3com CoreBuilder 5000 Ethernet 36-Port 10BASE-T Module User Guide

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CoreBuilder™ 5000

Ethernet 36-Port 10BASE-T Module User Guide

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Document Number 17-00629-3 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.

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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.

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 Unpublished rights reserved under the copyright laws of the United States.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

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of Sun Microsystems, Inc.

iii

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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

36-Port 10BASE-T Module Description 1-2 36-Port 10BASE-T Module Features and Benefits 1-2 Theory of Operation 1-5

Sample Module Application 1-5

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 Equivalent Requirements 2-4

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

Fiber Backbone Configuration Rules 2-5 Fiber Backbone, Twisted Pair to-the-Desk Configuration Example 2-6 Verifying Fiber Backbone Configuration 2-7

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

Twisted Pair Backbone Configuration Rules 2-8 Twisted Pair Backbone, Twisted Pair to-the-Desk Configuration

Example 2-8 Determining Fiber Equivalent Distance 2-9

Using Patch Panels 2-9

Using Module Workgroups 2-10

Workgroup Definition 2-10 Dividing the Network into Workgroups 2-11

Setting Redundant Links 2-15

Setting Redundancy Between Two Ports on One 36-Port 10BASE-T Module 2-16

Setting Redundancy Between Ports on Two 36-Port 10BASE-T Modules 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

DIP Switch Features 3-4 Setting the DIP Switches 3-4 DIP Switch Definition 3-5

Installing the Module 3-7

Attaching the Tie-Wrap Bracket 3-11

Before You Begin 3-11

Configuring the Module 3-14

Configuration Overview 3-14 Set Port Mode Commands 3-15

Enable/Disable/Shutdown Ports Command 3-15 Setting Port Redundancy Command 3-15

Setting Remote Diagnostics Command 3-16 Enable/Disable Link Integrity Command 3-16 Set Port Alert Filter Command 3-16 Set Port Auto Polarity Command 3-17 Network Selection 3-17

Assigning Connectors on the Module to a Network 3-18

Assigning a Monitor Card to a Network 3-18

Showing Module Configurations 3-19

Show Module Command 3-19 Show Port Command 3-19

Connecting Module Daughter Cards 3-21

Gathering Statistics 3-23

Repeater Statistics 3-23 Ethernet and RMON Statistics 3-23

Monitoring Network Statistics 3-24

Monitor Command 3-24 Show Counter Command 3-25

Monitoring the Front Panel 3-27

Module Status LED 3-27 Port Status and Activity LEDs 3-27

Verifying LED and Network Operation 3-29

Using the CoreBuilder 5000 Controller Module to Verify Bicolor LED Operation 3-30

Using the DMM to Verify Network Connections 3-30

Verifying Network Connections for the 36-Port 10BASE-T Module 3-31

4 TROUBLESHOOTING

Troubleshooting Using the Module Status LED 4-1 Troubleshooting Using the Port Status LEDs 4-2 Technical Assistance 4-3

A SPECIFICATIONS

Electrical Specifications A-1 Environmental Specifications A-1 Mechanical Specifications A-2 General Specifications A-2 50-Pin Connector and Cable A-3 Twisted Pair Connectors and Cables A-5

Twisted Pair Connectors A-5 Twisted Pair Cables A-6

Connecting Twisted Pair Cables A-6

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 36-Port 10-BASE-T Module Faceplate 1-4 1-2 Sample 36-Port 10BASE-T Module Application 1-5 2-1 Sample Configuration Distance Calculation 2-6 2-2 Twisted Pair Network 2-8 2-3 Typical Corporate Organizational Structure 2-11 2-4 36-Port 10BASE-T Module Workgroup Port Allocation 2-13 2-5 Redundant Twisted Pair Configuration 2-15 3-1 36-Port 10BASE-T Module 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 50-Pin Connector Cable Connection 3-10 3-5 Attaching the Tie-Wrap Bracket to the 36-Port Module 3-12 3-6 Attaching Cables With 90° Connectors 3-13 3-7 Attaching the CoreBuilder 5000 Ethernet Monitor Card 3-22

3-8 36-Port 10BASE-T Module Faceplate 3-28 A-1 50-Pin Cable Male and Female Connectors A-3 A-2 RJ-45 Connector Pinouts A-5

TABLES

2-1 Seven Basic Network Rules 2-2

2-2 LAN Product Equivalent Distances 2-4

2-3 Sample Network Reorganization 2-12

3-1 Quick Installation Checklist 3-3

3-2 Network Selection DIP Switch Settings 3-6

3-3 36-Port 10BASE-T Module LED Interpretations 3-29

4-1 Module Status LED Troubleshooting 4-1

4-2 Port Status LED Troubleshooting 4-2 A-1 50-Pin Cable Pinouts and Port Assignments A-4

HOW TO USE THIS GUIDE

This guide explains how to install and operate the 3Com CoreBuilder information on monitoring the module using the 3Com CoreBuilder 5000 Distributed Management Module. An appendix explains cabling guidelines, specifications, and options for the Ethernet 36-Port 10BASE-T Module.

Before installing or using the 36-Port 10BASE-T Module, read Chapters 1, 2, and 3 of this guide for basic installation and operating instructions.

™

5000 Ethernet 36-Port 10BASE-T Module. It also includes

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:

Chapter 1, Introduction – Introduces the functions and features of the Ethernet 36-Port 10BASE-T Module.

Chapter 2, Designing and Expanding the Network – Shows possible network configurations using the CoreBuilder 5000 Integrated System Hub and the 36-Port 10BASE-T Module.

Chapter 3, Installing and Operating the Module – Provides illustrated procedures for installing the 36-Port 10BASE-T 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. In addition, this appendix provides information on 50-pin Telco-type connectors, 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

Text in angled brackets 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/snm/agents.

In the command above, substitute <rem_name> with the name of the remote machine.

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

of data

Warning Risk of severe personal injury

4 HOW TO USE THIS GUIDE

INTRODUCTION

This chapter describes the 3Com CoreBuilder™ 5000 Ethernet 36-Port 10BASE-T Module (Model Number 6136M-TPCL). For more information on the 3Com refer to the CoreBuilder 5000 Integrated System Hub Installation and Operation Guide.

The Ethernet 36-Port 10BASE-T Module requires the Distributed Management Module (DMM) Version 2.2 or later for full functionality.

This chapter contains the following sections:

■ 36-Port 10BASE-T Module Description

■ 36-Port 10BASE-T Module Features and Benefits

■ Theory of Operation

CoreBuilder 5000 Integrated System Hub,

1-2 CHAPTER 1: INTRODUCTION

36-Port 10BASE-T Module Description

36-Port 10BASE-T Module Features and Benefits

The 36-Port 10BASE-T Module is a connector-switching module which:

■ Supports Telco 50-pin connector-based 10BASE-T wiring

■ Enables users to assign a backplane segment at the connector level

of the module

■ Connects up to 36 devices (PCs, terminals, printers, modems) to

the 3Com CoreBuilder 5000 Integrated System Hub

■ Provides 36 10BASE-T-compliant ports using 25-pair 10BASE-T cables

or 12-leg hydra cables

The CoreBuilder 5000 Ethernet 36-Port 10BASE-T Module provides the following features:

■ Checks driver and receiver integrity using Remote Diagnostics Mode.

