3com CoreBuilder 5000 Token Ring Media Modules User Guide

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CoreBuilder™ 5000

Token Ring Media Modules User Guide

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Document Number 17-00513-4 Published May 1997

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

Copyright © 3Com Corporation, 1997. All rights reserved. No part of this documentation may be reproduced in any form or by any means, or used to make any derivative work (such as translation, transformation, or adaptation) without permission from 3Com Corporation. Portions of this document are reproduced in whole or part with permission from third parties.

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

3Com Corporation provides this documentation without warranty of any kind, either implied or expressed, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. 3Com may make improvements or changes in the products or programs described in this documentation at any time.

UNITED STATES GOVERNMENT LEGENDS:

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

For units of the Department of Defense:

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

For civilian agencies:

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 Unpublished rights reserved under the copyright laws of the United States.

If there is any software on removable media described in this documentation, it is furnished under a license agreement included with the product as a separate document, in the hardcopy documentation, or on the removable media in a directory file named LICENSE.TXT. If you are unable to locate a copy, please contact 3Com and a copy will be sent to you.

Federal Communications Commission Notice

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

Canadian Emissions Requirements

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

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

EMC Directive Compliance

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

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

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

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

Low Voltage Directive Compliance

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

EN 60950 – Safety of Information Technology Equipment

VCCI Class 1 Compliance

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

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

Read the instructions for correct handling.

Fiber Cable Classification Notice

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

UK General Approval Statement

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

Trademarks

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

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

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

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

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

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

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

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

of Sun Microsystems, Inc.

iii

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

HOW TO USE THIS GUIDE

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

3Com Documents 4 Reference Documents 4

1 INTRODUCTION

CoreBuilder 5000 Token Ring Module Features 1-1

Port Switching 1-1 Module Switching 1-2 Automatic Ring Speed Detection 1-2 Active Port Retiming and Jitter Reduction 1-2

Reducing Internal (CoreBuilder 5000) Jitter 1-3

Reducing External (Non-CoreBuilder 5000) Jitter 1-3 Automatic Beacon Recovery 1-4 Address-to-Port Mapping 1-4

CoreBuilder 5000 Token Ring Modules 1-4

Active Per-Port Switching Media Module (6218M-ATPP) 1-5 Active Per-Module Switching Media Module (6218M-ATP) 1-7

Ring Mapping on the APM When Trunks Are Configured 1-8 Passive Media Module (6220M-TP) 1-10 Dual Fiber Repeater Module (6210M-DFR) 1-12 Jitter Attenuator Card (6200D-JA) 1-14

Where to Go From Here 1-14

2 DESIGNING AND EXPANDING THE NETWORK

Building a CoreBuilder 5000 Token Ring Network 2-2

Additional Configuration Information 2-3 Determining the Maximum Number of Stations on a Ring 2-4 Selecting Appropriate Cable Lengths 2-4

Calculating Cable Lengths (Copper Wiring) 2-4

Additional Cable and Lobe Length Recommendations 2-5 Maximum Attenuation 2-5 Signal to NEXT Ratio 2-5 Transmitter Variation 2-5

Temperature 2-6 Cabling Standards 2-6 3Com Lobe

Cable Length Recommendations 2-6 Lobe Cabling Requirements 2-7

STP Lobe Cables 2-7

UTP/Levels 3, 4, and 5 Lobe Cables 2-8

120 ohm (Screened Twisted Pair) Lobe Cables 2-8

Connection Hardware 2-9 3Com Trunk Cable Recommendations 2-9

Copper Trunk Cables 2-9

Fiber Trunk Cables 2-9 Determining Fiber Cable Lengths Using Alternate Fiber

Diameters 2-10

Using Media Filters 2-11 Configuration Examples 2-12

Traditional Backbone Ring 2-12 Collapsed Backbone Configuration 2-14

Ring 1 Description 2-16

Ring 2 Description 2-16

Ring 3 Description 2-16

Devices Internetworked in the Master Hub 2-17 Single Extended Ring Configuration 2-17

Where to Go From Here 2-18

3 INSTALLING THE MODULE

Precautionary Procedures 3-1 Quick Installation 3-2 Unpacking Procedures 3-3 Module Overview 3-4

Using Network Monitor Cards 3-4 Setting the DIP Switches 3-5 Setting the Lobe/Trunk Jumper (6218M-ATPP and 6218M-ATP) 3-9 Installing Optional Daughter Cards 3-10

Installing a Token Ring Network Monitor Card 3-10 Installing a Token Ring Jitter Attenuator Card 3-12

Installing the Module 3-14

Copper Lobe Port Connections 3-17 Copper Ring-In/Ring-Out Trunk Connections 3-17 Fiber Ring-In/Ring-Out Connections 3-18

Where to Go From Here 3-18

4 CONFIGURING THE MODULE

Configuration Overview 4-1 Before You Begin 4-2

Configuring the Modules 4-2

Setting Network Ring Speed 4-3 Selecting a Network 4-4

Assigning Modules 4-4

Assigning Ports 4-4

Enabling Ports 4-5 Enabling Beacon Recovery 4-5 Setting Beacon Threshold 4-6 Enabling Static Ring Switching 4-6 Enabling Mismatch Resolution (Passive and Active Per-Module Media

Modules Only) 4-7 Moving Rings from Module-Level to Hub-Level 4-8 Setting Port Alert Filters 4-9 Enabling Speed Detect (Passive Module Only) 4-10 Setting Module Speed Threshold (Passive Module Only) 4-11

Configuring Trunks 4-11

Trunk Enable 4-12

vii

Trunk Network Selection 4-12

Trunk Compatibility Mode 4-12 Saving the Configuration 4-13 Showing Module Configurations 4-13

Using the Show Module Command 4-14

Using the Show Port Command 4-15 Monitoring the Front Panel 4-16 LED and Network Verification 4-17

Using the CoreBuilder 5000 Controller Module to Verify LED

Operation 4-17

Using the DMM to Verify Network Connections 4-18 Where to Go From Here 4-18

5 TROUBLESHOOTING

General Troubleshooting Tips 5-2 Troubleshooting Using the Status LEDs 5-3

Troubleshooting Using the Module Status LED 5-3

Troubleshooting Using the Port Status LEDs 5-4 Troubleshooting Ring Problems 5-5

Problems Adding a New Station to an Operating Ring 5-5

Intermittent Errors on an Operating Ring 5-6

Ring Failures 5-6 Trunk Interoperability Problems 5-7 Technical Assistance 5-8 Where to Go From Here 5-8

A SPECIFICATIONS

Token Ring Active Per-Port Switching Media Module Specifications A-1 Token Ring Active Per-Module Switching Media Module

