethernet 20/40-Port 10BASE-T Module.

This chapter contains the following topics:

■ Understanding General Network Configuration Rules

■ Configuring Fiber Backbone, Twisted Pair to-the-Desk

■ Configuring Twisted Pair Backbone, Twisted Pair to-the-Desk

■ Using Patch Panels

■ Using Module Workgroups

■ Setting Redundant Links

■ Where to Go From Here

CAUTION: To ensure proper operation, install all equipment using only approved cables. Refer to Appendix A, Specifications, for information on twisted pair connector and cable requirements.

Understanding General Network Configuration Rules

This section describes general rules for configuring an Ethernet network using fiber as the backbone medium, and twisted pair as the horizontal medium. It also provides rules to ensure that your network configuration conforms to distance limitations imposed by Ethernet and networking equipment.

The following topics are discussed:

■ Before Configuring Your Network

■ Basic Network Rules

■ LAN Product Distances

2-2 DESIGNING AND EXPANDING THE NETWORK

Before Configuring

Before configuring your network, consider your:

Your Network

■ Network size from end-to-end. Is it:

■ 100 meters

■ 1000 meters

■ 4000 meters

■ Greater than 4000 meters

■ Plans for expansion. Once the network expands beyond a certain

size, you may need to add a switch or an additional internetworking device.

Basic Network Rules Table 2-1

■ The seven basic network rules to keep in mind when you construct

your network

■ 3Com recommendations for these rules

For hardware-specific information on the 20/40-Port module, refer to Appendix A, Specifications.

Table 2-1 Seven Basic Network Rules

lists:

Rule Definition Recommendations/Notes 1 If possible, use 10BASE-FB

as the backbone medium.

Use 62.5 micron cable to conform with IEEE 10BASE-F and ANSI FDDI standards.

Use ST-type connectors.

2 Wire the backbone in a star

topology for proper fault isolation.

Make sure to lay extra fiber cables. The extra cost is small and you need them as your network grows.

The star topology conforms to Ethernet and FDDI wiring. Ensure that you run at least two FDDI fiber strands to each backbone connection.

Understanding General Network Configuration Rules 2-3

Table 2-1 Seven Basic Network Rules (continued)

Rule Definition Recommendations/Notes 3 The maximum fiber Ethernet

network diameter is 4200 meters of fiber cable.

4 Certain LAN devices on the

network shrink the maximum Fiber Ethernet network diameter to less than 4200 meters.

5 Assume that 1 meter of

coaxial or twisted pair cable is equal to 1 meter of fiber cable.

6 The fiber link distances must

not exceed the limits imposed by the optical power budget.

7 When in doubt, use a switch

or bridge.

4200 meters is the maximum distance between any two transceivers on the network.

4200 meters does not include the transceiver cable (that is, drop or patch cable) that connects a device with an external transceiver. Transceiver cables can extend up to 50 meters. Thus, total network diameter can be as much as 4300 meters (4200 m + 2 * 50 m) between any two nodes.

Many LAN products delay the signal that travels through them. This is known as equivalent distance. Each microsecond delay:

Reduces the maximum link distance Shrinks the network diameter by

approximately 200 meters of fiber cable

Table 2-2

3Com products. A conservative rule. For example, the

actual equivalence is about 1.1 meters of coaxial for each meter of fiber. For simplicity, assume 1 meter.

For 62.5 micron cable, you can utilize up to 4000 meters point-to-point using the CoreBuilder 5000 or ONline fiber modules. If you have poor quality cable or cross several patch panels, you may have to sacrifice some distance in cable length.

Some older Ethernet fiber optic products are less powerful than CoreBuilder 5000 fiber module optics. If connecting to an Ethernet fiber optic product, remember that the least powerful device determines the maximum point-to-point distance.

If you are not certain if you have exceeded allowable network distances, use a bridge to extend the network.

lists Equivalent Distances for

2-4 DESIGNING AND EXPANDING THE NETWORK

LAN Product

Distances

When you configure your network, each product requires a different LAN equivalent distance. LAN equivalence is the sum of the incoming and outgoing module port signals. 3Com product modules have different LAN equivalent distances. Ta b le 2 -2

lists the LAN product

equivalent distances required for each LAN product.

Table 2-2 LAN Product Equivalent Distances

Equivalent

LAN Product

CoreBuilder 5000 and ONline Ethernet 10BASE-T Modules 585

Incoming signal to TP port 420 Outgoing signal from TP port 165

CoreBuilder 5000 and ONline Ethernet 10BASE-FB Modules 190

Incoming signal to fiber port 140 Outgoing signal from fiber port 50

ONline Ethernet FOIRL Module 560

Incoming signal to fiber port 330

Outgoing signal from fiber port 230 ONline Ethernet Transceiver Module 0 ORnet Star Coupler (8 or 14 port) 180 ONline Ethernet BNC Module 900

Incoming signal to BNC port 450

Outgoing signal from BNC port 450 ONline Ethernet Repeater Module 800

Incoming signal to AUI port 600

Outgoing signal from AUI port 200 IEEE Repeater 800

Distance (meters)

Configuring Fiber Backbone, Twisted Pair to-the-Desk 2-5

Configuring Fiber Backbone, Twisted Pair to-the-Desk

Fiber Backbone

Configuration Rules

This section describes:

■ Fiber Backbone Configuration Rules

■ Fiber Backbone Configuration Verification

When you configure a network with unshielded twisted pair cabling to the desk and fiber for the backbone, the following rules apply:

■ Add a bridge if you will exceed 4 full repeater hops.

■ If traffic travels into a port on any repeater-based module and out

the backplane, then the module counts as a ½-repeater hop.

■ If traffic travels into the module through one port and out another

port on the same or a different module, then the module counts as 1 full repeater hop.

■ The equivalent fiber distance for the 3Com Ethernet 10BASE-FB

Modules (see Table 2-1

■ 140 meters for signals that enter a 10BASE-FB module port at the

, Rule 4) is:

front panel.

■ 50 meters for signals that internally enter a 10BASE-FB module

through the CoreBuilder 5000 hub backplane.

■ The equivalent fiber distance for the 20/40-Port modules

(see Table 2-1

■ 420 meters for signals that enter the 20/40-Port module port at the

, Rule 4) is:

front panel.

■ 165 meters for signals that internally enter a 20/40-Port module

through the CoreBuilder 5000 hub backplane.

For each pair of 20/40-Port modules that a signal travels through, deduct a fiber equivalent distance of 585 meters (420 m + 165 m = 585 m) from the overall allowable network diameter. You must also deduct fiber equivalent distance if a signal enters the 20/40-Port module through one port and exits another port of the same 20/40-Port module. The fiber equivalent distance counts as 585 meters of fiber equivalent distance, and as a full repeater hop.

2-6 DESIGNING AND EXPANDING THE NETWORK

Configuration

Example of Fiber

Backbone, Twisted

Pair to-the-Desk

Fiber backbone

1000 m

The sample configuration shown in Figure 2-1

illustrates how to

determine if the transceivers are within legal Ethernet distance limits.

The 24-gauge unshielded twisted pair cable is used to connect 10BASE-T Transceivers to the 20/40-Port modules in the hubs.

500 m

Fiber backbone

Hub A

Hub B

Hub C

Unshielded twisted pair

100 m

75 m

Unshielded twisted pair

Configuration Distance

1. Maximum Diameter:

2. Equivalent Distances: Hub A:

Hub B: Hub C:

Total:

3. Amount of cable between

transceivers:

Total:

4. Remaining Distance:

470 m 305 m 190 m

965 m

1000 m 100 m 500 m 75 m

4200 m

1675 m

1560 m

Fiber Backbone

Configuration

Verification

Figure 2-1 Sample Configuration Distance Calculation

To determine if your network configuration is legal:

1 Identify the two transceivers that are the greatest fiber equivalent

distance apart. In Figure 2-1

, 10BASE-T transceivers A and B are the

farthest apart.

2 Set aside 4.2 km (4200 m) because this is the maximum network

diameter for a pure fiber network (Table 2-1

, Rule 3).

Configuring Twisted Pair Backbone, Twisted Pair to-the-Desk 2-7

3 Determine the sum of each hub’s equivalent distance based on the

figures in Table 2-2

. For example, Hub A has an equivalent distance of 470 m. This total represents the sum of the incoming signal to the UTP port (420 m) and the outgoing signal from the fiber port (50 m). Refer to Figure 2-1

for details.

4 Subtract the total equivalent distance of each hub located between

transceivers A and B [inclusive (965 m)] from the maximum network diameter (4200 m). In this case, the subtotal is 3235 m.

5 Determine the total amount of cable between transceivers A and B

(1675 m) and subtract this number from the subtotal determined in step 4 (3235 m).

The remaining distance for legal expansion equals 1560 m.

Configuring Twisted Pair Backbone, Twisted Pair to-the-Desk

Twisted Pair

Backbone

Configuration Rules

For the configuration shown in Figure 2-1

to function properly, the fiber equivalent distance between Transceiver A and Transceiver B must be less than 4200 meters. As a result of the calculation above, 1560 meters remain for expansion.

This section describes:

■ Twisted Pair Backbone Configuration Rules

■ Configuration Example of Twisted Pair Backbone, Twisted

Pair-to-the-Desk

When you configure a network with unshielded twisted pair cabling to the desk and twisted pair for the backbone, the following rules apply:

■ Add a bridge if more than eight 20/40-Port modules are serially

connected. Each bridge creates a subnetwork. Each subnetwork can have its own 4200 meter network diameter.