■ Supports security through the CoreBuilder 5000 Private Line Card

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

■ Allows you to connect up to two CoreBuilder 5000 Network

Monitor Cards for network management.

■ Allows you to install or remove the module without having to power

down the hub.

■ Supports scalable network management architecture which enables

you to gather Ethernet and Remote Network Monitoring (RMON) network statistics for any of the CoreBuilder 5000 backplane segments.

Each module supports two daughter cards including a Network Monitor Card (NMC) for in-depth monitoring of the network or a Private Line Card for private Ethernet conversations.

■ Provides easy configuration using the CoreBuilder 5000 Manager.

■ Supports three 12-port Telco 50-pin connectors which you can

switch (per connector) to any of the eight CoreBuilder 5000 hub backplane channels or eight extended segments in any combination of eight.

■ Provides per-connector switching to all eight of the

CoreBuilder 5000 hub backplane segments and eight isolated segments.

36-Port 10BASE-T Module Features and Benefits 1-3

■ 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.

■ Provides connector-switching connectivity for STP and UTP 10BASE-T

networks.

■ Maintains inventory information for the 36-Port 10BASE-T 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.

In addition, the 36-Port 10BASE-T Module supports Repeater Management Information Base (MIB) statistics without the need for a network monitor card.

1-4 CHAPTER 1: INTRODUCTION

Figure 1-1 illustrates the CoreBuilder 5000 36-Port 10BASE-T Module.

MODULE

STATUS

1 4

13 16 19 22

25 28 31 34

Module Status LED

Bi-color Status/Activity Status LEDs

1X-12X

50-pin connector (ports 1 to 12)

13X-24X

50-pin connector (ports 13 to 24)

25X-36X

50-pin connector (ports 25 to 36)

6136M-TPCL

Figure 1-1 CoreBuilder 5000 Ethernet 36-Port 10-BASE-T Module Faceplate

Theory of Operation 1-5

Theory of Operation

Sample Module

Application

The 36-Port 10BASE-T Module is a connector-switching Ethernet module that enables administrators to connect up to 36 network devices to the module using a patch panel or punch-down block for each Telco 50-pin connector.

You can attach the workstations in Figure 1-2

to the 36-Port 10BASE-T Module using a patch panel or punch-down block that is directly connected to the Telco 50-pin connectors on the 36-Port 10BASE-T Module. Each Telco 50-pin connector provides 12 twisted pair ports that enable you to connect up to 12 workstations (per connector) to the 36-Port 10BASE-T Module.

36-Port 10BASE -T Module

CoreBuilder 5000 Integrated System Hub

Patch

Workstation

Tel co-to-RJ45 connections

Figure 1-2 Sample 36-Port 10BASE-T Module Application

DESIGNING AND EXPANDING THE

NETWORK

This chapter describes how to configure networks that use the CoreBuilder Ethernet 36-Port 10BASE-T Module.

This chapter contains the following sections:

■ 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

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

™

5000 Integrated System Hub and the CoreBuilder 5000

, Specifications, for information

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 (connection to printers, computers). 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 Equivalent Requirements

2-2 CHAPTER 2: DESIGNING AND EXPANDING THE NETWORK

Before Configuring

Before configuring your network, consider your:

Your Network

■ Network size from end-to-end:

■ 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 an Ethernet switch or an additional internetworking device.

Basic Network Rules Table 2-1

■ Seven basic network rules to keep in mind when you construct

your network

■ 3Com

For hardware-specific information on the Ethernet 36-Port 10BASE-T Module, refer to Appendix A

Table 2-1 Seven Basic Network Rules

lists:

Corporation’s recommendations for these rules

, Specifications.

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 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 CHAPTER 2: DESIGNING AND EXPANDING THE NETWORK

LAN Equivalent

Requirements

LAN equivalence is the sum of the incoming and outgoing module port signals. When you configure your network, consider that each installed product reduces the network diameter.

Table 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 Modules 560

Incoming signal to fiber port 330

Outgoing signal from fiber port 230 CoreBuilder 5000 and ONline Ethernet Transceiver Modules 0 10BASE-FB Star Coupler (8 or 14 port) 180 CoreBuilder 5000 and ONline Ethernet BNC Modules 900

Incoming signal to BNC port 450

Outgoing signal from BNC port 450 CoreBuilder 5000 and ONline Ethernet Repeater Modules 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, Twisted Pair to-the-Desk Configuration Example

■ Verifying Fiber Backbone Configuration

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 2-2

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

) is:

the 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 Ethernet 36-Port 10BASE-T

Modules (see Table 2-2

■ 420 meters for signals that enter the Ethernet 36-Port 10BASE-T

) is:

Module port at the front panel.

■ 165 meters for signals that internally enter an Ethernet 36-Port

10BASE-T Module through the CoreBuilder 5000 hub backplane.

For each pair of Ethernet 36-Port 10BASE-T 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 Ethernet 36-Port 10BASE-T Module through one port and exits another port of the same Ethernet 36-Port 10BASE-T Module. The fiber equivalent distance counts as 585 meters of fiber equivalent distance and as a full repeater hop.

2-6 CHAPTER 2: DESIGNING AND EXPANDING THE NETWORK

Fiber Backbone,

Twisted Pair

to-the-Desk

Configuration

Example

Fiber backbone

1000 m

The sample configuration shown in Figure 2-1 uses 10BASE-T modules to connect to the transceivers A and B. Refer to the next section for a detailed explanation of configuration distances.

The 24-gauge unshielded twisted pair cable is used to connect 10BASE-T Transceivers to the Ethernet 36-Port 10BASE-T Modules in the hubs.

2 4

500 m

Fiber backbone

2 4

Hub A

Hub B

Hub C

Unshielded twisted pair

100 m

Unshielded twisted pair

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

Figure 2-1 Sample Configuration Distance Calculation

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

Verifying Fiber

Backbone

Configuration

To determine if your network configuration is legal:

1 Begin with 4200 meters. 2 Identify the two transceivers (A and B) that are the greatest fiber

equivalent distance apart. In Figure 2-1

, 10BASE-T transceivers A and B

are the farthest apart.

3 Determine the sum of each hub’s equivalent distance using the

distances listed 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 (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.

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.

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

This section describes:

■ Twisted Pair Backbone Configuration Rules

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

Example

■ Determining Fiber Equivalent Distance

2-8 CHAPTER 2: DESIGNING AND EXPANDING THE NETWORK

Twisted Pair

Backbone

Configuration Rules

Twisted Pair

Backbone, Twisted

Pair to-the-Desk

Configuration

Example

When you configure a network with twisted pair cabling to the desk and twisted pair for the backbone, the following rule applies:

■ Add a bridge if you have more than eight 36-Port modules serially

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

■ 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.

Figure 2-2

illustrates a twisted pair network using 24-gauge cable.

100 m

Figure 2-2 Twisted Pair Network

50 m

Using Patch Panels 2-9

Determining Fiber

Equivalent Distance

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 Ethernet 36-Port 10BASE-T 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 for more information on LAN product equivalent distances.

Although the twisted pair network example in Figure 2-2

only uses Ethernet 36-Port 10BASE-T Modules, it is also possible to use other 10BASE-T Modules.