Specifications A-2 Token Ring Dual Fiber Repeater Module Specifications A-2 Token Ring Passive Media Module Specifications A-3 Token Ring Jitter Attenuator Card Specifications A-3 Twisted Pair (Copper) Connector Pinouts A-4 Active Per-Port and Active Per-Module Media Module Ring-In Port Adapter

Pinout A-5

viii

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

FIGURES

1-1 CoreBuilder 5000 Active Per-Port Switching Media Module 1-6 1-2 CoreBuilder 5000 Active Per-Module Switching Media Module 1-9 1-3 CoreBuilder 5000 Token Ring Passive Media Module 1-11 1-4 CoreBuilder 5000 Token Ring Dual Fiber Repeater Module 1-13 2-1 Traditional Backbone Configuration 2-13 2-2 Collapsed Backbone Configuration 2-15 2-3 Single Extended Ring Configuration 2-18 3-1 CoreBuilder 5000 Token Ring Module DIP Switch Locations 3-6 3-2 Active Per-Port Module and Active Per-Module Switching

Module Jumper Setting 3-9

3-3 Location of CoreBuilder 5000 Token Ring Network Monitor Cards 3-11 3-4 Installing a CoreBuilder 5000 Token Ring Jitter Attenuator Card 3-13 3-5 Installing a Media Module 3-15 3-6 Opened and Closed Module Ejectors 3-16 4-1 CoreBuilder 5000 Token Ring Network Mode 4-9

4-2 Media Module Faceplates 4-16 A-1 RJ-45 Connector Pinouts A-4 A-2 6200ADT-RI Ring-In Wire Diagram A-5

TABLES

2-1 Building a CoreBuilder 5000 Token Ring Network 2-2

2-2 Maximum Station Counts 2-4

2-3 Maximum Lobe Lengths (in Meters) 2-7

2-4 STP Network Cable Specifications 2-7

2-5 UTP Level 3 Cable Specifications 2-8

2-6 UTP Level 4 Cable Specifications 2-8

2-7 UTP Level 5 Cable Specifications 2-8

2-8 120 ohm Cable Specifications 2-9

2-9 Multimode Fiber Specifications 2-10

2-10 Alternate Fiber Diameter Distances 2-10 2-11 Fiber Optical Budget 2-10

3-1 Procedures for Completing Installation 3-2

3-2 Network Select DIP Switch Settings 3-7

3-3 DIP Switch Setting, Switches 5 through 8 3-8

4-1 CoreBuilder 5000 Compatibility Settings 4-12

4-2 ONline Compatibility Settings 4-13

4-3 Media Module LED Interpretation 4-17

5-1 Troubleshooting Using the Module Status LED 5-3

5-2 Troubleshooting Using the Port Status LEDs 5-4

xiii

HOW TO USE THIS GUIDE

This guide explains how to install and operate the 3Com CoreBuilder information on managing the module using a CoreBuilder 5000 Distributed Management Module (DMM). It also describes the Jitter Attenuator Card, which helps stabilize trunk (Ring-In/Ring-Out) connections to non-CoreBuilder 5000 rings.

Before installing or using the Token Ring Media Modules, read Chapters 1, 2, and 3 of this guide for basic installation and operating instructions.



5000 Token Ring Media Modules. This guide 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

CoreBuilder 5000 Token Ring Modules.

Chapter 2, Designing and Expanding the Network

– Shows possible network configurations using the CoreBuilder 5000 Integrated System Hub and the CoreBuilder 5000 Token Ring Modules.

Chapter 3, Installing the Module

– Provides illustrated procedures for installing CoreBuilder 5000 Token Ring Media Modules into the CoreBuilder 5000 Integrated System Hub.

Chapter 4, Configuring the Module

– Describes the network

management commands used to configure the modules. Also shows front panel LEDs and dip switches on the module.

Chapter 5, Troubleshooting

– Provides help in isolating and

correcting problems that may arise when installing or operating CoreBuilder 5000 Token Ring Media Modules.

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

contacting the 3Com

technical support organization and for accessing

other product support services.

Index

– Lists the various methods for

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

system displays the message Transmitti ng data.

Bold command string Path names Before you begin, read the

readme.txt file located in

/usr/s nm /age nts .

Text in angled brackets Italic text in braces

Capitalized text in plain brackets

Italics Text emphasis,

User-substituted identifiers

Keyboard entry by the user

document titles

In the command above, substitute <rem_name> with the name of the remote machine.Use the following command to show port details:

SHOW PORT {

Type your password and press [ENTER].

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

slot

.all} VERBOSE

Icon Notice Type Alerts you to...

Information note Important features or instructions

Caution Risk of personal safety, system damage, or loss

Warning Risk of severe personal injury

of data

INTRODUCTION

CoreBuilder 5000 Token Ring Module Features

This chapter describes the 3Com CoreBuilder Modules. For more information on the 3Com Integrated System Hub, refer to the CoreBuilder 5000 Integrated System Hub Installation and Operation Guide.

The chapter contains the following sections:

■ CoreBuilder 5000 Token Ring Module Features

■ CoreBuilder 5000 Token Ring Modules

This section describes the following CoreBuilder 5000 Token Ring Media Module features:

■ Port Switching

■ Module Switching

■ Automatic Ring Speed Detection

■ Active Port Retiming and Jitter Reduction

■ Automatic Beacon Recovery

■ Address-to-Port Mapping

™

5000 Token Ring Media

CoreBuilder 5000

Port Switching CoreBuilder 5000 Token Ring port switching modules support per-port

switching to any combination of:

■ 10 backplane (hub-wide) Token Rings

■ 11 isolated (module-level) rings

1-2 INTRODUCTION

Ports on the same module can be part of as many as 11 different rings. Using per-port switching, you can move ports (and therefore users) from ring to ring using a console attached to the hub management module or SNMP-based network management system.

Internal management features such as automatic ring speed detection ensure that newly-inserted ports do not disrupt ring operation.

Module Switching CoreBuilder 5000 Token Ring per-module switching modules can be

switched on a per-module basis to any of 10 CoreBuilder 5000 backplane rings or to one isolated ring.

Internal management features such as automatic ring speed detection ensure that newly-inserted modules do not disrupt ring operation.

Automatic Ring

Speed Detection

Active Port Retiming

and Jitter Reduction

CoreBuilder 5000 Token Ring Media Modules provide automatic ring speed detection. Automatic Ring Speed Detection is a feature that prevents a station from entering an active ring if the station is configured for a speed other than the active ring’s speed. This wrong-speed detection is implemented per port, and works automatically with speed sensing Token Ring Adapter cards.

For example, if you try to attach a station configured at 4 Mbps to an active ring configured at 16 Mbps, the CoreBuilder 5000 Token Ring circuitry prevents the station from entering the ring before the station’s wrong speed causes a beaconing interruption.

CoreBuilder 5000 Token Ring ports and modules actively retime and regenerate incoming signals, effectively increasing achievable link distances.