■ No more than eight 20/40-Port modules can be in the path between

any two transceivers due to Ethernet's four-repeater rule.

■ If traffic travels into a port on any repeater-based module and

out the backplane, the module counts as a ½-repeater hop.

■ If traffic travels into the module through one port and out

another port on the same or a different module, the module counts as 1 full repeater hop.

2-8 DESIGNING AND EXPANDING THE NETWORK

Configuration

Example of Twisted

Pair Backbone,

Twisted

Pair-to-the-Desk

Figure 2-2 illustrates an unshielded twisted pair network using

24-gauge cable.

100 m

Figure 2-2 Unshielded Twisted Pair Network

100 m

50 m

Although there is no fiber in the configuration illustrated in Figure 2-2, you can calculate the fiber equivalent distance as follows:

1 Total amount of cable between workstations:

100 m + 100 m + 100 m + 100 m + 50 m = 450 m.

2 Total equivalent distance of the 20/40-Port modules:

Each hub has an equivalent distance of (420 m + 165 m) or 585 m Four hubs with a total equivalent distance of (585 m * 4) or 2340 m exist.

3 Total equivalent distance: 450 m + 2340 m = 2790 m.

Incoming signal to the UTP port on each hub = 420 m. Outgoing signal from the UTP port on each hub = 165 m. Refer to Table 2-2 more information on LAN product equivalent distances.

Although the unshielded twisted pair network example in Figure 2-2 only uses 20/40-Port modules, it is also possible to use other 10BASE-T modules.

for

Using Patch Panels 2-9

Because the total equivalent distance (2790 m) is less than 4200 meters, Figure 2-2

illustrates a legitimate configuration.

Using Patch Panels Patch panels make cable management easier when used in a

rack-installed hub. However, patch panels weaken signals that pass through them, thereby reducing achievable link distances. 3Com assumes the use of one patch panel in the 100 meter link distance calculations specified in this guide. Each additional patch panel in the link reduces the 100 meter link distance by approximately 10 meters.

Using Module Workgroups

In the example shown in Figure 2-2

, if you use two patch panels between the top right PC and the top right hub, you must shorten the link distance of 100 meters to 90 meters. This is because the maximum allowable link distance on 24-gauge wire (using 10BASE-T signaling with two intervening patch panels) is 100 meters minus approximately 10 meters.

A patch panel installed between the bottom right PC and the bottom left hub does not affect the link because it is only 50 meters away. Patch panels only affect lengths greater than 90 meters.

When you set up a 20/40-Port module as a fully configured workgroup module, you are configuring a logical network that supports up to eight workgroups (isolated networks) per module. Because a managed CoreBuilder 5000 hub may contain as many as 16 CoreBuilder 5000 20-Port modules or eight CoreBuilder 5000 40-Port modules, it is possible to configure your hub with a maximum of 128 workgroups.

This section describes:

■ Workgroup Definition

■ Dividing the Network into Workgroups

Workgroup

Definition

Workgroups are individual groups set up to divide your network layout into smaller isolated networks.

2-10 DESIGNING AND EXPANDING THE NETWORK

Workgroups:

■ Enable administrators to have more flexibility in organizing their

network.

■ Decrease the amount of traffic on the backplane segments of the

hubs in which the workgroups reside.

By creating module workgroup networks instead of separate backplane segment networks, you can configure a maximum of 128 workgroups per hub using little or no backplane traffic.

Although the CoreBuilder 5000 Ethernet 20/40-Port 10BASE-T Module has access to eight backplane and eight isolated segments, the module only supports per-port switching to eight segments simultaneously.

Dividing the Network

into Workgroups

The following example shows how workgroups help administrators to efficiently organize users in their network.

Workgroup Example

Network administrator Jane Smith plans to reorganize the development and support organizations in her company by dividing each department within those organizations into separate workgroups. Currently, each organization is connected to separate backplane segments (Figure 2-3

Backplane Segment 6 Backplane Segment 5 Backplane Segment 4

Hub C

Engineering

Technical Support

Development Organization

Marketing

Technical Publications

Support Organization

Figure 2-3 Typical Corporate Organizational Structure

Using Module Workgroups 2-11

To divide the sample network into workgroups, Smith works as follows:

1 After studying each department’s needs, Smith decides to:

■ Create separate workgroups for each department within the two

organizations

■ Connect the workgroups to each other through an internal

bridge

Table 2-3

describes the reorganization of each department.

Table 2-3 Sample Network Reorganization

Module

Ethernet

Department

Engineering Department

Technical Support

Marketing 20-Port 1 WG4 2 to 20 Technical

Publications

2 As Ta b le 2 - 3

Module Type

20-Port 3 WG2 1 to 9

20-Port 6 WG3 1 to 18

20-Port 8 WG1 1 to 7

indicates, Smith assigns four organizations within her

Slot step next

Workgroup step next

company into separate workgroup numbers (WG1 to WG4). The workgroups can share resources and communicate with each other without using the hub backplane. Figure 2-4

illustrates each workgroup

configuration.

Ports Used

2-12 DESIGNING AND EXPANDING THE NETWORK

Hub C

Slot 4

1 2 3 4 5

WG2

6 7 8 9

WG4

KEY

WG = Module Workgroup Network (where x is the workgroup number) BR = Internal Bridge

= Port allocated to internal bridge

11 12 13 14 15 16 17 18 19 20

Slot 1

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18 19 20

Slot 3 Slot 6

WG3

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18 19 20

WG1

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18 19 20

Slot 8

= Workgroup

Figure 2-4 20-Port Module Workgroup Port Allocation

To enable all of the workgroups to communicate with other networks, administrator Smith must connect at least one port per workgroup to the bridge (see Figure 2-4

Setting Redundant Links 2-13

By dividing the network into workgroups, Smith:

■ Increases the available number of backplane resources

■ Decreases overall backplane traffic

Setting Redundant Links

3 In Figure 2-4

, Smith configures four separate workgroups (WG1 to WG4) and connects the workgroups to each other using an internal bridge module (such as the CoreBuilder 5000 Multiprotocol Switching Module).

The advantages of the configuration in Figure 2-4

■ Networks configured as module workgroups provide greater

include:

network capacity (8 backplane networks and 128 module workgroup networks)

■ Network configuration is more flexible because workgroups can

communicate with other networks

■ Less backplane traffic because communication between each

department is isolated from the hub backplane

If Smith configured each workgroup on separate backplane segment networks instead of separate module workgroup networks, 6 of the hub’s 8 backplane segments would have been isolated from the rest of the network.

When you set up a redundant twisted pair link between ports on CoreBuilder 5000 hubs, you prevent a network failure. Figure 2-5 shows two examples of a redundant configuration.

It is also possible to enable redundancy between ONline modules in a CoreBuilder 5000 hub.

2-14 DESIGNING AND EXPANDING THE NETWORK

CoreBuilder 5000 hub

40-Port

module

Redundancy set up between two ports on the same module

Figure 2-5 Redundant Twisted Pair Configuration

RJ-45

Twisted pair cable

CoreBuilder 5000 hub

20-Port

module

Redundancy set up between two ports on different modules

Setting Redundancy Between Two Ports on One 40-Port Module

To set link redundancy between two ports on one 40-Port module:

1 To connect two links to two ports on the module using the SET PORT

{slot.port} MODE REDUNDANT {slot.port} network management command.

2 Specify the primary link port and the backup link port.

For example, if you set up a redundant link using the following command:

SET PORT 8.5 MODE REDUNDANT 8.7 Port 5 in slot 8 becomes the primary link and port 7 in slot 8 becomes

the backup link.

Setting Redundant Links 2-15

Setting Redundancy Between Ports On Two 20/40-Port Modules

To set link redundancy between one 20-Port and one 40-Port module:

1 To connect two links to two ports between the modules using the SET

PORT {slot.port} MODE REDUNDANT {slot.port} network management command.

2 Specify the primary link port and the backup link port.

For example, if you set up a redundant link using the following command:

SET PORT 12.4 MODE REDUNDANT 8.9 Port 4 in slot 12 becomes the primary link and port 9 in slot 8 becomes

the backup link.

CAUTION: Setting redundancy on the 20/40-Port module is a management module software function. Consequently, a network loop could occur if the module is set to redundant mode and it is powered off and then on without a 3Com distributed management module in the hub.

Once you configure redundancy:

1 A switchover to the backup link occurs under two conditions:

■ Link failure

■ Port partition

2 Once the switchover occurs and the backup link becomes operational,

the system performs a switchover back to the primary link automatically once the problem is resolved.

Although you can configure redundancy between two ports on a single module, you should configure redundancy between two ports on two different modules. This provides additional protection if, for example, one of the modules becomes inoperative.

Refer to the CoreBuilder 5000 Distributed Management Module User Guide for more information on setting redundancy between

20/40-Port module ports.

2-16 DESIGNING AND EXPANDING THE NETWORK

Where to Go From Here

Once you complete this chapter, go to Chapter 3. Chapter 3, Installing and Operating the Module, describes installation procedures and explains how to set the DIP switches, configure the module through network management, and monitor the front panel using the LEDs.

INSTALLING AND OPERATING THE

MODULE

This chapter describes the installation of the CoreBuilder 5000 Ethernet 20/40-Port 10BASE-T Module.