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

illustrates a legitimate configuration.

Using Patch Panels Patch panels make cable management easier by organizing the cables

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 user guide. Each additional patch panel in the link reduces the 100 meter link distance by approximately 10 meters.

In the example shown in Figure 2-2

■ If you use two patch panels to connect the upper right PC and the

upper 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.

, the following conditions exist:

2-10 CHAPTER 2: DESIGNING AND EXPANDING THE NETWORK

■ A patch panel installed between the lower right PC and the lower

left hub does not affect the link because the patch panel is only 50 meters away. Patch panels only affect lengths greater than 90 meters.

Using Module Workgroups

Workgroup

Definition

When you set up an Ethernet 36-Port 10BASE-T Module as a fully configured workgroup module, the resultant logical network configuration supports up to three workgroups (isolated networks) per module. Because a managed CoreBuilder 5000 hub may contain as many as 16 Ethernet 36-Port 10BASE-T modules, it is possible to configure your hub with a maximum of 48 workgroups.

This section describes:

■ Workgroup Definition

■ Dividing the Network into Workgroups

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

Workgroups:

■ Provide administrators with 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 Ethernet 36-Port 10BASE-T Module has access to eight backplane and eight isolated segments, the module only supports per-connector switching to three segments simultaneously.

Using Module Workgroups 2-11

Dividing the Network

into Workgroups

Dividing the Network

into Workgroups

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

A network administrator plans to reorganize the development and support organizations in the 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

Organizatio n

Marketing

Technical

Publication s

Support

Organization

Figure 2-3 Typical Corporate Organizational Structure

2-12 CHAPTER 2: DESIGNING AND EXPANDING THE NETWORK

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

1 After analyzing departmental needs, the network administrator

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

10BASE-T

Department

Engineering Department

Technical Support

Marketing 36-Port 1 WG4 1 to 12 Technical

Publications

2 As Ta b le 2 - 3

Module Type

36-Port 3 WG2 13 to 24

36-Port 6 WG3 13 to 24

36-Port 8 WG1 25 to 36

indicates, the network administrator assigns four

Module Slot Number

Workgroup Number

organizations within the company to separate workgroup numbers (WG1 to WG4). The workgroups can:

■ Share resources

■ Communicate with each other without using the hub backplane

Ports Used

Using Module Workgroups 2-13

Figure 2-4 illustrates each workgroup configuration.

HUB C

Slot 4

WG4

KEY

WGx

WG2

Slot 1 Slot 3 Slot 6 Slot 8

= Module Workgroup Network (where x is the workgroup numbe r) = Internal Bridg e

= Port allocated to inter na l brid ge

= Workgroup

WG3

WG1

Figure 2-4 36-Port 10BASE-T Module Workgroup Port Allocation

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

By dividing the network into workgroups, you:

■ Increase the available number of backplane resources

■ Decrease overall backplane traffic

2-14 CHAPTER 2: DESIGNING AND EXPANDING THE NETWORK

3 In Figure 2-4, the network administrator 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 48 module workgroup networks)

■ Network configuration is more flexible because administrators are

not limited to 8 backplane networks only

■ Less backplane traffic because communication between each

department is isolated from the hub backplane

If the network administrator had configured each of the workgroups on separate backplane segment networks instead of separate module workgroup networks, he or she would need to isolate 3 of the hub’s 8 backplane segments from the rest of the network.

By configuring the departments as module workgroup networks instead of separate backplane segment networks, the network administrator can configure a maximum of 48 workgroups per hub using little or no backplane traffic.

Setting Redundant Links 2-15

Setting Redundant Links

When you set up a redundant twisted pair link between ports on CoreBuilder 5000 Integrated System Hubs, the resultant configuration prevents a network failure. Figure 2-5

shows two examples of a

redundant configuration.

21 22

20 21

Redundancy set up between two ports on the same module.

Redundancy set up between two ports on different modules.

Figure 2-5 Redundant Twisted Pair Configuration

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

2-16 CHAPTER 2: DESIGNING AND EXPANDING THE NETWORK

Setting Redundancy

Between Two Ports

on One 36-Port

10BASE-T Module

Setting Redundancy

Between Ports on

Two 36-Port

10BASE-T Modules

To connect two links to two ports on one Ethernet 36-Port 10BASE-T Module:

1 Issue the SET PORT MODE REDUNDANT 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 POR T 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.

To connect two links to two ports between two Ethernet 36-Port 10BASE-T Modules:

1 Issue the SET PORT MODE REDUNDANT 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 inter-module redundancy on the Ethernet 36-Port 10BASE-T 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 down and then up without a 3Com network management module in the hub.

Once you configure redundancy:

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

■ Link failure

■ Port partition

Setting Redundant Links 2-17

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

the system performs a switchover back to the primary link automatically. The failure or port partition problem is then 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 Ethernet

36-Port 10BASE-T Module ports.

INSTALLING AND OPERATING THE

MODULE

This chapter describes the installation of the CoreBuilder™ 5000 Ethernet 36-Port 10BASE-T Module.

A module reference card for the Ethernet 36-Port 10BASE-T Module (Document Number 17-00630) lists the DIP switch settings, Ethernet 36-Port 10BASE-T Module management commands, LED indicators, and other module information. Store the card in the CoreBuilder 5000 hub binder in the Reference Card section.

This chapter contains the following sections:

■ Precautionary Procedures

■ Unpacking Procedures

■ Quick Installation

■ Setting DIP Switches

■ Installing the Module

■ Configuring the Module

■ Showing Module Configurations

■ Connecting Module Daughter Cards

■ Gathering Statistics

■ Monitoring the Front Panel

■ Verifying LED and Network Operation

Read the precautionary procedures before unpacking the module.

3-2 CHAPTER 3: INSTALLING AND OPERATING THE MODULE

Precautionary Procedures

CAUTION: Electrostatic discharge (ESD) can damage static-sensitive devices on circuit boards.

Follow these precautions when you handle the 36-Port 10BASE-T Module:

■ Do not remove the board from its antistatic shielding bag until you

are ready to inspect or install it.

■ Handle the board by the faceplate only.

Use one of the following proper grounding techniques when you install the 36-Port 10BASE-T 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 and I/O cards.

Unpacking Procedures

To unpack the 36-Port 10BASE-T Module:

1 Verify that the 36-Port 10BASE-T Module (Model Number 6136M-TPCL)

is the model you ordered by checking the Model Number listed on the side of the shipping carton.

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 36-Port 10BASE-T 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 36-Port 10BASE-T 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.

Quick Installation 3-3

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

Record the serial number of your 36-Port 10BASE-T 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 36-Port 10BASE-T module into one

6 Establish connections from the 36-Port

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

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.

open slot in the hub. Fasten the ejectors and tighten the faceplate screws.

10BASE-T 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 Network Operation

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

3-4 CHAPTER 3: 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 go to the section

Installing the Module

The CoreBuilder 5000 Ethernet 36-Port 10BASE-T Module has an 8-position DIP switch. All of the DIP switch settings on the 36-Port 10BASE-T Module are ignored if an appropriate CoreBuilder 5000 Distributed Network Management Module (DMM Version v2.2 or later, for example) is already installed in the hub. Use network management commands, rather than the DIP switches, to configure the module.