■ Active retiming – Allows greater cable lengths over lower-grade

cabling, and helps ensure reliable connections. For example, CoreBuilder 5000 Active Port Retiming Token Ring supports a 16 Mbps Token Ring over Level 3 UTP cable at distances of up to 100 meters.

■ Jitter attenuation – Is a feature that increases both the achievable

link distances and maximum number of stations.

CoreBuilder 5000 Token Ring Module Features 1-3

Jitter is the tendency of signalling on Token Ring networks to grow increasingly out-of-phase as the network size increases. CoreBuilder 5000 Token Ring Media Modules remedy jitter problems by:

■ Reducing Internal (CoreBuilder 5000) Jitter

■ Reducing External (Non-CoreBuilder 5000) Jitter

Reducing Internal (CoreBuilder 5000) Jitter

To minimize jitter and increase the number of stations allowed on each ring, each CoreBuilder 5000 Token Ring active port incorporates Dual Phase-Locked Loop (DPLL) circuitry.

Dual PLL minimizes accumulated jitter and phase slope on the ring, and increases the number of attached stations to 250 (190 at 4 Mbps) on each ring. To reduce jitter, DPLL uses a two-pronged approach:

■ An optimized, wide-band PLL tracks the incoming signal even in the

presence of jitter, thus allowing more margin for jitter sources.

■ A narrow-band PLL removes all fluctuations in the recovered clock

and provides a stable source to retime and retransmit the signal.

Reducing External (Non-CoreBuilder 5000) Jitter

In addition to port-level DPLLs, CoreBuilder 5000 Token Ring Media Modules support optional Jitter Attenuator daughter cards. Daughter cards reduce jitter accumulated in external, non-CoreBuilder 5000 rings, even if the rings are built from other vendor’s products.

A combination of port-level DPLLs and Jitter Attenuator daughter cards allows you to use Level 3 UTP lobe cabling to configure the following ring (using active ports):

■ 250 stations

■ 16 Mbps ring speed

■ 100 meter lobes

A major feature of reduced jitter is reliability. A network that can support 250 stations, under worst case conditions, is assured to be extremely robust and reliable when configured with 50, 75, or 125 stations.

1-4 INTRODUCTION

Automatic Beacon

Recovery

Address-to-Port

Mapping

CoreBuilder 5000 Token Ring Modules

CoreBuilder 5000 Token Rings Media Modules are equipped with:

■ Automatic, hardware-based beacon recovery on each module.

Beacon Recovery allows the modules to remove beaconing stations from both backplane (hub-wide) and isolated (module-level) rings.

■ Beacon recovery software and the CoreBuilder 5000 Beacon

Recovery ASIC, which aids in the removal of beaconing stations.

Beacon recovery functions even in the absence of a management module in the hub.

CoreBuilder 5000 Token Ring Media Modules provide accurate, hardware-based address-to-port mapping, capable of mapping multiple stations per port, even for networks that incorporate fan-out devices and MAC-less stations (for example, network analyzers).

This section describes the following modules:

■ Active Per-Port Switching Media Module (6218M-ATPP)

■ Active Per-Module Switching Media Module (6218M-ATP)

■ Passive Media Module (6220M-TP)

■ Dual Fiber Repeater Module (6210M-DFR)

■ Jitter Attenuator Card (6200D-JA)

CoreBuilder 5000 Token Ring Modules 1-5

Active Per-Port

Switching Media

Module

(6218M-ATPP)

The CoreBuilder 5000 Token Ring Active Per-Port Switching (ATPP) Media Module is a single-slot module that supports 18 active retiming lobe ports, all with port-switching capability. The module offers the following features:

■ Switchable ports 17 and 18 provide fully-repeated Ring-In/Ring-Out

ports for connection to external rings

When configuring ports 17 and 18 as trunks, cable adapter 6200ADT-RI must be connected on the port #18.

■ Active retiming on all media ports

■ Simultaneous shielded and unshielded twisted-pair cabling support

■ Simultaneous 4 and 16 Mbps Token Ring networks, when switched

to the appropriate ring speed

■ Can be switched on a per-port basis to any of 10 CoreBuilder 5000

backplane rings or 11 isolated rings

■ Accepts one optional Jitter Attenuation Card, for use with the

Ring-In/Ring-Out ports when connecting to a non-CoreBuilder 5000 RI/RO

■ Accepts a Token Ring Network Monitor Card (TR-NMC)

■ Address-to-port mapping, including multi-station ports (fan outs)

and MAC-less stations

■ Module-level, hardware-based beacon recovery

■ IEEE 802.5 compliant

■ IEEE 802.5c trunk support

■ Per-port jitter attenuation

■ Fan-out support for up to eight devices per port

■ Automatic ring speed detection

1-6 INTRODUCTION

Figure 1-1 illustrates the CoreBuilder 5000 Token Ring Active Per-Port

Switching Media Module.

MOD/STAJARIRO

1 4

Actively-retimed lobe ports

7 10 13 16

LED panel

Ports 17 and 18 configurable as Ring-In/Ring-Out ports

7/R

Figure 1-1 CoreBuilder 5000 Active Per-Port Switching Media Module

CoreBuilder 5000 Token Ring Modules 1-7

Active Per-Module

Switching Media

Module (6218M-ATP)

The CoreBuilder 5000 Token Ring Active Per-Module Switching Media Module is a single-slot module that supports 18 active retiming lobe ports. The module offers the following features:

■ Switchable ports 17 and 18 provide fully-repeated Ring-In/Ring-Out

ports for connection to external rings

When configuring ports 17 and 18 as trunks, cable adapter 6200ADT-RI must be connected on the port #18.

■ Active retiming on all media ports

■ Simultaneous shielded and unshielded twisted-pair cabling support

■ Support for either 4 or 16 Mbps Token Ring networks

■ Can be switched on a per-module basis to any of ten

CoreBuilder 5000 backplane rings or to the one isolated ring

■ Accepts one optional Jitter Attenuation Card, for use with the

optional Ring-In/Ring-Out ports when connecting to non-CoreBuilder 5000 RI/RO

■ Accepts a Token Ring Network Monitor Card (TR-NMC)

■ Address-to-port mapping, including multi-station ports (fan-outs)

and MAC-less stations

When an Active Per-Module Media Module (APM), in trunk mode only, has fan-out devices attached in the network, the address map information is not accurate for ports below the fan-out device. The address map information for the other modules is accurate.

If a fan-out device is attached to an APM and the trunks on the APM are enabled, 3Com recommends that you insert the fan-out device at the highest numbered active port.