A module reference card for the 20-Port module (Document Number 17-00542) or a 40-Port module (Document Number 17-00523) lists the DIP switch settings, 20/40-Port module management commands, LED indicators, and other module information. Store the card in the CoreBuilder 5000 reference binder in the Reference Card area.

This chapter contains the following topics:

■ Precautionary Procedures

■ Unpacking Procedures

■ Quick Installation

■ Setting DIP Switches

■ Installing the Module

■ Configuring the Module

■ Showing Module Configurations

■ Attaching the Network Monitor Card

■ Gathering Statistics

■ Monitoring the Front Panel

■ Verifying LEDs and the Network

Read the precautionary procedures before unpacking the module.

3-2 INSTALLING AND OPERATING THE MODULE

Precautionary Procedures

Unpacking Procedures

Electrostatic discharge (ESD) can damage static-sensitive devices on circuit boards. Follow these precautions when you handle the 20/40-Port module.

CAUTION: Do not remove the board from its antistatic shielding bag until you are ready to inspect or install it.

CAUTION: Handle the board by the faceplate only.

Use one of the following proper grounding techniques when you install the 20/40-Port module:

■ Use a foot strap and grounded mat or wear a grounded static

discharge wrist strap

■ Touch the grounded rack or other source of ground just before you

handle the module

To unpack the 20/40-Port module:

1 Verify that the 20-Port module (Model Number 6120M-TPP) is the

model you ordered by checking the Model Number listed on the side of the shipping carton. Repeat this step for the 40-Port module (Model Number 6140M-TPP).

Note that the product model number printed on the shipping box differs from the model number on the product. The model number on the shipping box contains the prefix ’3C9’.

2 Remove the 20/40-Port module, in its antistatic bag, from the shipping

carton.

3 Remove the module from the antistatic shielding bag and inspect it for

damage. Always handle the 20/40-Port module by the faceplate, being careful

not to touch the components. If the module appears to be damaged, return it to the antistatic shielding bag, repack it in the shipping carton, and contact your local supplier.

Keep the shipping carton and antistatic shielding bag in which your module was shipped for future storage or shipment.

Quick Installation 3-3

Record the serial number of your 20/40-Port module. The Hub Planning Chart, located in the CoreBuilder 5000 reference binder, and the module Planning Chart supplied with your module, are provided for this purpose.

Quick Installation Table 3-1 outlines the steps for the installation of your module. If you

are familiar with installing CoreBuilder 5000 modules, use this table as a checklist. Otherwise, consult the remainder of this chapter.

Table 3-1 Quick Installation Checklist

Step Procedure Chapter/Section 1 Verify that your network complies with the

basic rules for network design.

2 Unpack the module. Chapter 3, Unpacking

3 Configure the DIP switch settings. If you

have a network management module installed in the hub, configure the module using the management commands described later in this chapter.

4 Enter the SHOW POWER1 command at the

5 Insert a 20-Port module into one open slot

6 Establish connections from the 20/40-Port

7 Verify LED status for normal operation. Chapter 3, Verifying LEDs

Refer to the CoreBuilder 5000 Integrated System Hub Installation and Operation Guide for

command line of the terminal. This command displays current power requirements for the hub.

or insert a 40-Port module into two adjacent slots in the hub. Fasten the ejectors and tighten the faceplate screws.

module to devices using the appropriate connectors and cabling.

details on hub power requirements.

Chapter 2, Designing and

Expanding the Network

Procedures

Chapter 3, Setting DIP

Switches or Configuring the Module

Chapter 3, Installing the

Module

Chapter 3, Installing the

Module

Chapter 3, Installing the

Module

and the Network

For information about potential problems, consult the troubleshooting techniques in Chapter 4

3-4 INSTALLING AND OPERATING THE MODULE

Setting DIP Switches

If you are using a management module and do not plan to use the DIP configuration command, skip this section and proceed to Installing the

Module on page 3-7.

The CoreBuilder 5000 Ethernet 20/40-Port 10BASE-T Module has an 8-position DIP switch.

Using DIP Switches Use the DIP switch to:

■ Select a network for all ports on the 20-Port module or 40-Port

module

■ Configure all 20 or 40 ports of the module into one workgroup or

module segment

■ Choose the primary module configuration:

■ Non-volatile RAM configuration (software configuration)

■ DIP segment selection (DIP-specified module configuration)

You cannot assign ports to different networks using the DIP switches on the 20/40-Port module. You must use network management commands.

Use network management commands, rather than the DIP switches, to configure the module. All of the DIP switch settings on the 20/40-Port module are ignored if an appropriate CoreBuilder 5000 Distributed Management Module (DMM Version v2.0 or later, for example) is already installed in the hub.

Setting the DIP

Switches

To set the module to access the DIP switch settings when using a management module, issue the SET DEVI CE DIP_CONFIGURATION command from the management module.

If you do not have a CoreBuilder 5000 Distributed Management Module installed in your hub, your hub configuration defaults to the DIP switch settings on the module.

Setting DIP Switches 3-5

Figure 3-1 shows the DIP switch locations on the module.

12345678

DIP switches

Off

12345678

0 1

Setting s

CH SEL 0

CH SEL 1

CH SEL 2

ISOLATE

NVRAM

NOT USED

Backplane DIN connector

Figure 3-1 20/40-Port Module and DIP Switch Location

DIP Switch Definition Table 3-2 briefly describes the DIP switch settings. Each DIP switch

function is defined in Configuring the Module

Table 3-2

■ Switches 1 through 4 enable you to configure all ports for one of

lists DIP Switches 1 through 4.

on page 3-10.

the backplane segments (Ethernet 1 to Ethernet 8) or as a workgroup (Isolate_1).

■ DIP Switch 5 enables you to switch between Non-volatile RAM

(NVRAM) or DIP-switch controlled configuration.

■ Switches 6, 7, and 8 are not used.

3-6 INSTALLING AND OPERATING THE MODULE

Table 3-2 Channel Select DIP Switch Settings

Network Selection

1 (default) Off Off Off Off 2 Off Off Off On 3 Off Off On Off 4 Off Off On On 5 Off On Off Off 6 Off On Off On 7 Off On On Off 8 Off On On On Isolate_1 On x x x

By default, Switch 5 is set to NVRAM. When enabled, settings stored in NVRAM take

precedence over DIP Switch settings 4 through 1.

The DIP switch legend on the module refers to the backplane connection as the channel selection (CH SEL). The channel setting and the network setting are the same. Ports set to the same network communicate with each other. If the switch labeled ISOLATE is ON, it sets the module to Isolated_1.

Switch Settings

Switch 4 Switch 3 Switch 2 Switch 1

When the 20/40-Port module is first installed, the hub checks for configuration settings in the DMM.

If:

The hub is unmanaged, then the 20/40-Port module checks for configuration settings stored in NVRAM

There are no configuration settings in NVRAM or DIP Switch 5 is set to DIP-switch controlled configuration, the 20/40-Port module checks the DIP switches for configuration information

Installing the Module 3-7

Installing the Module

You do not need to power off the CoreBuilder 5000 hub to install or remove the 20/40-Port module. You can insert the module while the hub is operating (this is called a hot swap).

To install the 20/40-Port module:

1 Use one of the following proper grounding techniques when you install

the 20/40-Port module:

■ Properly ground yourself prior to handling the 20/40-Port

module.

■ Attach a static wrist guard to yourself or touch a grounded static

mat prior to handling the 20/40-Port module.

2 Configure the 20/40-Port module:

■ If you plan to install the 20/40-Port module in a managed hub

(for example, DMM Version v2.0 or later), go to step 3 to complete the installation. To configure the appropriate settings, go to Configuring the Module

■ If you plan to insert the 20/40-Port module in an unmanaged

on page 3-10.

hub, configure the DIP switch settings on the module to the desired settings (see Setting DIP Switches

on page 3-4 and go to

step 4.

3 To determine if the hub has enough power for the new module, from

the DMM command line, enter the SHOW POWER BUDGET command. Refer to Appendix A, Electrical Specifications

, for detail on power

requirements for each of the specified watts ranges. Refer to the Distributed Management Module Commands Guide for

information on the SHOW POWER BUDGET command.

4 Locate an open slot in the hub. You need:

■ One slot for the 20-Port module

■ Two slots for the 40-Port module

Remove the appropriate number of blank panels on the hub to expose a slot for the module.

5 Insert the module into the board guides at the top and bottom of the

slot and slide it into the hub by pressing firmly at the top and bottom of the faceplate. Figure 3-2

shows the installation of the module.

3-8 INSTALLING AND OPERATING THE MODULE

Figure 3-2 Installing a CoreBuilder 5000 Module

Installing the Module 3-9

6 Close the 20/40-Port module ejectors (Figure 3-3).

Open ed

Figure 3-3 Opened and Closed Module Ejectors

Clos ed

7 Fasten the spring-loaded screws on the front of the 20/40-Port module

faceplate to the hub using your fingers (do not overtighten).

8 Attach a twisted pair cable to the RJ-45 connectors on the front of the

module (Figure 3-4

3-10 INSTALLING AND OPERATING THE MODULE

CoreBuilder 5000 hub

TRAFFIC STA

MOD STA

10X

11X

12X

13X

14X

15X

18X

19X

20X

16X

17X

10X

11X

12X

13X

14X

15X

16X

17X

18X

19X

10BASE-T E20PS-TP

RJ-45 connector

20X

10X

11X

12X

13X

14X

15X

16X

17X

18X

19X

20X

Configuring the Module

Figure 3-4 20-Port Module Cable Connection

This section describes how to configure the module using network management commands.