This section describes:

■ DIP Switch Features

■ Setting the DIP Switches

■ DIP Switch Definition

DIP Switch Features Use the DIP switch to:

■ Select a network for all ports on the 36-Port 10BASE-T Module

■ Choose the primary module configuration:

■ Non-volatile RAM configuration (software configuration)

in this chapter.

Setting the DIP

Switches

■ DIP segment selection (DIP-specified module configuration)

You cannot assign connectors to different networks using the DIP switches on the 36-Port 10BASE-T Module. You must use network management commands.

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 Network 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 location on the module.

1 2 3

4 5 6 7 8

DIP switches

234 5678

On 1

Off 0

DIP settings

ISOLATE

CH SEL 2

CH SEL 0

CH SEL 1

NOT USED

DIP switch location

Backplane DIN connector

Figure 3-1 36-Port 10BASE-T Module DIP Switch Location

DIP Switch Definition Each DIP switch function is defined in the section Configuring the

Module later in this chapter.

Table 3-2

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

describes the following DIP switch settings:

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

■ 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 CHAPTER 3: INSTALLING AND OPERATING THE MODULE

Table 3-2 Network Selection DIP Switch Settings

Network Selection

Switch Settings

Switch 4 Switch 3 Switch 2 Switch 1

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 N/A N/A N/A

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

precedence over DIP Switch settings 1 through 4.

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.

When the 36-Port 10BASE-T Module is first installed, the hub checks for configuration settings in the DMM and decides the following:

■ If the hub is managed, the module uses the settings from the DMM.

■ If the hub is unmanaged, then the 36-Port 10BASE-T Module:

■ Checks for configuration settings stored in NVRAM.

■ Checks the DIP switches for configuration information if there are

no configuration settings in NVRAM or DIP Switch 5 is set to DIP-switch controlled configuration.

Installing the Module 3-7

Installing the Module

You do not need to power off the CoreBuilder 5000 Integrated System Hub to install

or remove the 36-Port 10BASE-T Module. You can insert

the module while the hub is operating (this is called a hot swap).

To install the 36-Port 10BASE-T Module:

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

the 36-Port 10BASE-T Module:

■ Properly ground yourself prior to handling the 36-Port 10BASE-T

Module.

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

mat prior to handling the 36-Port 10BASE-T Module.

2 Configure the 36-Port 10BASE-T Module:

■ If you plan to install the 36-Port 10BASE-T Module in a managed

hub (for example, DMM Version v2.2 or later), go to step 3

to complete the installation. To configure the appropriate settings, refer to the section Configuring the Module

■ If you plan to insert the 36-Port 10BASE-T Module in an

later in this chapter.

unmanaged hub, configure the DIP switch settings on the module to the desired settings (refer to the section Setting DIP

Switches earlier in this chapter) 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 details on power

requirements for each of the specified watts ranges. Refer to the CoreBuilder 5000 Distributed Management Module

Commands Guide for information on the SHOW POWER BUDGET command.

4 Locate an open slot in the hub. Remove the appropriate number of

blank panels on the hub to expose a slot for the module, if necessary.

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 a

CoreBuilder 5000 module.

3-8 CHAPTER 3: INSTALLING AND OPERATING THE MODULE

Figure 3-2 Installing a CoreBuilder 5000 Module

Installing the Module 3-9

6 Close the 36-Port 10BASE-T Module ejectors (Figure 3-3).

Open ed

eject or

Closed

ejector

Figure 3-3 Opened and Closed Module Ejectors

7 Using your fingers, fasten the spring-loaded screws on the front of the

36-Port 10BASE-T Module faceplate to the hub (do not overtighten).

8 Attach three 180° 50-pin cable connectors to the 50-pin connectors on

the front of the module (see Figure 3-4

), using the small screws included in the shipping carton. If you are using 90° connectors, refer to the section Attaching the Tie-Wrap Bracket

later in this chapter.

3-10 CHAPTER 3: INSTALLING AND OPERATING THE MODULE

9 Secure the cables to the module connectors as shown in Figure 3-4.

1 0

1 1

1 2

1 3

1 4

1 5

1 6

1 7

1 8

1 9

2 0 2

1 2

2 3

2 4

1 4 7

13 16 19 22

25 28 31 34

STATUS

1X-12X

13X-24X

MODULE

25X-36X

180 50-pin cable connectors

50-pin connector

6136M-TPCL

Figure 3-4 50-Pin Connector Cable Connection

10 Attach the other ends of the cables to a 10BASE-T transceiver, patch

panel, or a 10BASE-T adapter card.

Installing the Module 3-11

Attaching the

Tie-Wrap Bracket

This section describes how to attach a tie-wrap bracket to a 36-Port 10BASE-T Module.

You should use 180° connectors with the 36-Port 10-BASE-T Module. If, however, you currently use 90° cable connectors, use the following procedure to fasten the tie-wrap bracket to the connector on the module.

Before You Begin

Before attaching tie wraps to the 36-Port 10BASE-T Module connector, be sure that the module is equipped with two Tie-Wrap Kits (Part number 40-0166) that contain:

■ 1 screw

■ 1 anchor

■ 1 kit card

■ 1 bag

■ 3 tie wraps

Perform the procedure below prior to installing the module into the CoreBuilder 5000 hub.

To attach the tie-wrap bracket:

1 Remove the hex nut from the bottom of the module connector.

3-12 CHAPTER 3: INSTALLING AND OPERATING THE MODULE

2 Attach the tie-wrap bracket to the 36-Port 10BASE-T Module using the

Phillips-head screw provided in the Tie-Wrap Kit (Figure 3-5

Tie-wrap bracket

Phillips head screw

Figure 3-5 Attaching the Tie-Wrap Bracket to the 36-Port Module

Top

Insert the tie-wrap through the opening on the tie-wrap bracket

1 4 7

13 16 19 22

25 28 31 34

MODULE STATUS

1X-12X

13X-24X

25X-36X

6136M-TPCL

3 Insert the tie wrap through the opening on the tie-wrap bracket. 4 Attach the 90° cable connectors to the module connector as shown in

Figure 3-6

Installing the Module 3-13

MODULE

STATUS

1 4

13 16 19 22

21 22

28 31

1X-12X

13X-24X

50-pin connector

Standoff

25X-36X

50-pin cable connector

6136M-TPCL

Figure 3-6 Attaching Cables With 90° Connectors

5 Wrap the tie-wrap connector strap around the 50-pin cable connector

to secure the cable connector to the module connector.

6 Attach the other ends of the cables to a 10BASE-T transceiver, patch

panel, or a 10BASE-T adapter card.

Ensure that you do not fasten the tie wrap around the 36-Port 10BASE-T Module ejectors shown in Figure 3-3

3-14 CHAPTER 3: INSTALLING AND OPERATING THE MODULE

Configuring the Module

Configuration

Overview

This section describes how to configure the module using network management commands. The following network management commands are used to configure the 36-Port 10BASE-T Module:

■ Set Port Mode Commands

■ Enable/Disable Link Integrity Command

■ Set Port Alert Filter Command

■ Set Port Auto Polarity Command

■ Network Selection

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

Guide.