■ Module-level, hardware-based beacon recovery

■ IEEE 802.5 compliant

■ IEEE 802.5c trunk support

■ Per-port jitter attenuation

■ Fan-out support for up to eight devices per port

■ Automatic ring speed detection

1-8 INTRODUCTION

Ring Mapping on the APM When Trunks Are Configured

Mismatch Resolution does not run when APM trunks are enabled, which may result in an incorrect ring map. When trunks are enabled, the number of entries reported on the APM is the number of ports that have phantom. Although only the active ports are listed, there may be a mismatch in the port to station mapping when fan-out or MAC-less devices are present.

When a fanout or MAC-less device is attached to an APM with trunks enabled, the address map information may be inaccurate for ports below the fanout or MAC-less device. The address map information for the other modules on the same network is accurate. If you use fanout or MAC-less devices on an APM with trunks enabled, 3Com recommends that you insert the fanout and MAC-less device at the

highest numbered active port.

CoreBuilder 5000 Token Ring Modules 1-9

Figure 1-2 illustrates the CoreBuilder 5000 Token Ring Active

Per-Module Switching Media Module.

MOD/STAJARIRO

1 4

Actively-retimed lobe ports

7 10 13 16

LED panel

Port s 17 an d 18 configurable as Ring-In/Ring-Out ports

7/R

Figure 1-2 CoreBuilder 5000 Active Per-Module Switching Media Module

1-10 INTRODUCTION

Passive Media

Module (6220M-TP)

The CoreBuilder 5000 Token Ring Passive Media Module is a single-slot module that provides 20 lobe ports per module, or up to 320 users per hub, with as many as 250 users on the same network ring.

The module has the following features:

■ Delivers a high-density passive media solution for connecting devices

to Token Ring networks.

■ Provides connections using shielded or unshielded twisted-pair

cabling (using RJ-45 connectors) on any individual module. You cannot, however, mix both wiring types on the same module.

■ Supports a variety of twisted pair cabling, UTP categories 4 or 5.

■ Supports either 4 or 16 Mbps Token Ring networks on a per-module

basis.

■ Supports fan-out devices so that you can perform address to port

mapping of up to eight end stations per port.

■ Can be switched on a per-module basis to any of ten

CoreBuilder 5000 backplane rings or to the one isolated ring.

■ Accepts a Token Ring Network Monitor Card (TR-NMC).

■ Has built-in jitter-attenuation circuitry for module level retiming.

■ Automatic ring speed detection.

■ Address-to-port mapping, including multi-station ports (fan outs)

and MAC-less stations.

■ Module-level, hardware-based beacon recovery.

CoreBuilder 5000 Token Ring Modules 1-11

Figure 1-3 illustrates the CoreBuilder 5000 Token Ring Passive Media

Module.

Passive media ports

3 6 9 12 15 18

MOD/STA12

LED panel

Figure 1-3 CoreBuilder 5000 Token Ring Passive Media Module

1-12 INTRODUCTION

Dual Fiber Repeater

Module (6210M-DFR)

The CoreBuilder 5000 Token Ring Dual Fiber Repeater (DFR) Module is a 10-port, single-slot module that supports two sets of fully repeated fiber Ring-In/Ring-Out ports. Using the CoreBuilder 5000 hub in a collapsed backbone, each DFR Module can collapse two rings from remote locations into the central hub. The module’s features are:

■ Simultaneous 4 and 16 Mbps Token Ring networks, when switched

to the appropriate ring speed

■ 10 RJ-45 actively-retimed port-switching ports for connecting devices

to Token Ring networks using shielded or unshielded twisted-pair cabling (or both types simultaneously)

■ Industry-standard ST fiber connectors, which support multimode

62.5/125 µm fiber at distances up to 2 km

■ Up to 11 individual rings per module, and can switch ports among

any of the 11 isolated or 10 backplane rings

■ Accepts two Jitter Attenuation Cards and a Token Ring Network

Monitor Card (TR-NMC)

■ Address-to-port mapping, including multi-station ports (fan-outs)

and MAC-less stations

■ Module-level, hardware-based beacon recovery

■ IEEE 802.5 compliant

■ IEEE 802.5c trunk support

■ Fan-out support for up to eight devices per port

■ Automatic ring speed detection

CoreBuilder 5000 Token Ring Modules 1-13

Figure 1-4 illustrates the CoreBuilder 5000 Token Ring Dual Fiber

Repeater Module.

MODULE STATUS

Actively-reti med lobe ports

1 3 5 7 9 RI1 RI2 JA1

4 6 8 10 RO1 RO2 JA2

LED panel

Fiber Ring-In/Ring-Out ports

Figure 1-4 CoreBuilder 5000 Token Ring Dual Fiber Repeater Module

1-14 INTRODUCTION

Jitter Attenuator

Card (6200D-JA)

The optional Jitter Attenuator Card filters excessive jitter that may accumulate in non-CoreBuilder 5000 equipment, protecting the CoreBuilder 5000 networks from unwanted jitter build-up. It is supported by all CoreBuilder 5000 modules that have Ring-In/Ring-Out connection capability (Refer to the section titled Active Port Retiming

and Jitter Reduction on page 1-2 for more information).

The card has the following features:

■ Ensures the integrity of CoreBuilder 5000 Token Ring networks by

eliminating jitter from non-CoreBuilder 5000 device signals.

■ Allows the connection to other non-CoreBuilder 5000 rings where

jitter, or Phase Slope, may have built up to unacceptable levels. This ensures error-free operation when interfacing with the CoreBuilder 5000 hub.

■ Connects to any CoreBuilder 5000 module supporting RI/RO trunk

ports

■ Configures automatically using media module-resident software to

the appropriate Ring-In or Ring-Out receive trunk, dependent on Trunk “wrap” or “unwrap” mode

Use the Jitter Attenuator Card only with modules that make direct RI/RO connections to non-CoreBuilder 5000 equipment. This saves you the expense of the jitter attenuation circuitry when connecting to other CoreBuilder 5000 rings.

Where to Go From Here

Now that you are familiar with the features and architecture of CoreBuilder 5000 Token Ring Media Modules, evaluate the environment in which you plan to use this module. Chapter 2, Designing and

Expanding the Network, lists cabling considerations and configuration

examples specific to the CoreBuilder 5000 Token Ring Media Modules in a CoreBuilder 5000 Integrated System Hub.

DESIGNING AND EXPANDING THE

NETWORK

This chapter describes the process for designing a CoreBuilder this chapter as a guide to plan your network.

This chapter contains the following sections:

■ Building a CoreBuilder 5000 Token Ring Network

■ Determining the Maximum Number of Stations on a Ring

■ Selecting Appropriate Cable Lengths

■ Using Media Filters

■ Configuration Examples

™

5000-based Token Ring network. Use the information in

2-2 DESIGNING AND EXPANDING THE NETWORK

Building a CoreBuilder 5000 Token Ring Network

Table 2-1 lists general rules for building a CoreBuilder 5000 Token Ring

network.

Table 2-1 Building a CoreBuilder 5000 Token Ring Network

Rule Definition Recommendation/Notes 1 Understand your

network.