The CoreBuilder 5000 Distributed Management Module (DMM) provides network management for the CoreBuilder 5000 hub and its modules. Use network management commands, rather than the DIP switches, to configure the module. All of the DIP switch settings on the 20/40-Port module are ignored if an appropriate CoreBuilder 5000 Distributed Management Module (DMM Version v2.0 or later) is already installed in the hub.

Configuring the Module 3-11

Do not manage (get statistics or configure) this module from a slave management module.

If network management is present when you first install the module, the network defaults to isolated mode and the ports are automatically disabled (so that users cannot join the network undetected by network management). Therefore, you must enable the ports you wish to use and set the module ports to the appropriate network using management commands.

Use network management commands to configure the following 20/40-Port module features:

■ Enable/Disable/ Shutdown Ports

■ Set Port Redundancy

■ Set Remote Diagnostics

■ Enable/Disable Link Integrity

■ Set Alert Filter

Enable/Disable/

Shutdown Ports

■ Set Auto Polarity

■ Set Port Squelch

■ Network Selection

For additional information on network management commands refer to the CoreBuilder 5000 Distributed Management Module Commands

Guide.

This command allows you to enable, disable, and shutdown each port on the 20/40-Port module.

When a port is set to:

■ Enable – It transmits to and receives data from the network to

which the port is assigned.

■ Disable – It does not transmit or receive data. (Link Integrity is

unaffected.)

■ Shutdown – It turns off link integrity and the transmitter. The port

responds with status OFF at the terminal.

3-12 INSTALLING AND OPERATING THE MODULE

Use the following command to enable, disable, or shutdown a port:

SET PORT {

slot .por t

{

slot

} MODE {disa ble}

.all} {enab le}

{shutdown}

Set Port Redundancy This command allows you to set redundancy between ports. When

you set two ports redundant to each other, the secondary port takes over if the primary port fails.

Use the following command to set redundancy between ports:

SET PORT {

slot.port

} MODE {redundant} {

{non -red un dant }

slot.p or t

}

Refer to the section in Chapter 2, Setting Redundant Links, for an example of port redundancy.

Set Remote

Diagnostics

On the 20/40-Port module, a port you configure for Remote Diagnostics will only transmit Link Integrity if it receives Link Integrity. This allows the 20/40-Port module’s Remote Diagnostic feature to be used in a redundant configuration to provide even more fault tolerance (Figure 3-5

ONline or CoreBuilder 5000 hub

Primary

port

Backup

port

transmit

receive

transmit

receive

CoreBuilder 5000 hub

receive

transmit

receive

transmit

Diagnostic

20/40-Port

Remote

Diagnostic 20/40-Port

Figure 3-5 Remote Diagnostics Example

For example, if the primary port’s transmit link fails, the remote diagnostic port on the 20/40-Port module will stop transmitting Link Integrity. The primary port will then sense the link failure and switch over to the backup port.

Configuring the Module 3-13

Use the following command to set remote diagnostics:

Enable/Disable Link

Integrity

SET PORT {

slot.port

} MODE {REMOTE_DIAGNOSTICS} {

{NON _REM OT E_DI AGN OSTI CS }

slot.port

}

The last variable, slot.port, in the command above is optional. When Remote Diagnostic mode is enabled, it is referred to as a buddy port.

This command allows you to enable or disable Link Integrity for all ports on the 20/40-Port module in networks that comply with the 10BASE-T standard.

You should:

■ Disable Link Integrity only when connecting to older equipment

that does not comply with the 10BASE-T standard.

■ Enable Link Integrity for all ports on your 10BASE-T module. You

must enable link integrity at one end of the connection.

Use the following command to enable or disable link integrity for each port on the module:

SET PORT {

slot.port

{

slot.

all} {disabl e}

} LINK_INTE GRIT Y {enable }

Set Alert Filter This command allows you to override the PORT FILTER feature on a

port-by-port basis. The Port Filter feature enables or disables the DMM delivery of port up and port down traps. You can use this command to continue to monitor port status on crucial ports (file servers, for example), while alerts from other ports are disabled.

Configure Set Alert Filter to:

■ Enable – To use the Port Alert filtering feature.

■ Disable – To cause all port up and port down alerts to display.

Use the following command to enable or disable the port up and port down alerts for a port:

SET PORT {

slot .por t

{

slot.

all} {ena ble}

} ALERT_FI LT ER {disa ble}

3-14 INSTALLING AND OPERATING THE MODULE

The following output is an example of the SET PORT ALERT_FILTER command issued for port 1 of a module in slot 1:

CB5000> set port 1.1 a lert_filter disable [ ENTER] Port 01 .01 Alert Filter set to DISABLE.

The SET ALERT PORT_UP_DOWN FILTER command should be set before you use SET ALERT FILTER command.

For more information on this command, refer to the Distributed Management Module Commands Guide.

Set Auto Polarity This command enables the 20/40-Port module to automatically switch

the polarity of twisted pair cabling. If, for instance, you erroneously reverse the polarity of some twisted pair cabling while assembling it, Auto Polarity enables you to automatically detect this problem and reverse the polarity.

Use the following command to enable Auto Polarity for a port:

SET PORT {

slot.port

{

slot.

all} {enable}

} AUTO_POLARITY {disable}

Set Port Squelch This command allows you to establish the squelch level as either

normal (high) or low (sensitive) for ports on Ethernet 10BASE-T modules. The squelch level is factory set to ''normal'' to conform to the 10BASE-T standard.

There are two Squelch settings:

■ Low setting – Allows ports to receive weaker signals, allowing

longer distances. Increases the achievable link distance (with the added risk of losing packets to impulse noise).

■ Normal setting – Allows ports to receive signals compliant with the

10BASE-T standard.

Use the following command to set Squelch Mode for a port:

SET PORT {

slot.port

{

slot.

all} {low}

} SQUELCH {normal}

Configuring the Module 3-15

Network Selection This command provides port-level configuration flexibility using the

CoreBuilder 5000 hub's unique architecture. You can assign ports collectively or individually, to any of 8 backplane segments or any of the 8 isolated segments. Supports up to 8 segments simultaneously, in any combination. Refer to the CoreBuilder 5000 Integrated System Hub Installation and Operation Guide, Chapter 1, for a complete discussion of the CoreBuilder 5000 hub architecture.

The DIP switch settings on the module refer to the backplane connection as the “channel” selection (CH SEL). The channel setting and the network setting are the same.

Assigning Ports On the Module to a Network

Use the DIP switch settings on the 20/40-Port module to assign all ports (collectively) on the module to network 1 through 8 or to an extended segment. Network management, however, lets you assign one or more ports to a network.

Use the following command to assign a port to a network:

SET PORT {

slot.port

{

slot.

all} {isolated_1..._8}

} NETWORK {ethernet_1..._8}

Use this command to assign users to backplane segments or isolated segments (workgroups). For instance, to create a module segment workgroup, you must assign all of the users in the workgroup to one isolated network (for example, ISOLATED_1).

For more information on workgroups, refer to the section in Chapter 2, ''Module Workgroups''.

Assigning a Monitor Card to a Network

If you have a CoreBuilder 5000 Ethernet Network Monitor Card or Private Line Card installed on this module, network management also enables you to assign the monitor card to a network. The CoreBuilder 5000 20/40-Port Module supports up to 2 daughter cards. You can assign the daughter cards to any of the 8 backplane segments, whether or not any of the ports are assigned to that segment. You can also assign daughter cards to an isolated segment.

3-16 INSTALLING AND OPERATING THE MODULE

Use the following command to assign a monitor card to a network:

Showing Module Configurations

Show Module

Command

SET MODULE {

slot.subslot

} NETW ORK {ethe rn et_1. .. _8}

{isola te d_1. .. _8}

The CoreBuilder 5000 Ethernet Network Monitor Card is configured as subslot 2 or 3 on the 20/40-Port module. The default, subslot 1, refers to the 20/40-Port module.

You cannot attach an Ethernet Private Line Card to an isolated network.

You can display status information about the 20/40-Port module using the following network management commands:

■ SHOW MODULE

■ SHOW MODULE VERBOSE

■ SHOW PORT

■ SHOW PORT VERBOSE

This command enables you to display both brief and verbose information about a particular module.

Use the following command to display module information:

SHOW MODULE {

slot.subslot

{

slot.

all} {no_ve rb ose}

} {ve rbos e}

The following output is an example of the SHOW MODULE VERBOSE command issued for a 20-Port module installed in slot 10:

CB5000> sho w module 10 .1 verbos e [ENTER]

Slot Module Version N etwork G eneral Inf ormation

----- - --------- - ------- -- --------- ----- --------- --------

10.01 6 120M-TPP 1.00 PER_PO RT

6120M- TPP: CB500 0 Ethernet 2 0-Port 10 BASE-T Modul e

Boot Ve rsion: 1.00 Non-Volatil e DIP Sett ing: EN ABLED

Showing Module Configurations 3-17

Show Port Command This command enables users to display brief and verbose information

on both individual ports and all ports collectively.