The CoreBuilder 5000 Distributed Management Module (DMM) provides network management for the CoreBuilder 5000 Integrated System 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 36-Port 10BASE-T Module are ignored if an appropriate CoreBuilder 5000 Distributed Network Management Module (DMM Version v2.2 or later) is already installed in the hub.

If network management is present when you first install the module, the:

■ Network defaults to isolated mode.

■ Ports are automatically disabled (so that users cannot join the

network undetected by network management).

Therefore, you must enable the ports you want to use and set the module ports to the appropriate network using management commands.

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

Configuring the Module 3-15

Set Port Mode

Commands

This section describes the following SET PORT MODE commands:

■ Enable/Disable/Shutdown Ports Command

■ Setting Port Redundancy Command

■ Setting Remote Diagnostics Command

Enable/Disable/Shutdown Ports Command

This command allows you to enable, disable, and shutdown each port on the 36-Port 10BASE-T 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.

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

SET PORT {

slot.port

{

slot

} MODE {disable}

.all} {enable}

{shu tdow n}

Setting Port Redundancy Command

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 .por t

} MODE {redundant} {

{non-redundant}

slot.port

}

For an example of port redundancy, refer to the section Setting

Redundant Links in Chapter 2.

3-16 CHAPTER 3: INSTALLING AND OPERATING THE MODULE

Setting Remote Diagnostics Command

This command allows the 36-Port 10BASE-T Module to detect certain unusual failure conditions when used with a 3Com Fault-Tolerant 10BASE-T Transceiver (including disruption of single wires in the twisted pairs). The Fault-Tolerant 10Base-T Transceiver Installation Guide describes this feature in detail.

Use the following command to set remote diagnostics:

Enable/Disable Link

Integrity Command

SET PORT {

slot.port

} MO DE {RE MO TE _DIA GN OSTIC S} [

{NON_REMOTE_DIAGNOSTICS}

slot .port

]

In the command above, the last variable, slot.port, 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 36-Port 10BASE-T Module in networks that comply with the 10BASE-T standard.

You should set link integrity to:

■ Disable – When connecting to older equipment that does not

comply with the 10BASE-T standard.

■ Enable – 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 {e nable }

Set Port Alert Filter

Command

This command allows you to override the PORT ALERT FILTER feature on a port-by-port basis. The PORT ALERT 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 Alert Filter to:

■ Enable – To use the PORT ALERT filtering feature.

Configuring the Module 3-17

■ 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 Auto

Polarity Command

SET PORT {

slot.port

{

slot.

all} {enable}

} ALERT _F ILTE R {d isabl e}

The following output is an example of the SET PORT ALERT_FILTER command issued for port 1 of a 36-port module in slot 1:

CB50 00> set po rt 1.1 aler t_filter di sable Port 01 .01 Alert Filter set to DISABLE

Set the SET ALERT PORT_UP_DOWN FILTER command before you use the SET PORT ALERT_FILTER command.

For more information on this command, refer to the CoreBuilder 5000 Distributed Management Module Commands Guide.

This command enables the 36-Port 10BASE-T 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 or disable auto polarity for a port:

SET PORT {

slot.port

{

slot.

all} {ena ble}

} AUTO_POLARITY {disable}

Network Selection This command provides connector-level configuration flexibility using

the unique architecture of the CoreBuilder 5000 Integrated System Hub. You can assign connectors to any of eight backplane segments or any of the eight isolated segments. 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.

3-18 CHAPTER 3: INSTALLING AND OPERATING THE MODULE

Assigning Connectors on the Module to a Network

Use the DIP switch settings on the 36-Port 10BASE-T Module to assign connectors on the module to network one through eight or to an extended segment. Network management, however, lets you assign one or more connectors to a network.

Use the following command to assign one or more connectors to a network:

SETMODULE{ CONNEC TOR _2_N ET WO RK {isola te d_1.. _8 } CONN ECTOR _3 _NET WO RK

slot.subsl ot

} CONNECTOR_1_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 Chapter 2, the section titled Using 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 36-Port 10BASE-T Module supports up to two daughter cards. You can assign the daughter cards to any of the eight backplane segments, whether or not any of the ports are assigned to that segment. You can also assign daughter cards to an isolated segment.

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

SET MO DUL E {

slot.subslot

} NE TWORK {ether net_ 1.. ._8}

{isola te d_1. .. _8}

The CoreBuilder 5000 Ethernet Network Monitor Card is configured as subslot 2 or 3 on the 36-Port 10BASE-T Module. The default, subslot 1, refers to the 36-Port 10BASE-T Module.

Showing Module Configurations 3-19

Showing Module Configurations

Show Module

Command

CB50 00> show m odule 10.1 verbose

Slot Module Version Network General Informat ion

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

10.01 6 136M-TPCL 1.00 PER_C ONNECTOR

6136M-TPCL: CB5000 Et hernet Te lco 10BAS E-T Module

Boot Versio n: 1.00 Network Dip Setting: I SOLATED_1 Network for Connector 01: ETHER NET_1 Network for Connector 02: ETHER NET_2 Network for Connector 03: ETHER NET_3 Non-Volatil e DIP Sett ing: ENABL ED

You can display status information about the 36-Port 10BASE-T Module using the following network management commands:

■ SHOW MODULE

■ SHOW PORT

This command enables users 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_ verbo se }

} {verbose}

The following output is an example of the SHOW MODULE VERBOSE command issued for a 36-Port 10BASE-T Module installed in slot 10:

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

on both individual ports and all ports collectively.

Use the following command to display port information:

SHOW PORT {

slot.port

{

slot.

all} {no_verbose}

} {ve rb os e}

3-20 CHAPTER 3: INSTALLING AND OPERATING THE MODULE

The following output is an example of the SHOW PORT ALL VERBOSE command issued for a 36-Port 10BASE-T Module installed in slot 10:

CB50 00> show p ort 10.all verbose

Port Di splay for Module 6136M -TPCL:

Port Mo de Status Network General In formatio n

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

10.01 E NABLED OK AY ETHER NET_1

Alert F ilter: ENABLED Port Co nnector: TELCO Link In tegrity: ENABLED Auto Po larity: ENABLED

10.02 D ISABLED LI NK FAILUR E E THERNET_1

Alert F ilter: ENABLED Port Co nnector: TELCO Link In tegrity: ENABLED Auto Po larity: DISABLE D

Port Mo de Status Network General In formatio n

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

10.03 D ISABLED LI NK FAILUR E E THERNET_1

Alert F ilter: ENABLED Port Co nnector: TELCO Link In tegrity: ENABLED Auto Po larity: DISABLE D

Connecting Module Daughter Cards 3-21

Connecting Module Daughter Cards

This section describes the location for connecting an Ethernet Network Monitor Card or a Private Line Card (PLC) to the 36-Port 10BASE-T Module. The 36-Port 10BASE-T Module supports up to two daughter cards. This capability gives you greater flexibility in both creating workgroups and configuring modules.

To monitor Ethernet and RMON statistics on your 36-Port 10BASE-T Module you must attach a CoreBuilder 5000 Ethernet Network Monitor Card (ENMC). Attach the ENMC to the network you want to monitor. The ENMC allows you to individually select and monitor each backplane segment on your CoreBuilder 5000 hub. You can assign this card to any of the eight isolated or backplane segments.