2 Determine the

number of stations per ring and each location.

3 Determine the ring

speed of your network.

Understand the network you are developing before you begin. Understand all network components and know their physical location. If the number of stations on a ring approaches 250 (190 with 4Mbps UTP), consider creating multiple smaller rings connected with bridges and routers instead of building one large ring.

Have a written plan of your configuration, including the number of stations and their location. The maximum number of stations allowed in a single 16 Mbps ring is 250. Four Mbps rings are allowed up to 190 stations.

Consider using significantly fewer than the maximum number of stations per ring. Although the physical medium supports the specified station count, networks may experience bandwidth problems if too many stations are added to a single ring. Maximum station count means you can add stations up to the maximum limit without fear of physical layer problems disrupting the ring.

The number of stations per ring and the type of cable used help determine the speed of the network. Some configurations are more reliable on high grade cabling.

Use 4 Mbps configuration rules if you do not plan to upgrade to a 16 Mbps network. Otherwise, use 16 Mbps rules.

When designing a network, remember that individual ports on port-switching modules can operate at either 4 and 16 Mbps, as long as the speed matches the speed of the ring. This automatic speed detect feature allows you to change a station ring speed if you upgrade the adapter card, without having to change the physical wire.

Building a CoreBuilder 5000 Token Ring Network 2-3

Table 2-1 Building a CoreBuilder 5000 Token Ring Network (continued)

Rule Definition Recommendation/Notes 4 Determine the

maximum lobe and trunk cable lengths you want to use.

5 Decide upon the

best type of cable for your environment.

6 Select the

appropriate adapter cards and media filters when needed.

7 Determine whether

you need Jitter Attenuator Cards.

8 Install and verify the

cable.

This guide lists the recommended maximum lobe and trunk cable lengths in Selecting Appropriate

Cable Lengths on page 2-4.

Keep in mind that in some cases the required lobe lengths may dictate the wiring type required.

Use a cable type with the best possible transmission properties in new installations (STP, or UTP Level 4 or greater). Level 3 is supported on active modules.

CoreBuilder 5000 Token Ring products are compatible with 802.5-compliant devices. Not all media filters are the same. 3Com offers an

802.5 optimized and fully-compliant media filter. Use Jitter Attenuator cards on Media Modules

when attaching Ring In/Ring Outs to non-CoreBuilder 5000 networks (ONline System Concentrator and IBM 8230 CAU). The cards also make ring performance more reliable.

Token Ring networks do not over-emphasize a robust cabling plant because all signals pass through each cable in the network. A single bad cable can disrupt or destroy the performance of the entire Token Ring network.

Once the cabling is installed, verify the cable at both ends (hub and station) with patch cables installed. Verification at this level can expose problems in the cabling plant that were not apparent when the cable was initially installed and tested in the wall.

Additional

Configuration

Information

This information will assist you when configuring trunks on Token Ring media modules.

Unreliable network information may display when the following three configuration conditions are met:

■ You have two media modules with their trunks configured on the

same network.

■ The modules are connected by the backplane.

2-4 DESIGNING AND EXPANDING THE NETWORK

■ The modules are connected to each other by one of the RI/RO trunk

pairs.

When you try to ping stations on the two media modules, unreliable network information displays. You may not be able to pass data between the two modules. Avoid this type of configuration.

Determining the Maximum Number of Stations on a Ring

Selecting Appropriate Cable Lengths

Calculating Cable

Lengths (Copper

Wiring)

If you have followed the lobe and trunk cabling guidelines in this chapter, 3Com maximum number of stations listed in Table 2-2

Table 2-2 Maximum Station Counts

Ring Speed/Cable Type Active Ports Passive Ports

4 Mbps UTP/STP 190 250 16 Mbps UTP/STP 250 250

CoreBuilder 5000 Token Ring Modules support the

This section describes the cable lengths for CoreBuilder 5000 Token Ring Media Modules. It is divided into the following sections:

■ Calculating Cable Lengths (Copper Wiring)

■ Cabling Standards

■ 3Com Lobe Cable Length Recommendations

■ Lobe Cabling Requirements

■ 3Com Trunk Cable Recommendations

■ Determining Fiber Cable Lengths Using Alternate Fiber Diameters

This section describes considerations and assumptions you should use for determining the cable lengths recommended in this chapter.

Considerations include:

■ Maximum Attenuation

■ Signal to NEXT Ratio

■ Transmitter Variation

■ Temperature

Selecting Appropriate Cable Lengths 2-5

Additional Cable and Lobe Length Recommendations

All cable lengths are adjusted to provide adequate margin in real-time configurations. The lengths also take into account the increased tolerance to NEXT-related jitter.

The recommended lobe lengths consider any patch panels or workstation attachment cables in the lobe. Ensure all cable in a particular path is the same type (UTP or STP) to meet the cable recommendations in this chapter.

Maximum Attenuation

To comply with the 802.5 standard, ensure that the channel does not exceed a maximum attenuation of 19 dB in any configuration. The channel is the transmission path from the medium interface connector (MIC) of one transmitter to the MIC of the next receiver in line. 3Com uses 19 dB as the maximum channel attenuation when computing cable lengths.

Signal to NEXT Ratio

To reduce effective channel attenuation, maintain an adequate Signal to Near-End Crosstalk (NEXT) Ratio (SNR).

Use the SNR to calculate recommended lobe lengths (both active and passive) as suggested by the current IEEE 802.5 draft standards:

■ 13.5 dB for STP links

■ 12.0 dB for UTP links

Transmitter Variation

To calculate the recommended lengths, use transmitter variation as suggested by the latest IEEE 802.5 draft standards:

■ 3.5 dB for STP links

■ 2.0 dB for UTP links

2-6 DESIGNING AND EXPANDING THE NETWORK

Temperature

Use the following recommended cable types for the temperatures specified:

■ UTP for 20° C

■ STP for 25 ° C

Also, adjust cable lengths downward for elevated temperatures.

Cabling Standards The following sources recommend that all horizontal copper cable

runs (lobes) be limited in length to 100 meters:

■ Commercial building cabling standards, both domestic and

international (ANSI/EIA/TIA 568, TR-41 Working Groups, and International Standard IEC/ISO 11801, Generic Cabling for Information Technology)

■ Planning and Installation Guide Customer Premises Cabling to

Support Attachment of ISO 88025 Token Ring Stations

3Com Lobe

Cable Length

Recommendations

3Com supports these cabling practices and recommends customers follow these guidelines.

Cable lengths listed in this chapter are valid only with cables as defined by either the above-mentioned documents or by EIA/TIA Bulletin:

Technical Systems Bulletin, Additional Cable Specifications for Unshielded Twisted Pair Cables, TSB-36, November 1991.