Use the following syntax to display port information:

SHOW PORT {

slot.port

{

slot.

all} {no_v erbos e}

} {ve rbos e}

The following output is an example of the SHOW PORT ALL VERBOSE command issued for a 20-Port module installed in slot 4 (only the output for ports 1, 2, and 3 are shown):

CB5000> sho w port 4.al l verbose [ENTER]

Port Di splay for Module 6120M -TPP :

Port Mode Status Network General Information

----- ----- ------- ------- -------------------

04.01 E NABLED OK AY ETHERNET_2

Port Al ert Filter : ENABLED Port Co nnector: RJ-45 Networ k Dip Setti ng: ETHERNE T_1 Link In tegrity: ENABLED Auto Po larity: ENABLED

04.02 E NABLED OK AY ET HERNET_2

Port Al ert Filter : ENABLED Port Co nnector: RJ-45 Networ k Dip Setti ng: ETHERNE T_1 Link In tegrity: ENABLED Auto Po larity: DISABLE D

04.03 E NABLED OK AY ET HERNET_5

Port Al ert Filter : ENABLED Port Co nnector: RJ-45 Networ k Dip Setti ng: ETHERNE T_1 Link In tegrity: ENABLED Auto Po larity: ENABLED

3-18 INSTALLING AND OPERATING THE MODULE

Attaching the Network Monitor Card

To monitor Ethernet and RMON statistics on your 20/40-Port module, you must attach the CoreBuilder 5000 Ethernet Network Monitor Card (ENMC) to the network you wish to monitor. The ENMC enables you to individually select and monitor each backplane segment of your CoreBuilder 5000 hub.

Figure 3-6

provides a component side view of the 20/40-Port module with the network monitor card orientation on the module. For details on the installation, refer to the documentation that accompanies the CoreBuilder 5000 Ethernet Network Monitor Card.

Screws

Standoffs

Monitor card

NMC connector

Figure 3-6 Attaching the CoreBuilder 5000 Ethernet Monitor Card

Gathering Statistics 3-19

Gathering Statistics This section describes the following capabilities of the 20/40-Port

module:

■ Gathering Statistics

■ Monitoring the Network

Gathering Statistics The 20/40-Port module gathers repeater statistics without the use of a

network monitor card. These repeater statistics include:

■ Network

■ Module

■ Port

The 20/40-Port module gathers repeater statistics for each port (for example, collision, partition, late collision, data rate mismatch, and short event statistics).

Unlike repeater statistics, Ethernet and RMON statistics are only available when a Network Monitor Card is defined.

Monitoring the

Network

It is possible to install the monitor card on either the 20/40-Port module or the Distributed Management Module for Ethernet (DMM-EC). For more information on the DMM, refer to the Distributed

Management Module User Guide.

The CoreBuilder 5000 Ethernet Network Monitor Card does not provide per-port statistics for ONline modules when it is installed on the 20/40-Port module. If, however, the card is installed on the DMM, it is possible to collect per-port statistics for ONline modules.

The 20/40-Port module supports two daughter cards. You may assign these cards to any of the eight networks (isolated or non-isolated segments). The ability to support two cards provides greater flexibility in both workgroup creation and module configuration.

Once the monitor card is attached to the 20/40-Port module, you may monitor the network using the following commands:

■ Monitor

■ Show Counter

3-20 INSTALLING AND OPERATING THE MODULE

Monitor Command

This command enables you to monitor each network (individually) by specifying the backplane segment, isolated or non-isolated, to which your ports are configured.

Use the following command to monitor a network:

MONI TOR {mm:s s} { ETH ERNE T} {eth er net_1 .. ._ 8}

The system-specified range of time allotted for monitoring the network is 00 to 30 (minutes) and 05 to 59 (seconds). Use these ranges when specifying a length of time to monitor your network.

The following output is an example of the MONITOR ETHERNET command for a 20/40-Port module assigned to network Ethernet_1. This example monitors ethernet_1 every 10 seconds.

{isola ted _1 ..._ 8} {REPEA TER } {RMO N}

CB5000 > monitor 0 0:10 ethernet et hernet_1 [ENTER]

Ethernet Statistics for ETHERNET_1

----------------------------------------------------------- Cumulative Last Time Interval

----------------------------------------------------------FCS Err ors 0 0 SQE Test Errors 0 0 Alignm ent Errors 0 0 Carrie r Sense Errors 0 0 Frame Too Lo ng 0 0 Deferred Transmissions 0 0 Late Co llisions 0 0 Excess ive Collis ions 0 0 Single Coll ision Fram es 0 0 Multip le Collisi on Frames 0 0 Intern al MAC Receive Err ors 0 0 Intern al MAC Tran smit Errors 0 0

Display wil l refresh e very 10 seconds. Press C TRL-C to exit.

Gathering Statistics 3-21

Show Counter Command

This command provides you with detailed information on Ethernet and RMON statistics. The Ethernet and RMON statistics-gathering requires a network monitor card.

Use the following command to gather Ethernet and RMON statistics:

SHOW COUNTER {ETHERNET} {ethernet_1..._8}

{RMO N}

Use the following command to view statistics on an isolated network:

SHOW COUNTE R {REPEATE R} {isolated_x} {m odule}

Use the following command to show network, module, and port-level repeater statistics:

SHOW COUNTE R {RE PEAT ER} {e ther net_ 1... _8}

{isola ted_ 1... _8} SHOW COUNTE R {RE PEAT ER} { SHOW COUNTE R {RE PEAT ER} {

module port

}{

slot slot .port

}

Both the Monitor and Show Counter commands provide information for ongoing network statistics. The Monitor command displays network statistics periodically at the time interval you specify in the command. The Show Counter command enables you to display all statistics, at one time, since the last clear counter command.

The following example illustrates RMON statistics:

CB5000 > show coun ter rmon hos ts ethern et_1 [ENTER]

RMON Ho sts Table for Host Addr ess 08-00 -19-A4-B3 on Port 5.12

------ --------- -------- -------------------- -------- --------- Receiv ed Packets 24000 Receiv ed Octets 285000 Transm itted Pack ets 1200 Transmitted Octets 75000 Transmitted Errors 124 Transmitted Broadcas t Packets 150 Transmitted Multicas t Packets 280

3-22 INSTALLING AND OPERATING THE MODULE

For more information on Ethernet, RMON, and repeater statistics, refer to the CoreBuilder 5000 Distributed Management Module Commands Guide.

Monitoring the Front Panel

Use the LEDs on the front panel of the 20/40-Port module to monitor the status of each port. The 20/40-Port module has one Module Status LED and 20 or 40 port activity and status LEDs.

Module Status LED A single LED located at the top left of the faceplate indicates the status

of the module (see Figure 3-7).

Port Status and

Activity LEDs

The 20/40-Port module has one bi-color LED for each port. This LED is capable of displaying the following two colors:

■ Green – Displays port status information

■ Yellow – Displays port traffic information

The LEDs are triple-stacked to maximize the capacity of port connections on the front panel.

Figure 3-7

of a port as described in Table 3-3

shows the location of the LEDs. Each LED indicates the state

Monitoring the Front Panel 3-23

TRAFFIC STATUS

MODULE

STATUS

21X

22X

23X

24X

25X

26X

27X

28X

29X

30X

10X

31X

11X

12X

32X

13X

33X

13X

34X

14X

35X

15X

16X

36X

17X

37X

38X

18X

39X

19X

40X

20X

10X

11X

12X

13X

14X

15X

16X

17X

18X

19X

20X

10BASE-T E20PS-TP

TRAFFIC STA

MOD STA

Module Status LED

10X

11X

12X

13X

14X

15X

16X

17X

18X

19X

20X

Bi-Color Port Status/Activity LEDs

Figure 3-7 20-Port and 40-Port Module Faceplate

3-24 INSTALLING AND OPERATING THE MODULE

Table 3-3 20/40-Port Module LED Interpretations

LED Name Color State Indicates

Module Status green Off No power to hub or insufficient

Port Activity/Status

(Ports 1 to 20) (Ports 21 to 40)

power in the hub to support this module.

Software download to the 20/40-Port module in progress.

Blinking One of the daughter cards failed

module diagnostics.

On Module OK.

green On Port enabled and link OK or Link

Integrity disabled. 1 blink Link failure on the port. 2 blinks Port partitioned. Off Port disabled.

yellow Off No packets are received on the ports.

On Constant traffic activity on port.

Software download to the 20/40-Port

module in progress. Blinking Normal activity on the port.

Verifying LEDs and the Network

This section describes LED and Network verification for the 20/40-Port module, including:

■ Using the CoreBuilder 5000 Controller Module to Verify Bi-Color

LED Operation

■ Using the DMM to Verify Network Connections

For more information on the DMM, refer to the Distributed Management Module User Guide.

Verifying LEDs and the Network 3-25

Using the

CoreBuilder 5000

Controller Module

to Verify Bi-Color LED

Operation

Using the DMM to

Verify Network

Connections

The 3Com CoreBuilder 5000 hub's controller module is equipped with a LED Test button on the front panel. Use this button to verify LED operation.

When you press the LED test button:

1 The module initiates a test to all modules in the hub. All LEDs should

respond by lighting continuously for approximately 5 seconds.

2 During this time period, the LEDs should alternate between green and

yellow about every ½ second. Any LED that does not light is defective. The LED test does not disrupt network operation.

During a software download to the 20/40-Port module, the Module Status LED, on the module, is off and all of the other port LEDs are illuminated solid yellow until the download process is complete.