To provide continuous eavesdropping and intrusion protection without affecting network performance you must attach a CoreBuilder 5000 Private Line Card. Up to two Private Line Cards can be connected to the 36-Port 10BASE-T Module.

Use the same procedure for installing Ethernet Network Monitor Cards (NMC) when you install Ethernet Private Line Cards. The PLC is attached in the same subslot location as the NMC.

For details on installing network monitor cards, refer to the 3Com documentation that accompanies the CoreBuilder 5000 Ethernet Network Monitor Card.

3-22 CHAPTER 3: INSTALLING AND OPERATING THE MODULE

Figure 3-7 provides a component side view of the 36-Port 10BASE-T

Module with the Network Monitor Card orientation on the module.

Standoffs

Screw

DIP switch

SW1

sw2

sw3

sw4

sw5

sw6

sw7

sw8

Subslot 3

50-pin Telco connectors

Subslot 2

DB connectors

Figure 3-7 Attaching the CoreBuilder 5000 Ethernet Monitor Card

Monitor card

Backplane connector

Gathering Statistics 3-23

Gathering Statistics This section describes the following:

■ Gathering Statistics

■ Monitoring the Front Panel

Gathering Statistics The 36-Port 10BASE-T Module gathers the following statistics:

■ Repeater Statistics

■ Ethernet and RMON Statistics

Repeater Statistics

The 36-Port 10BASE-T Module gathers repeater statistics for each port (for example, collision, partition, late collision, data rate mismatch, and short event statistics). This module gathers repeater statistics without the use of a Network Monitor Card.

The repeater statistics that are available include:

■ Network – Network statistics are presented by gathering events

from all ports on the 36-Port 10BASE-T Module and other modules in the hub whose ports are on the same network and summarizing them.

■ Module – Module statistics summarize the events on all ports on a

specified module on the same network.

■ Port – Per-port statistics are a count of events from traffic entering

the module.

Ethernet and RMON Statistics

Unlike repeater statistics, Ethernet and RMON statistics (for example, single collision frames, internal MAC transmit errors, frame too long) are only available when a Network Monitor Card is defined. Use the MONITOR and SHOW COUNTER commands to view statistics. For an explanation on how to view these statistics, refer to the next section, Monitoring the Network.

3-24 CHAPTER 3: INSTALLING AND OPERATING THE MODULE

It is possible to install the monitor card on either the 36-Port 10BASE-T Module or the Distributed Management Module for Ethernet (DMM-EC). For more information on the DMM, refer to the

CoreBuilder 5000 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 36-Port 10BASE-T Module. If, however, the card is installed on the DMM-EC, it is possible to collect per-port statistics for ONline modules.

Monitoring Network

Statistics

The 36-Port 10BASE-T Module supports two daughter cards. You can assign these cards to any of the eight networks (isolated or backplane segments). The ability to support two cards provides greater flexibility in both creating workgroups and configuring modules.

Once the monitor card is attached to the 36-Port 10BASE-T Module, you can monitor statistics using the following commands:

■ MONITOR

■ SHOW COUNTER

Monitor Command

This command allows you to monitor each network (individually) by specifying the backplane or isolated segment to which the ports are configured.

Use the following command to monitor a network:

MONITOR {mm:ss} {ETHERNET} {ethernet_1..._8}

{REPEATER} {isolated_1..._8} {RMON}

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

Gathering Statistics 3-25

The following output is an example of the MONITOR ETHERNET command for a 36-Port 10BASE-T Module assigned to network Ethernet_1. This example monitors Ethernet_1 every 10 seconds:

CB50 00> monito r 00:10 et hernet et hernet_1

Ethernet Statistics for ETHERNET_1

--------------------------------------------------------------------Cumulative Last Time Inte rval

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

FCS Errors 0 0 SQE Test Errors 0 0 Alignment Errors 0 0 Carrie r Sense Err ors 0 0 Frame Too Lo ng 0 0 Deferr ed Transmi ssions 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 Rece ive Errors 0 0 Intern al MAC Tran smit Erro rs 0 0

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

Show Counter Command

This command provides you with detailed information on Ethernet and RMON statistics. Ethernet and RMON statistics-gathering requires a Network Monitor Card.

Use the following command to gather Ethernet and RMON statistics:

SHOW COUNTE R {E THER NE T} { ethe rn et_1 ..._8 }

{RMO N}

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

SHOW COUNTE R REP EA TER {isolat ed _x} {module }

3-26 CHAPTER 3: INSTALLING AND OPERATING THE MODULE

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

SHOW COUNTE R REP EATER {ethern et_1 ..._ 8} {

{isolat ed_1 ..._ 8} {

modu le}{slot port

}{

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 displays all statistics, at one time, since the last CLEAR COUNTER command.

The following output is an example of the SHOW COUNTER command listing RMON statistics:

CB50 00> show c ounter rmon hosts ethernet _1 mac_address 08-00- 19-A4-B3

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

}

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

Guide.

Monitoring the Front Panel 3-27

Monitoring the Front Panel

Use the LEDs on the front panel of the 36-Port 10BASE-T Module to monitor the status of each port. The 36-Port 10BASE-T Module has one Module Status LED and 36 bicolor port activity/status LEDs.

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

Port Status and

Activity LEDs

of the module (see Figure 3-8

The 36-Port 10BASE-T Module has one bicolor LED for each port. This LED is capable of displaying the following two colors:

■ Green – Displays port status information

■ Yellow – Displays port traffic information

3-28 CHAPTER 3: INSTALLING AND OPERATING THE MODULE

Figure 3-8 shows the location of the LEDs. Each LED indicates the state

of a port as described in Table 3-3

MODULE

STATUS

1 4 7

13 16 19 22

25 28 31 34

Module Status LED

Bi-color Status/Activity Status LEDs

1X-12X

50-pin connector (ports 1 to 12)

13X-24X

50-pin connector (ports 13 to 24)

25X-36X

50-pin connector (ports 25 to 36)

6136M-TPCL

Figure 3-8 36-Port 10BASE-T Module Faceplate

Verifying LED and Network Operation 3-29

Table 3-3 describes the states of port LEDs.

Table 3-3 36-Port 10BASE-T Module LED Interpretations

LED Name Color State Indicates

Module Status Green Off No power to hub or insufficient

power in the hub to support this module.

Software download to the 36-Port Module in progress.

Blinking One of the daughter cards failed

module diagnostics.

On Module OK. Port Activity/Status

(Ports 1 to 36)

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

36-Port Module in progress. Blinking Normal activity on the port.

Verifying LED and Network Operation

This section describes LED and Network verification for the 36-Port 10BASE-T Module, including:

■ Using the CoreBuilder 5000 Controller Module to Verify Bicolor LED

Operation

■ Using the DMM to Verify Network Connections

For more information on the DMM, refer to the CoreBuilder 5000 Distributed Management Module User Guide.

3-30 CHAPTER 3: INSTALLING AND OPERATING THE MODULE

Using the

CoreBuilder 5000

Controller Module

to Verify Bicolor 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 36-Port 10BASE-T 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 allows you to verify each network connection (both backplane 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 to 8 or Isolated 1 to 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.