The horizontal lobe distance is the length of the furthest node from the module. Use this information as follows:

1 Determine the longest lobe cable that can be included in your network. 2 Verify that all additional lobe cables are shorter than the maximum

length.

Table 2-3

identifies maximum lobe lengths for 4 Mbps and 16 Mbps networks using STP and UTP cables in a single closet configurations. The lobe cable lengths in this table support the number of stations listed in Table 2-2

Selecting Appropriate Cable Lengths 2-7

Table 2-3 Maximum Lobe Lengths (in Meters)

Ring Speed STP UTP Level 5 UTP Level 4 UTP Level 3

Active (A)/ Passive (P)

4 Mbps 800 16 Mbps 400 200 225 100 210 100 100 N/A

* With the exception of the 190 stations, which should be reduced if there are more than

25 stations with lobe lengths approaching 800 meters.

A P A P A P A P

400 425 200 425 200 250 125

Lobe Cabling

Requirements

The section describes recommended twisted pair lobe cable requirements for the following cable types:

■ STP Lobe Cables

■ UTP/Levels 3, 4, and 5 Lobe Cables

■ 120 ohm (Screened Twisted Pair) Lobe Cables

STP Lobe Cables

Use STP cable that meets the requirements defined in SP-2840: Commercial Building Telecommunications Cabling Standard

(ANSI/TIA/EIA).

To maintain the performance of a robust network design, use wiring that meets or exceeds the specifications defined in Table 2-4

Table 2-4 STP Network Cable Specifications

Characteristic 4 Mbps 16 Mbps

Impedance 135 to 165 ohm 135 to165 ohm Attenuation (dB/100 m) 2.2 dB 4.5 dB Crosstalk (dB maximum) –58 dB

40 dB

–

The attenuation listed in Ta bl e 2 - 4

applies to cables at a temperature of 25° Celsius. The use of cables in an environment with temperatures higher than 25° Celsius may result in decreased distances. Refer to the

Planning and Installation Guide for Customer Premises Cabling to Support Attachment of ISO 8802-5 Token Ring Stations for more

details.

2-8 DESIGNING AND EXPANDING THE NETWORK

UTP/Levels 3, 4, and 5 Lobe Cables

To maintain maximum performance of your network design, use wiring that meets or exceeds the specifications defined in Tables 2-5

2-7

. For additional information on UTP cable specifications, refer to the EIA/TIA Bulletin: Technical Systems Bulletin, Additional Cable Specifications for Unshielded Twisted Pair Cables, TSB-36, November 1991, Electronic Industries Association.

Table 2-5 UTP Level 3 Cable Specifications

Characteristics 4 Mbps 16 Mbps

Impedance 90 to 110 ohms 90 to 110 ohms Attenuation (dB/100 m) 5.6 dB 13.1 dB Crosstalk (dB maximum) –32 dB –23 dB

Table 2-6 UTP Level 4 Cable Specifications

Characteristics 4 Mbps 16 Mbps

Impedance 90 to 110 ohms 90 to 110 ohms Attenuation (dB/100 m) 4.3 dB 8.9 dB Crosstalk (dB maximum) –47 dB –38 dB

, 2-6, and

Table 2-7 UTP Level 5 Cable Specifications

Characteristics 4 Mbps 16 Mbps

Impedance 90 to 110 ohms 90 to 110 ohms Attenuation (dB/100 m) 4.3 dB 8.2 dB Crosstalk (dB maximum) –53 dB –44 dB

120 ohm (Screened Twisted Pair) Lobe Cables

3Com supports 120 ohm cable, often called screened twisted pair, using cable lengths recommended for Level 4 UTP cabling. When using 120 ohm wire, use only 120 ohm patch cables with 120 ohm "in the wall" wiring.

To maintain maximum performance of your network design when using the 120 ohm cable, make sure the cable meets the requirements in

Table 2-8

Selecting Appropriate Cable Lengths 2-9

Table 2-8 120 ohm Cable Specifications

Characteristics 4 Mbps 16 Mbps

Impedance 120 ohms 120 ohms Attenuation (dB/100 m) 3.5 dB 6.2 dB NEXT Attenuation, max 46 dB 38 dB

Connection Hardware

The performance of installed cable only meets the specifications listed when your connection hardware level is greater than or equal to the level of the installed cable. Connector hardware is specified in SP-2840:

Commercial Building Telecommunications Cabling Standard

(ANSI/TIA/EIA) and EIA/TIA TSB-40.

3Com Trunk Cable

Recommendations

CoreBuilder 5000 Token Ring products have either copper or fiber trunk (Ring-In/Ring-Out) ports. This section lists trunk cabling requirements for:

■ Copper Trunk Cables

■ Fiber Trunk Cables

Copper Trunk Cables

Connect copper trunk ports using Unshielded Twisted Pair (UTP) 3, 4, or 5 and Shielded Twisted Pair (STP). The distances are the same as the active lobe port distances. (Refer to Table 2-3

for trunk cable lengths.) However, for the highest integrity, use only STP and UTP 5 for connecting trunks.

When configuring ports 17 and 18 as trunks, cable adapter 6200ADT-RI must be connected on port #18.

Fiber Trunk Cables

Ensure that fiber-optic trunk cables are:

■ Multimode

■ Grade-index optical fiber waveguide with nominal 62.5/125 µM

core/cladding diameter

2-10 DESIGNING AND EXPANDING THE NETWORK

The fiber must comply with the specifications listed in Ta b l e 2 -9 and with ANSI/EIA/TIA - 492AAAA. You can use cables of this type up to 2 km long.

Table 2-9 Multimode Fiber Specifications

Determining Fiber

Cable Lengths Using

Alternate Fiber

Diameters

Maximum

Wavelength

850 3.75 dB/km 160

Table 2-10

Attenuation

contains distance estimates that may not have been tested.

Maximum into Transmission Capacity (MHz-km)

Use the alternate fiber diameter distances listed to help you determine the fiber cable length associated with the use of alternate fibers. The result is based on 62.5/125 (the defacto cable that you use). By specification, the maximum distance for any fiber length is 2 kilometers.

Table 2-10 Alternate Fiber Diameter Distances

Alternate Diameter Fiber Size

50/125 -16.4 to -22.4 -12 to -28 0

62.5/125 -13 to -19 -12 to -28 0 85/125 -10.7 to 16.7 -12 to -28 100/140 - 8.8 to -14.8 -12 to -28* 4

* If you use 85/125 or 100/140 as your alternate fiber diameter distance, you can overdrive

the receiver.

Average Transmit Power (dBm)

Receiver Power Range (dBm)

Minimum Link Loss Required (db)

1.3

Table 2-11 Fiber Optical Budget

50 Micron Core 85 Micron Core 100 Micron Core

920 meters 3.44 km 5.3 km

Using Media Filters 2-11

Using Media Filters 3Com Token Ring products do not require media filters.