The Distributed Management Module enables you to verify each network connection (both active and isolated) for all CoreBuilder 5000 modules and monitor cards installed in your hub.

To initiate the verification process:

1 Press the Display Control Toggle button on the front of the DMM. 2 Observe the DMM sequentially cycle through each network connection

(Ethernet 1-8 or Isolated 1-8).

3 Each status port LED associated with the network indicated on the

DMM LED matrix display illuminates.

4 If you have an Ethernet Network Monitor Card assigned to a network

on a module, the Module Status LED lights to indicate the network to which it is assigned.

The following example illustrates the verification process.

3-26 INSTALLING AND OPERATING THE MODULE

Verifying Network

Connections for

the 20/40-Port

Module

Where to Go From Here

Network Administrator Jim Johnson must verify network connections for a newly installed 20-Port module. Currently, Johnson has one 20-Port module connected to Ethernet Networks 1 and 3 (E1 and E3).

To verify this configuration:

1 Johnson presses the Display Control Toggle button located on the front

of the DMM.

2 Once initiated, the DMM cycles through each network connection (E1

and E3) and performs the following: a Displays the current network under examination (as shown on the

DMM LCD display).

b Lights the status LEDs associated with the current network.

3 Because Johnson’s 20-Port module is connected only to E1 and E3, the

network verification only lights the status LEDs associated with those networks. Conversely, if Johnson had configured the 20-Port module with connections to all eight backplane networks, the network verification process would cycle through all eight networks.

Chapter 4 provides information on troubleshooting and technical

assistance. If you have problems installing your 20/40-Port module, you should refer to Chapter 4 prior to contacting customer support.

TROUBLESHOOTING

This chapter describes troubleshooting procedures for the CoreBuilder 5000 Ethernet 20/40-Port Module. Information on troubleshooting may assist you in verifying the module operation.

This chapter is divided into the following sections:

■ Troubleshooting Using the Module Status LED

■ Troubleshooting Using the Port Status LEDs

■ Technical Assistance

■ Where to Go From Here

4-2 TROUBLESHOOTING

Troubleshooting Using the Module Status LED

In certain situations, the module status LED may not light. Table 4-1 outlines possible causes and some solutions for troubleshooting the Module Status LED.

Table 4-1 Module Status LED Troubleshooting

LED State

Off No power to hub Check the controller module power

Blinks One of the daughter cards

Possible Cause Corrective Action

LEDs.

The hub does not have enough available power for a new module installation

The 20/40-Port module is faulty

failed, did not boot up, or failed module diagnostics

Add another power supply to the hub. Use the SHOW POWER BUDGET

management command to ascertain available power in the hub. See the

CoreBuilder 5000 Distributed Management Module Commands Guide for details.

Try a different 20/40-Port module.

Replace the failed daughter card.

Troubleshooting Using the Port Status LEDs 4-3

Troubleshooting Using the Port Status LEDs

A blinking Port Status indicator signals a problem with a port or a link connected to a port. Once a port detects a problem, you can further analyze the problem by counting the number of blinks. Ta b le 4-2 outlines possible causes and some solutions for troubleshooting the Port Status LED.

Table 4-2 Port Status LED Troubleshooting

LED State Indication Possible Cause Corrective Action

1 Blink Link Failure Cables not connected Connect cables.

2 Blinks Port

Partitioned

Off Ports

Disabled

Cables broken Check cables with cable

Link Integrity mismatch Make sure that both ends of

Faulty cable Check cable with cable

Looped network Check network wiring

Ports disabled Enable ports. 20/40-Port module

not powered Broken LED. Bad 20/ 40-Port

module.

tester. Repair or replace cables.

the connection have the same Link Integrity setting.

tester. Repair or replace cable.

topology and remove any loops that have been created.

Check the controller module Power LEDs.

Press the LED test on the controller module.

Replace module.

4-4 TROUBLESHOOTING

Technical Assistance

Where to Go From Here

You can receive assistance for installing and troubleshooting the CoreBuilder 5000 Ethernet 20/40-Port 10BASE-T Module by calling either your 3Com reseller or 3Com Technical Support. Be prepared to supply a representative with the following information:

■ Description of the problem

■ Steps you have taken to try and correct the problem

■ Type and software version of the management module being used

■ Version of software installed on your CoreBuilder 5000 hub

■ Status of the front panel LEDs

■ Configuration of your concentrator (you may find it helpful to refer

to the Slot Usage Chart in Appendix B of the ONline System Concentrator Installation and Operation Guide for a record of this

information)

Refer to Appendix B

for instructions how to contact Technical Support

for your product.

If you complete this chapter and are still unable to resolve a particular problem with your CoreBuilder 5000 Ethernet 20/40-Port 10BASE-T Module, contact 3Com Customer Support and provide them with the specific nature of your problem. Refer to Appendix B

for instructions on

contacting Technical Support for your product.

Electrical Specifications

SPECIFICATIONS

This appendix lists specifications for the CoreBuilder 5000 Ethernet 20/40-Port 10BASE-T Module, including:

■ Electrical Specifications

■ Environmental Specifications

■ Mechanical Specifications

■ General Specifications

■ Twisted Pair Connectors and Cables

The information listed in this appendix applies to both the 20-Port module and the 40-Port module, except where noted.

Backplane Interface Two 96-pin edge connectors, compatible with the

3Com CoreBuilder 5000 hub

Power Requirements 20-Port:

+2 V = 0 watts +5 V = 15 watts

-5 V = 1 watt +12 V = .5 watts

-12 V = 0 watts 40-Port: +2 V = 0 watts +5 V = 25 watts

-5 V = 1 watt +12 V = .5 watts

-12 V = 0 watts

A-2 SPECIFICATIONS

Environmental Specifications

Mechanical Specifications

General Specifications

Operating Temperature 0° to 50° C (32° to 122° F) Storage Temperature -30° to 65° C (-22° to 149° F) Humidity Less than 95%, non-condensing BTU/hr 61

Dimensions 20-Port:

1.0" W x 10.275" L x 14.37" H 40-Port:

2.0" W x 10.275" L x 14.37" H

Weight 20-Port:

2.5 lbs 40-Port:

3.09 lbs

Data rate 10 Mbps (million bits per second) Data modulation Manchester Diagnostic modulation Link Integrity pulse Collision detection 100% deterministic Port partitioning After 63 consecutive collisions Maximum number of nodes 1024 Configuration rule Supports IEEE 802.3 controllers and IEEE 802.3

repeaters

Ethernet interface Twenty or forty RJ-45 connectors with crossover

(MDI-X) wiring Number of ports 20 or 40 Cabling Compatible with the 10BASE-T Standard Host interface 3Com CoreBuilder 5000 hub bus interface standard Installation attachment Two or four thumbscrews on the faceplate

Twisted Pair Connectors and Cables A-3

Twisted Pair Connectors and Cables

Twisted Pair

Connectors

Use the information in this section to ensure that the cables and connecting hardware meet requirements. There are many types of cables and connectors that you can use to link your 20/40-Port module to your network. For proper operation, use only approved cables when you install all equipment.

This section is divided into the following parts:

■ Twisted Pair Connectors

■ Twisted Pair Cables

The IEEE 802.3 10BASE-T standard for RJ-45 pinouts is described below. 10BASE-T uses 2 of the 4 pairs of wire: pins 1 & 2 and pins 3 & 6. If you do not configure the pairs this way, the connection does not work properly.

Level 3 or higher cable has the following pin pairings:

■ pins 4 and 5 are pair 1

■ pins 3 and 6 are pair 2

■ pins 1 and 2 are pair 3

■ pins 7 and 8 are pair 4

Refer to Electrical Specifications

on page A-1 for an example of the recommended TIA-568A standard pinouts for this connector and the cable.

A-4 SPECIFICATIONS

RX Pair 2

TX Pair 3

1 +

W-G G

W-O BL

connector pinouts

Pair 1

W-BL O W-BR BR

RJ-45 transceiver

Pair 4

Figure A-1 RJ-45 Connector Pinouts

Twisted Pair Cables The twisted pair cables used in your configuration must meet the

following qualifications:

■ Level 3 or higher

■ 22 or 24 gauge twisted pair cable

■ 85 to 115 ohm impedance

■ Minimum of 2 pairs

A pair is usually a solid color wire twisted with a striped wire of the same color.

Connecting Twisted Pair Cables

Connect cables first at the active hub location. Refer to the

CoreBuilder 5000 Integrated System Hub Installation and Operation Guide for more information about CoreBuilder 5000 hub connections.

TECHNICAL SUPPORT

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

Information contained in this appendix is correct at time of publication. For the very latest, access 3Com Corporation’s World Wide Web site as described below.

This appendix describes:

■ Online Technical Services

■ Support From Your Network Supplier

■ Support From 3Com Corporation

■ Returning Products for Repair

■ Accessing the 3Com MIB

Online Technical Services

■ Contacting 3Com Technical Publications

3Com offers worldwide product support 24 hours a day, 7 days a week, through the following online systems:

■ World Wide Web Site

■ 3Com Bulletin Board Service

■ 3ComFacts Automated Fax Service

■ 3ComForum on CompuServe Online Service

B-2 TECHNICAL SUPPORT

World Wide Web Site Access the latest networking information on 3Com Corporation’s World

Wide Web site by entering our URL into your Internet browser:

http ://ww w. 3Com .c om/

This service features news and information about 3Com products, customer service and support, 3Com Corporation’s latest news releases, NetAge Magazine, and more.