Verifying LED and Network Operation 3-31

Verifying Network Connections for the 36-Port 10BASE-T Module

This section describes how to verify network connections for a newly installed 36-Port 10BASE-T Module. Assume you have one module that has ports connected to Ethernet Networks 1 and 3 (E1 and E3).

To verify this configuration:

1 Press 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 ports on the module are connected only to E1 and E3, the

network verification only lights the status LEDs associated with those networks. Conversely, if you had configured the 36-Port 10BASE-T Module with connections to all eight backplane networks, the network verification process would cycle through all eight networks.

TROUBLESHOOTING

Troubleshooting Using the Module Status LED

This chapter describes troubleshooting procedures for the CoreBuilder

™

5000 Ethernet 36-Port 10BASE-T Module. Information

on troubleshooting can assist you in verifying the module operation.

This chapter contains the following sections:

■ Troubleshooting Using the Module Status LED

■ Troubleshooting Using the Port Status LEDs

■ Technical Assistance

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 36-Port 10BASE-T 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 36-Port 10BASE-T Module.

Replace the failed daughter card.

4-2 CHAPTER 4: TROUBLESHOOTING

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

1 Blink Link Failure Cables not connected Connect cables.

2 Blinks Port

Off Ports

Indication Possible Cause Corrective Action

Cables broken Check cables using cable

tester. Repair or replace cables.

Link Integrity mismatch Make sure that both ends of

the connection have the same link integrity setting.

Faulty cable Check cable using cable

Partitioned

Disabled

Looped network Check network wiring

Ports disabled Enable ports. 36-Port 10BASE-T

Module not powered Broken LED Press the LED test on the

Bad 36-Port 10BASE-T Module

tester. Repair or replace cable.

topology and remove any loops that have been created.

Check the Controller Module Power LEDs.

Controller Module. Replace module.

Technical Assistance 4-3

Technical Assistance

You can receive assistance for installing and troubleshooting the 36-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 ONline network management

module being used

■ Version of software installed on your 36-Port 10BASE-T Module

■ Status of the front panel LEDs

■ Configuration of your network

■ 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 on contacting Technical Support

for your product.

Electrical Specifications

SPECIFICATIONS

This appendix lists specifications for the CoreBuilder™ 5000 Ethernet 36-Port 10BASE-T Module, including:

■ Electrical Specifications

■ Environmental Specifications

■ Mechanical Specifications

■ General Specifications

■ 50-Pin Connector and Cable

■ Twisted Pair Connectors and Cables

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

3Com CoreBuilder 5000 Integrated System Hub

Power Requirements +2 V = 0 w

+5 V = 15 w

-5 V = .85 ws +12 V = .102 w

-12 V = 0 w

Environmental 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 51.2

A-2 APPENDIX A: SPECIFICATIONS

Mechanical Specifications

General Specifications

Dimensions 1.0" W x 10.275" L x 14.37" H Weight 2.4 lbs

Cabling Compatible with the 10BASE-T Standard Collision Detection 100% deterministic Configuration Rule Supports IEEE 802.3 controllers and IEEE 802.3

repeaters Data Modulation Manchester Data Rate 10 Mbps Diagnostic Modulation Link integrity pulse Ethernet Interface Three 50-pin Telco connectors (each connector

supports 12 connections) Host Interface 3Com CoreBuilder 5000 Integrated System Hub bus

interface standard Installation Attachment Two or four thumbscrews on the faceplate Maximum Number of Nodes 1024 Number of Ports 36 Port Partitioning After 63 consecutive collisions

50-Pin Connector and Cable A-3

50-Pin Connector and Cable

Figure A-1 provides examples of a 50-pin cable (male) connector and a

50-pin (female) connector on the 36-Port 10BASE-T Module. Table A-1 lists the receive and transmit pairs, pinouts, and port assignments for a 50-pin cable.

50-pin cable connector (female)

50-pin cable connector (male)

5025

Patch panel, hydra cable or punchdown block

126

RJ-45 connector to desktop or transceiver

W-O BL W-BL O

W-G

2534 768

W-BR BR

Wire Color Key

W = White G = Green BL = Blue BR = Brown

Figure A-1 50-Pin Cable Male and Female Connectors

A-4 APPENDIX A: SPECIFICATIONS

Table A-1 50-Pin Cable Pinouts and Port Assignments

Hub

HubPort #

1 26 RX, + TX, + (1) 7 38 RX, + TX, + (1) 1 1 RX, - TX, - (2) 7 13 RX, - TX, - (2) 1 27 TX, + RX, + (3) 7 39 TX, + RX, + (3) 1 2 TX, - RX, - (6) 7 14 TX, - RX, - (6) 2 28 RX, + TX, + (1) 8 40 RX, + TX, + (1) 2 3 RX, - TX, - (2) 8 15 RX, - TX, - (2) 2 29 TX, + RX, + (3) 8 41 TX, + RX, + (3) 2 4 TX, - RX, - (6) 8 16 TX, - RX, - (6) 3 30 RX, + TX, + (1) 9 42 RX, + TX, + (1) 3 5 RX, - TX, - (2) 9 17 RX, - TX, - (2) 3 31 TX, + RX, + (3) 9 43 TX, + RX, + (3) 3 6 TX, - RX, - (6) 9 18 TX, - RX, - (6) 4 32 RX, + TX, + (1) 10 44 RX, + TX, + (1) 4 7 RX, - TX, - (2) 10 19 RX, - TX, - (2) 4 33 TX, + RX, + (3) 10 45 TX, + RX, + (3) 4 8 TX, - RX, - (6) 10 20 TX, - RX, - (6) 5 34 RX, + TX, + (1) 11 46 RX, + TX, + (1) 5 9 RX, - TX, - (2) 11 21 RX, - TX, - (2) 5 35 TX, + RX, + (3) 11 47 TX, + RX, + (3) 5 10 TX, - RX, - (6) 11 22 TX, - RX, - (6) 6 36 RX, + TX, + (1) 12 48 RX, + TX, + (1) 6 11 RX, - TX, - (2) 12 23 RX, - TX, - (2) 6 37 TX, + RX, + (3) 12 49 TX, + RX, + (3) 6 12 TX, - RX, - (6) 12 24 TX, - RX, - (6) Not Used Not

Pin #

Used

Function/ Polarity

Not Used Not Used Not Used 50 Not Used Not Used

Transceiver Function/ Polarity

HubPort #

Hub Pin #

Hub Function/ Polarity

Transceiver Function/ Polarity

Twisted Pair Connectors and Cables A-5

Twisted Pair Connectors and Cables

Twisted Pair

Connectors

Use the information in this section to ensure that the cables and connecting hardware meet requirements. You can use several types of cables and connectors to link the 36-Port 10BASE-T Module to your network. For proper operation, use only approved cables when you install all equipment.

This section describes:

■ 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

Figure A-2

shows an example of the recommended TIA-568A standard

pinouts for the RJ-45 connector and the cable.