You may, however, need to use a media filter when attaching a DTE device, only when the installed cable’s impedance does not match the Network Interface Card’s (NIC) impedance. For example, you may try to use UTP wiring (100 ohm impedance) with NIC cards that have STP (150 ohm) output.

If you have a NIC that requires a media filter, we recommend the 3Com media filter (5201F-UTP), which exceeds IEEE specifications for return loss, and provides robust performance with most NICs. Using other media filters may cause excessive attenuation or other loss, thereby reducing achievable link distances and reducing maximum station counts.

2-12 DESIGNING AND EXPANDING THE NETWORK

Configuration Examples

Traditional Backbone

Ring

This section describes typical applications in using CoreBuilder 5000 Token Ring modules. The following example configurations are described:

■ Traditional Backbone Ring

■ Collapsed Backbone Configuration

■ Single Extended Ring Configuration

The traditional backbone ring configuration assumes:

1 Each floor or department in an organization forms its own Token Ring

LAN.

2 A bridge connects each LAN to a backbone ring, thereby allowing

communication between users on different LANs.

3 The backbone ring extends through the riser of the building through

the CoreBuilder 5000 Dual Fiber Repeater Modules.

In the traditional backbone ring scenario, the CoreBuilder 5000 Dual Fiber Repeater Modules are interconnected through their Ring-In/Ring-Out ports. The following conditions exist:

■ All Repeater Modules are assigned to the same backplane ring or

are set to isolated mode.

■ For each separate LAN, the Token Ring Bridges and Token Ring

Media Modules (in this case, CoreBuilder 5000 Token Ring Passive Media Modules) are assigned to the same backplane ring.

■ Each Token Ring Bridge connects to a Repeater Module through a

connection from the bridge to one of the 10-lobe ports on the Repeater Module.

Configuration Examples 2-13

Figure 2-1 illustrates a backbone ring connecting three

CoreBuilder 5000 hubs on different floors of a building.

Bridge

Backbone

Bridge

Figure 2-1 Traditional Backbone Configuration

2-14 DESIGNING AND EXPANDING THE NETWORK

Collapsed Backbone

Configuration

Networks that use a collapsed backbone result in:

■ Reduced costs

■ Enhanced security

■ Controlled access to networking equipment

■ Centralize major networking devices (such as file servers, protocol

analyzers, bridges, and routers) in one controlled area such as a computer room

Figure 2-2

illustrates the following configuration:

1 A master CoreBuilder 5000 hub is located in the central computer

room on floor 1 of a 3-story building.

2 The CoreBuilder 5000 hubs on floors 2 and 3 both contain

CoreBuilder 5000 Dual Fiber Repeater modules that connect through the vertical riser of the building to two CoreBuilder 5000 Dual Fiber Repeater modules in the master concentrator.

3 Traffic sent by the departmental LANs travels directly to the master hub. 4 A single Dual Fiber Repeater module extends both Ring 1 and Ring 2 to

the master hub. Ring 1 and Ring 2 users exist on each Active Per-Port Switching Module in the third floor hub.

Configuration Examples 2-15

A description of each ring assignment follows Figure 2-2.

TR-NMC

T-JIT

Floor 3

Floor 2

TR-NMC

IBM 8230

TR-NMC

T-JIT

= Installed Daughter Cards

Ring 1

Ring 2

Ring 3

Monitoring Ring 4

Floor 1

Bridge/R outer

Ring 1

Figure 2-2 Collapsed Backbone Configuration

Ring 2

Servers

Ring 4

Minicomputer

Ring 3

2-16 DESIGNING AND EXPANDING THE NETWORK

This section describes the ring assignments illustrated in Figure 2-2.

Ring 1 Description

The end nodes on Ring 1 attach to Active Per Port Switching Modules in the floor 3 hub. The following is a list of assignments for Ring 1:

■ Each port on Ring 1 is assigned to the CoreBuilder 5000 hub’s

backplane Token Ring 1 network.

■ A set of Ring-In/Ring-Out ports, also assigned to backplane Token

Ring 1, extends the ring through the vertical riser to the master hub on floor 1.

■ The attached Ring-In/Ring-Out ports on the Dual Fiber Repeater

Module on floor 1 are assigned to the same backplane network as the server for Ring 1. This connects the Ring 1 file server to the Ring 1 end nodes.

Ring 2 Description

Ring 2 works the same way Ring 1 works. Ring 2 uses the second set of Ring-In/Ring-Out ports on the Dual Fiber Repeater Module on the third floor to extend the ring down the vertical riser.

The Ring 2 file server is attached to the same Active Per Port Switching Media Module as the Ring 1 file server. This is possible because you can switch any port on either the Dual Fiber Repeater Module or the Active Per-Port Switching Module to any of 10 backplane Token Ring networks.

Ring 3 Description

Ring 3 works the same way as Rings 1 and 2.

The second set of Ring-In/Ring-Out ports on the Dual Fiber Repeater Module on floor 2 attach an IBM 8230 Multistation Access Unit (MAU) to the ring. A Token Ring Jitter Attenuator Card installed on the Dual Fiber Repeater Module ensures compatibility with the external 8230 MAU.

Configuration Examples 2-17

Devices Internetworked in the Master Hub

In the master (floor 1) hub, port-switching lobe ports on the Dual Fiber Repeater Module connect four of the hub’s backplane Token Ring networks to an external bridge/router. The external bridge/router:

■ Routes traffic between the three networks that service file servers

and the nodes on the building’s floors

■ Communicates across the backplane to a fourth Token Ring network

that attaches to a minicomputer (for example, a database server)

Because all of the ports in this internetwork are port-switchable, the internetwork is easily organized into four subnetworks, which are connected by routing traffic through a multiport external bridge/router.

Single Extended

Ring Configuration

The single extended ring configuration:

■ Connects users on distant points of a network to one extended local

area network.

■ Accommodates organizations that have users dispersed in different

areas of a building and want them configured into one Token Ring LAN.

Dual Fiber Repeater Modules provide main trunk connectivity between distant CoreBuilder 5000 hubs.

Figure 2-3

shows an extended ring that spans several hubs in a building. The Token Ring Passive Media Modules in each hub on floor 1 and floor 2 are configured on the same backplane ring (in this case, all modules are assigned to Ring 1). Assign the Dual Fiber Repeater and Passive Media Modules to the same backplane ring in both hubs so that a single data path is used for data transmission.

2-18 DESIGNING AND EXPANDING THE NETWORK

Floor 3

Floor 2

Where to Go From Here

Floor 1

Figure 2-3 Single Extended Ring Configuration

Once you complete this chapter, proceed to Chapter 3. Chapter 3, Installing the Module, describes installation procedures for CoreBuilder 5000 Token Ring Media Modules and optional daughter cards and how to set DIP switches.

INSTALLING THE MODULE

This chapter describes the installation of CoreBuilder™ 5000 Token Ring Media Modules.