3Com Bulletin Board

Service

3ComBBS contains patches, software, and drivers for all 3Com products, as well as technical articles. This service is available through modem or ISDN 24 hours a day, 7 days a week.

Access by Analog Modem

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

Country Data Rate Telephone Number

Australia up to 14400 bps 61 2 9955 2073 Brazil up to 14400 bps 55 11 547 9666 France up to 14400 bps 33 1 6986 6954 Germany up to 28800 bps 4989 62732 188 Hong Kong up to 14400 bps 852 2537 5608 Italy (fee required) up to 14400 bps 39 2 27300680 Japan up to 14400 bps 81 3 3345 7266 Mexico up to 28800 bps 52 5 520 7853 P. R. of China up to 14400 bps 86 10 684 92351 Singapore up to 14400 bps 65 534 5693 Taiwan up to 14400 bps 886 2 377 5840 U.K. up to 28800 bps 44 1442 438278 U.S.A. up to 28800 bps 1 408 980 8204

Access by Digital Modem

ISDN users can call 3ComBBS using a digital modem for fast access up to 56 Kbps. To access 3ComBBS using ISDN, use the following number:

408 654 2703

Online Technical Services B-3

3ComFacts

Automated Fax

Service

3Com Corporation’s interactive fax service, 3ComFacts

, provides data sheets, technical articles, diagrams, and troubleshooting instructions on 3Com products 24 hours a day, 7 days a week.

Call 3ComFacts using your Touch-Tone telephone using one of these international access numbers:

Country Telephone Number

Hong Kong 852 2537 5610 U.K. 44 1442 278279 U.S.A. 1 408 727 7021

Local access numbers are available within the following countries:

Telephone

Country

Australia 1 800 123853 Netherlands 06 0228049 Belgium 0800 71279 Norway 800 11062 Denmark 800 17319 Portugal 0505 442 607 Finland 98 001 4444 Russia (Moscow only) 956 0815 France 05 90 81 58 Spain 900 964 445 Germany 0130 81 80 63 Sweden 020 792954 Italy 1678 99085 U.K. 0800 626403

Number

Country

Telephone Number

3ComForum on

CompuServe Online

Service

3ComForum is a CompuServe-based service containing patches, software, drivers, and technical articles about 3Com products, as well as a messaging section for peer support. To use 3ComForum, you need a CompuServe

account.

To use 3ComForum:

1 Log on to CompuServe. 2 Ty pe

go threecom

3 Press Return to view the 3ComForum main menu.

B-4 TECHNICAL SUPPORT

Support From Your Network Supplier

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

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

■ Diagnostic error messages

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

■ Details about recent configuration changes, if applicable

If you are unable to contact your network supplier, refer to the following section on how to contact 3Com.

Support From 3Com Corporation B-5

Support From 3Com Corporation

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

Contact your local 3Com sales office to locate your authorized service provider using one of the following numbers:

Regional Sales Office Telephone Number Regional Sales Office Telephone Number

3Com Corporation

U.S.A.

3Com ANZA

East West

3Com Asia Limited

China

Hong Kong India Indonesia Korea Malaysia Singapore Taiwan Thailand

3Com Benelux B.V.

Belgium Netherlands

3Com Canada

Calgary Montreal Ottawa Toronto Vancouver

3Com France

3Com GmbH

Austria Czech and Slovak Republics Germany

Hungary Poland Switzerland

800 NET 3Com or 1 408 764 5000

61 2 9937 5000 61 3 9866 8022

86 10 68492 568 (Beijing) 86 21 6374 0220 Ext 6115 (Shanghai) 852 2501 1111 91 11 644 3974 62 21 523 9181 82 2 319 4711 60 3 732 7910 65 538 9368 886 2 377 5850 662 231 8151 4

32 725 0202 31 30 6029700

403 265 3266 514 683 3266 613 566 7055 416 498 3266 604 434 3266

33 1 69 86 68 00

43 1 5134323 42 2 21845 800 49 30 3498790 (Berlin) 49 89 627320 (Munich) 36 1 250 83 41 48 22 6451351 41 31 996 14 14

3Com Ireland

3Com Japan

3Com Latin America

Argentina Brazil Chile Colombia Mexico Peru Venezuela

3Com Mediterraneo

Italy

3Com Middle East

3Com Nordic AB

Denmark Finland Norway Sweden

3Com Russia

3Com South Africa

3Com UK Limited

353 1 820 7077 81 3 3345 7251

54 1 312 3266 55 11 546 0869 56 2 633 9242 57 1 629 4110 52 5 520 7841 51 1 221 5399 58 2 953 8122

39 2 253011 (Milan) 39 6 5279941 (Rome)

971 4 349049

45 39 27 85 00 358 0 435 420 67 47 22 18 40 03 46 8 632 56 00

007 095 2580940 27 11 807 4397 44 131 2478558 (Edinburgh)

44 161 8737717 (Manchester) 44 1628 897000 (Marlow)

B-6 TECHNICAL SUPPORT

Returning Products for Repair

Accessing the 3Com MIB

Before you send a product directly to 3Com for repair, you must first obtain a Return Materials Authorization (RMA) number. Products sent to 3Com without RMA numbers are returned to the sender unopened, at the sender’s expense.

To obtain an RMA number, call or fax:

Country Telephone Number Fax Number

U.S.A. and Canada 1 800 876 3266, option 2 408 764 7120 Latin America 1 408 326 7801 408 764 7120 Europe, South Africa and

Middle East Outside Europe, U.S.A.,

and Canada

44 1442 438125 44 1442 435822

1 408 326 7804 1 408 764 7120

The 3Com Management Information Base (MIB) describes commands that enable you to manage 3Com SNMP-based products. The MIB is available over the Internet on an anonymous FTP server. Updates to these MIBs are released as new 3Com products are introduced.

To access Internet versions:

1 FTP to

ftp.3com.com (151.104.9.65).

2 Enter the login name anonymous . 3 Enter your full Internet e-mail address as the password

(for example,

4 Change to the /pub/mibs directory using the command

jdoe@company.com).

cd/pub/mibs.

5 Read the readisd.txt file to determine the MIB or MIBs you need to

manage your 3Com products.

6 To view the 3Com MIB, OID, or schema entries, enter the

■ To pause the display, press Ctrl+S.

■ To continue the display, press Ctrl+Q.

ls command.

7 Copy the MIB, OID, or schema files to your current directory using the

appropriate command (for example,

8 Exit the FTP session using the

quit command.

get isd.mib).

Contacting 3Com Technical Publications B-7

Contacting 3Com Technical Publications

02/06/97

If you have comments or questions on 3Com Technical Publications documents, contact the Technical Publications group by fax at (508) 229-1551.

INDEX

Numerics

10BASE-T

transceivers

20/40-Port module, 3-24

20-Port module, 3-23 40-Port module, 3-23 configuring, 3-10 hot swap capability, 1-2 installing, 3-7 LEDs, 3-24 module status LEDs, 4-2 network configurations, 2-1 port status LEDs, 4-3 procedures for handling, 3-2 theory of operation, 1-6

20/40-Port module LEDs

interpreting

3Com Bulletin Board Service (3ComBBS), B-2 3Com sales offices, B-5 3Com URL, B-2 3ComFacts, B-3 3ComForum, B-3

, 2-6

, 3-24

Component side view, 3-18 CompuServe, B-3 Configuration distance calculation

sample

Configuration rules

Configuring

CoreBuilder 5000 hub

, 2-6

fiber backbone general, 2-1, 2-3 twisted pair backbone, 2-7

20/40-Port module

hot swap capabilities

, 2-5, 2-6, 2-7

, 3-10

, 3-7

Daughter cards

gathering statistics

DIP switch

, 3-4, 3-5, 3-10

location module configuration, 3-4 overview, 3-4 settings, 3-4, 3-15, 3-18

, 1-2

Audience of Manual, 1

Backbone

fiber medium

Bi-color LED operation, 3-25 Bridges, 2-5 bulletin board service, B-2

, 2-1

Cabling

connectors equivalent distance, 2-7 fiber backbone, 2-5, 2-6, 2-7 redundant links, 2-14, 2-15 twisted pair backbone, 2-7

Chapter descriptions, 1

, A-3

Electrical specifications, A-1 Electro static discharge

precautionary procedures

Environmental specifications, A-2 Equivalent distance, 2-7 Ethernet

four-repeater rule

, 3-2

, 2-7

fax service. See 3ComFacts FCC notice Fiber backbone

Fiber backbones, 2-5 Fiber equivalent distance, 2-7 Fiber link distances, 2-3 Front panel indicators

, ii

twisted pair to-the-desk

activity LEDs

, 3-24

, 2-6

2 INDEX

General specifications, A-2

Installation

hot swap capabilities installing the module, 3-7, 3-9 quick installation chart, 3-3