RX Pair 2

Pair 4Pair 1TX Pair 3

12 34 5678

W-G G

W-O BL

RJ-45 transceiver connector pinouts

Figure A-2 RJ-45 Connector Pinouts

W-BR BRW-BL O

A-6 APPENDIX A: SPECIFICATIONS

Twisted Pair Cables Ensure the twisted pair cables used in your configuration 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 together with a striped wire that uses the same solid 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 Integrated System

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 APPENDIX B: 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 APPENDIX B: 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 APPENDIX B: 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

Symbols

½-repeater hop 2-8

Numerics

10BASE-T

transceivers

180° connector 3-9 36-Port 10BASE-T Module 1-4, 3-28

configuring 3-14 faceplate 3-28 hot swap capability 1-2 installing 3-7 module status LED 4-1 network configurations 2-1 port status LEDs 4-2 procedures for handling 3-2

theory of operation 1-5 3Com Bulletin Board Service (3ComBBS) B-2 3Com sales offices B-5 3Com URL B-2 3ComFacts B-3 3ComForum B-3 50-pin

cable pinouts

connector A-3

port assignment A-4 90° connector 3-9

2-6

A-4

Activity LEDs 3-29 Attaching tie wraps 3-11, 3-13 Audience of Manual 1 Auto Polarity command 3-17

Backbone

fiber medium Backup link 2-16 Bi-color LED operation 3-30 Bridges 2-5 bulletin board service B-2

2-1

Cable connector straps 3-13 Cabling

connectors equivalent distance 2-7 fiber backbone 2-5, 2-7 redundant links 2-16 twisted pair backbone 2-8

Component side view

module

CompuServe B-3 Configuration distance calculation 2-6 Configuration rules

fiber backbone general 2-1, 2-3 twisted pair backbone 2-8

using bridges 2-8 Configuring redundancy 2-17 Connector straps 3-13 Connector-switching 1-2, 1-3 CoreBuilder 5000 Integrated System Hub

hot swap capabilities

A-5

3-22

2-5, 2-7

3-7

Daughter cards 1-2, 3-18 Determining legal configuration 2-7 DIP switches

definition

location 3-4, 3-5, 3-14

module configuration 3-4

overview 3-4

settings 3-4, 3-17

3-5

Electrical specifications A-1 Electrostatic discharge

precautionary procedures ENMC 3-21 Environmental specifications A-1 Equivalent distance 2-7

3-2

2 INDEX

Faceplate

36-Port 10BASE-T Module fax service. See 3ComFacts FCC notice Fiber backbones 2-1

twisted pair-to-the-desk 2-5 Fiber equivalent distance 2-7 Fiber link distances 2-3

Gathering statistics 3-23 General specifications A-2

Hot swap capability 3-7 How to use this guide 1

Installation

hot swap capabilities

module 3-7, 3-9

quick installation chart 3-3 Installing connectors 3-9 Isolated network 2-10

3-7

1-4, 3-28

Mechanical specifications A-2 MIBs

Module

Module statistics 3-23 Module status LEDs 3-29 Monitor output example 3-25 Monitoring a network 3-18, 3-24 Monitoring backplane segments 3-21

B-6

3Com

assigning connectors component side view 3-22 installing 3-3 overview 1-4

3-18

Network

assignment configurations 2-7 monitoring 3-18 twisted pair 2-8 verifying assignments 3-29

Network management 3-14

configuring 3-14 monitoring ONline modules 3-24 slave module 3-14

Network selection 3-17

per connector 3-18 Network statistics 3-23 network supplier support B-4

3-17

LAN product equivalent distances 2-4 LEDs

verifying

Link Integrity command 3-16 Logical network 2-10

3-29

Management commands

assigning a monitor card disable port 3-15 enable or disable link integrity 3-16 enable port 3-15 set alert filter 3-16 set auto polarity 3-17 setting redundancy 3-15 setting remote diagnostics 3-16 show module 3-19 shutdown 3-15

3-18

Online technical services B-1

Patch panels 2-9 Per-port statistics

ONline module restrictions Per-port switching 1-2 Port Alert Filtering command 3-16 Port mode commands 3-15 Port redundancy

switchover conditions Port redundancy command 3-15 Port statistics 3-23 Port status 3-27 Port status LEDs

troubleshooting Primary link 2-16 Private Line Cards (PLC) 1-2, 3-21 Procedures for unpacking 3-2

4-2

3-24

2-16

INDEX 3

Redundancy 3-15 Repeater statistics 3-23 Repeaters 2-5

full hop 2-8 returning products for repair B-6 RJ-45 connector pinouts A-5

Securing cable connector 3-13 Segments

isolated Set Alert Filter command 3-16 Set Auto Polarity command 3-17 Setting redundant links 2-15, 2-16 Show Module command 3-19 Shutdown command 3-15 Simple Network Management Protocol (SNMP)

commands SNMP. See Simple Network Management Protocol Specifications

electrical A-1

environmental A-1

general A-2

mechanical A-2 Star topology 2-2 Statistic types 3-23 Status LEDs 3-29

troubleshooting 4-2 Switchover

port redundancy

3-24

B-6

A-1

2-16

Twisted pair

Twisted pair network 2-8 Twisted pair wiring

A-6

cables connecting cables A-6 connectors A-5 redundant links 2-15

configuration rules

2-5

Unpacking procedures 3-2 Unshielded twisted pair 2-6 URL B-2

Verifying

fiber backbone LEDs and network 3-29

2-7

Workgroups 2-10 World Wide Web B-2 WWW B-2

Technical Assistance 4-3 Technical Support 4-3 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 Tie-Wrap Kits attaching 3-11 Troubleshooting

module status LED

port status LEDs 4-2

Technical Assistance 4-3

4-1

3Com Corporation LIMITED WARRANTY

For purposes of this warranty, the CoreBuilder 5000 Ethernet 36-Port 10BASE-T Module is considered an Internetworking product.

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

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

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.

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.

(1 year if not registered)

STANDARD WARRANTY 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 Ethernet 36-Port 10BASE-T Module 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

36-Port 10BASE-T Module Description

36-Port 10BASE-T Module Features and Benefits

Theory of Operation

Understanding General Network Configuration Rules

Basic Network Rules Table 2-1

■ Fiber Backbone Configuration Rules

Using Patch Panels 2-9

Using Module Workgroups

■ Workgroup Definition

Setting Redundant Links

Precautionary Procedures

Unpacking Procedures

Quick Installation 3-3

Setting DIP Switches

■ DIP Switch Features

■ Setting the DIP Switches

DIP Switch Definition Each DIP switch function is defined in the section Configuring the

Installing the Module

Before You Begin

Configuring the Module

Enable/Disable/Shutdown Ports Command

Setting Port Redundancy Command

Setting Remote Diagnostics Command

Network Selection This command provides connector-level configuration flexibility using

Assigning Connectors 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

Connecting Module Daughter Cards

Gathering Statistics 3-23

■ Gathering Statistics

Repeater Statistics

Ethernet and RMON Statistics

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 LED and Network Operation

TROUBLESHOOTING

Troubleshooting Using the Module Status LED

Troubleshooting Using the Port Status LEDs

Technical Assistance

Electrical Specifications

SPECIFICATIONS

Environmental Specifications

Mechanical Specifications

General Specifications

50-Pin Connector and Cable

Twisted Pair Connectors and Cables

■ Twisted Pair Connectors

Twisted Pair Cables Ensure the twisted pair cables used in your configuration 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