Isolated network, 2-9

, 3-7

LAN product equivalent distances, 2-4 LED and network verification, 3-24 LEDs

how to verify

Link Integrity

configuring with network management

description, 3-13 link integrity, 3-18 Logical network, 2-9

, 3-24

Mechanical specifications, A-2 MIBs

3Com Module

Module configurations

, B-6

20-Port

, 1-4

40-Port, 1-4

installing, 3-3

overview, 1-4

segment, 3-4

show command

, 3-16

Network

assignment

configurations, 2-6

unshielded twisted pair, 2-8 Network management, 3-10

configuring, 3-11

monitoring ONline modules, 3-19

with slave module, 3-11 Network selection, 3-15

per connector, 3-15 network supplier support, B-4

, 3-15

, 3-13

Online technical services, B-1

Patch panels, 2-9 Per-port statistics

ONline module restrictions

Per-port switching, 1-3 PLC

Private Line Card security, 1-2

Port redundancy, 3-12

switchover conditions, 2-15

Ports

description

Private Line Card, 1-2 Procedures for unpacking, 3-2

, 1-2

, 3-11

, 3-19

Redundancy, 2-15

between ports on two 20/40-Port modules, 2-15 between two ports on one 20/40-Port module,

2-14

Redundant links, 2-13 Repeater statistics, 3-19 Repeaters, 2-5 returning products for repair, B-6

Segments

Set port squelch, 3-14 Simple Network Management Protocol (SNMP)

SNMP. See Simple Network Management Protocol Specifications

Squelch mode command, 3-14 Squelch settings

Star topology, 2-2 Status LEDs

, 3-19

isolated non-isolated, 3-19

commands

, B-6

, A-1

electrical, A-1 environmental, A-2 general, A-2 mechanical, A-2

low

, 3-14

normal, 3-14

troubleshooting

, 4-3

Technical Assistance, 4-4 Technical Support, 4-4 technical support, B-1

3Com URL, B-2 bulletin board service, B-2 fax service, B-3 network suppliers, B-4 product repair, B-6 using CompuServe, B-3

Troubleshooting

module status LED port status LEDs, 4-3 Technical Assistance, 4-4

Twisted pair

cables

, A-4

connectors, A-3

Twisted pair cables

connecting

Twisted pair configuration

redundant links

Twisted pair wiring

configuration rules

, 4-2

, A-4

, 2-14

, 2-5

INDEX 3

Unshielded twisted pair, 2-6, 2-8 URL, B-2

Verification

network assignments

, 3-24

Workgroups, 2-9 World Wide Web, B-2 WWW, B-2

3Com Corporation LIMITED WARRANTY

For purposes of this warranty, the CoreBuilder 5000 Ethernet 20-Port and 40-Port 10BASE-T Modules are considered Internetworking products.

HARDWARE 3Com warrants its hardware products to be free from defects in workmanship and materials, under

normal use and service, for the following lengths of time from the date of purchase from 3Com or its Authorized Reseller:

Internetworking products 1 year

Network adapters Lifetime

Ethernet stackable hubs and Unmanaged Ethernet fixed port repeaters Lifetime*

*Power supply and fans in the stackable hubs and unmanaged repeaters 1 year

Other hardware products 1 year

Spare parts and spares kits 90 days

If a product does not operate as warranted above during the applicable warranty period, 3Com shall, at its option and expense, repair the defective product or part, deliver to Customer an equivalent product or part to replace the defective item, or refund to Customer the purchase price paid for the defective product. All products that are replaced will become the property of 3Com. Replacement products may be new or reconditioned. Any replaced or repaired product or part has a 90-day warranty or the remainder of the initial warranty period, whichever is longer.

3Com shall not be responsible for any software, firmware, information, or memory data of Customer contained in, stored on, or integrated with any products returned to 3Com for repair, whether under warranty or not.

(1 year if not registered)

SOFTWARE 3Com warrants that the software programs licensed from it will perform in substantial conformance to the

program specifications therefor for a period of 90 days from the date of purchase from 3Com or its Authorized Reseller. 3Com warrants the media containing software against failure during the warranty period. No updates are provided. 3Com’s sole obligation with respect to this express warranty shall be (at 3Com’s discretion) to refund the purchase price paid by Customer for any defective software products, or to replace any defective media with software which substantially conforms to 3Com’s applicable published specifications. Customer assumes responsibility for the selection of the appropriate applications program and associated reference materials. 3Com makes no warranty or representation that its software products will work in combination with any hardware or applications software products provided by third parties, that the operation of the software products will be uninterrupted or error free, or that all defects in the software products will be corrected. For any third-party products listed in the 3Com software product documentation or specifications as being compatible, 3Com will make reasonable efforts to provide compatibility, except where the noncompatibility is caused by a “bug” or defect in the third party’s product.

STANDARD WAR RANTY S

ERVICE

WARRANTIES EXCLUSIVE IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, CUSTOMER’S SOLE REMEDY FOR

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

BREACH OF THAT WARRANTY SHALL BE REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM’S OPTION. TO THE FULL EXTENT ALLOWED BY LAW, THE FOREGOING WARRANTIES AND REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES, TERMS, OR CONDITIONS, EXPRESS OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, STATUTORY OR OTHERWISE, INCLUDING WARRANTIES, TERMS, OR CONDITIONS OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND SATISFACTORY QUALITY. 3COM NEITHER ASSUMES NOR AUTHORIZES ANY OTHER PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE, OR USE OF ITS PRODUCTS.

3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION DISCLOSE THAT THE ALLEGED DEFECT IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY CUSTOMER’S OR ANY THIRD PERSON’S MISUSE, NEGLECT, IMPROPER INSTALLATION OR TESTING, UNAUTHORIZED ATTEMPTS TO REPAIR OR MODIFY, OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE, LIGHTNING, OR OTHER HAZARD.

LIMITATION OF LIABILITY TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO EXCLUDES FOR ITSELF AND ITS SUPPLIERS ANY

LIABILITY, WHETHER BASED IN CONTRACT OR TORT (INCLUDING NEGLIGENCE), FOR INCIDENTAL, CONSEQUENTIAL, INDIRECT, SPECIAL, OR PUNITIVE DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE OR PROFITS, LOSS OF BUSINESS, LOSS OF INFORMATION OR DATA, OR OTHER FINANCIAL LOSS ARISING OUT OF OR IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE, USE, PERFORMANCE, FAILURE, OR INTERRUPTION OF ITS PRODUCTS, EVEN IF 3COM OR ITS AUTHORIZED RESELLER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, AND LIMITS ITS LIABILITY TO REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM’S OPTION. THIS DISCLAIMER OF LIABILITY FOR DAMAGES WILL NOT BE AFFECTED IF ANY REMEDY PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL PURPOSE.

Some countries, states, or provinces do not allow the exclusion or limitation of implied warranties or the limitation of incidental or consequential damages for certain products supplied to consumers, so the above limitations and exclusions may be limited in their application to you. This warranty gives you specific legal rights which may vary depending on local law.

GOVERNING LAW This Limited Warranty shall be governed by the laws of the state of California.

3Com Corporation, 5400 Bayfront Plaza, Santa Clara, CA 95052-8145 (408) 764-5000

10/20/96

3com CoreBuilder 5000 User Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

CONTENTS

FIGURES

TABLES

HOW TO USE THIS GUIDE

Audience This guide is intended for the following people at your site:

Structure of This Guide

Document Conventions

Related Documents This section provides information on supporting documentation,

■ 3Com Documents

■ Reference Documents

INTRODUCTION

Theory of Operation

Where to Go From Here

Understanding General Network Configuration Rules

Basic Network Rules Table 2-1

■ Fiber Backbone Configuration Rules

■ Twisted Pair Backbone Configuration Rules

Using Patch Panels 2-9

Using Module Workgroups

■ Workgroup Definition

Workgroup Example

Setting Redundant Links

Where to Go From Here

Precautionary Procedures

Unpacking Procedures

Quick Installation 3-3

Setting DIP Switches

Using DIP Switches Use the DIP switch to:

DIP Switch Definition Table 3-2 briefly describes the DIP switch settings. Each DIP switch

Installing the Module

Configuring the Module

■ Enable/Disable/ Shutdown Ports

Set Port Redundancy This command allows you to set redundancy between ports. When

Set Alert Filter This command allows you to override the PORT FILTER feature on a

Set Auto Polarity This command enables the 20/40-Port module to automatically switch

Set Port Squelch This command allows you to establish the squelch level as either

Network Selection This command provides port-level configuration flexibility using the

Assigning Ports On the Module to a Network

Assigning a Monitor Card to a Network

Showing Module Configurations

Show Port Command This command enables users to display brief and verbose information

Attaching the Network Monitor Card

Gathering Statistics 3-19

■ Gathering Statistics

■ Monitoring the Network

Monitor Command

Show Counter Command

Monitoring the Front Panel

Module Status LED A single LED located at the top left of the faceplate indicates the status

Verifying LEDs and the Network

Where to Go From Here

TROUBLESHOOTING

Troubleshooting Using the Module Status LED

Troubleshooting Using the Port Status LEDs

Technical Assistance

Where to Go From Here

Electrical Specifications

SPECIFICATIONS

Environmental Specifications

Mechanical Specifications

General Specifications

Twisted Pair Connectors and Cables

■ Twisted Pair Connectors

Twisted Pair Cables The twisted pair cables used in your configuration must meet the

Connecting Twisted Pair Cables

TECHNICAL SUPPORT

Online Technical Services

World Wide Web Site Access the latest networking information on 3Com Corporation’s World

Access by Analog Modem

Access by Digital Modem

Support From Your Network Supplier

Support From 3Com Corporation

Returning Products for Repair

Contacting 3Com Technical Publications

INDEX

3Com Corporation LIMITED WARRANTY