For your convenience, a module reference card is included with each module. These cards list management commands, LED indicators, and other module information. Store this card in the CoreBuilder 5000 Integrated System Hub binder in the Reference Card area.

This chapter contains the following topics:

■ Precautionary Procedures

■ Quick Installation

■ Unpacking Procedures

■ Module Overview

Precautionary Procedures

■ Setting the DIP Switches

■ Installing Optional Daughter Cards

■ Installing the Module

CAUTION: Read the precautionary procedures in this chapter before unpacking the module.

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

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

CAUTION: Handle the board by the faceplate only.

3-2 INSTALLING THE MODULE

Use one of the following proper grounding techniques when you install the module:

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

discharge wrist strap.

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

handle the module.

Quick Installation Table 3-1 outlines the steps necessary to complete 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 Procedures for Completing Installation

Step Procedure Section Title 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 in Chapter 4.

4 Set the lobe/trunk selection jumper (Model

Numbers 6218M-ATPP and 6218M-ATP).

5 Install Token Ring Network Monitor Cards

or Jitter Attenuator Cards as needed.

6 Enter the SHOW POWER*command at the

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

7 Insert the module into an open slot in the

hub and fasten the ejectors and tighten the faceplate screws fingertight. Use proper ESD precautionary procedures when handling the module.

Chapter 2, Designing and

Expanding the Network

Procedures

Chapter 3, Setting the DIP

Switches or Chapter 4, Configuring the Module

Chapter 3, Setting the

Lobe/Trunk Jumper (6218M-ATPP and 6218M-ATP)

Chapter 3, Installing

Optional Daughter Cards

Chapter 3, Installing the

Module

Chapter 3, Installing the

Module

Unpacking Procedures 3-3

Table 3-1 Procedures for Completing Installation (continued)

Step Procedure Section Title

8 Establish connections from the module to

9 Verify LED status for normal operation. Chapter 4, LED and

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

devices using the appropriate connectors and cabling. Chapter 2, Designing and Expanding the Network, describes cabling limitations.

more details on hub power requirements.

Chapter 3, Installing the

Module

Network Verification

For information about potential problems, consult the troubleshooting techniques in Chapter 5

Unpacking Procedures

To unpack your module:

1 Verify that the module 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 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 module by the faceplate, being careful not to touch

the components. If the module appears to be damaged, return it to the antistatic shielding bag, repack it in the shipping carton, and contact your local supplier.

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

Record the serial number of your module. The Hub Planning Charts, located in the CoreBuilder 5000 reference binder, are provided for this purpose.

3-4 INSTALLING THE MODULE

Module Overview Token Ring Media Modules are either port-switching or

module-switching. These features:

■ Enable you to assign either a port or the entire module to a

backplane (hub-wide) or isolated (module-level) network.

■ Provide you with greater flexibility in both workgroup creation and

module configuration.

Using Network Monitor Cards

The CoreBuilder 5000 scalable network management architecture enables users to add a CoreBuilder 5000 Token Ring Network Monitor Card (TR NMC) to the module. This card enables users to achieve SNMP network connectivity and gather network statistics for any of the CoreBuilder 5000 Token Ring backplane networks, as well as for any individual isolated (module-level) network.

Once you attach the card to a module, you must assign the TR NMC card to the network you want to have inband connections to or gather statistics on. On module-switched modules, the TR NMC is automatically assigned to the same network that the media card is assigned to.

You can install the TR NMC card on Token Ring Media Modules only. The Distributed Management Module (DMM) does not provide installation slots for these cards.

Setting the DIP Switches 3-5

Setting the DIP Switches

Each Token Ring Media Module has an 8-position DIP switch.

All of the DIP switch settings on the module are ignored if an appropriate CoreBuilder 5000 network management module (DMM 2.0 or later, for example) is already installed in the hub (or if you configure the module to configure from NVRAM). For this reason, use network management commands, rather than the DIP switch, to configure the module.

Use the DIP switches to:

■ Select a network channel for each port on the module (the default

is TR1).

■ Choose the configuration approach used in hubs, either:

■ Non-volatile RAM configuration (software configuration) or

■ DIP Segment selection (DIP-specified module configuration). The

default is configuration from NVRAM. When the module configures from its NVRAM settings, the module ignores all hardware DIP settings and uses its last-stored software configuration.

■ Set whether or not the module uses a Speed Detect algorithm

(Passive Module only. Other modules detect speed automatically). The default is disable.

■ Set a ring speed for the module. The default is 16 Mbps.

It is not possible to use the DIP switches on Token Ring Media Modules to assign individual ports to different networks.

If you do not have a CoreBuilder 5000 network management module installed in your hub, your hub’s configuration defaults to the DIP switch settings on the module. The DIP switch 5 setting may instruct the module to configure from NVRAM. You must set ports 17 and 18 with a jumper.

If you are using a management module and do not plan to use the DIP configuration command, skip setting the DIP switches and go to the section titled "Installing the Module"

in this chapter. Figure 3-1 provides an illustration of the switch location on each Token Ring Media Module.

3-6 INSTALLING THE MODULE

Active Per-Port Switching Module Dual Fiber Repeater Module

DIP switch

OFF

SW1

sw2

sw3

sw4

sw5

sw6

sw7

sw8

DIP switch

OFF

SW1 sw2 sw3 sw4 sw5 sw6 sw7 sw8

Passive Module

Active Per-Module Switching Module

Figure 3-1 CoreBuilder 5000 Token Ring Module DIP Switch Locations

Setting the DIP Switches 3-7

Table 3-2 and Table 3-3 describe the DIP switch settings as follows:

■ Table 3-2 describes the switches used for selecting a default network

connection. Switches 1 through 4 enable users to configure all ports for one of the backplane segments (token_ring_1 through token_ring_10) or as a module-level ring (isolated).

■ Table 3-3 describes the remaining DIP settings.

A complete definition of each DIP switch function appears in Chapter 4

Table 3-2 Network Select DIP Switch Settings

Switch Settings

Network Selection

1 (default) ON OFF OFF OFF 2 OFF ON OFF OFF 3 ON ON OFF OFF 4 OFF OFF ON OFF 5 ON OFF ON OFF 6 OFF ON ON OFF 7 ON ON ON OFF 8 OFF OFF OFF ON 9 ON OFF OFF ON 10 OFF ON OFF ON

isolated

* Any combination of settings that does not match a specific backplane network causes the

module to be isolated.

Switch 1 Switch 2 Switch 3 Switch 4

OFF OFF OFF OFF

3-8 INSTALLING THE MODULE

Table 3-3 DIP Switch Setting, Switches 5 through 8

Switch Number

5 ON configures modules from NVRAM.

6 ON disables the Passive Media Module’s speed detection algorithm.

7 Not Used 8 ON sets the ring speed to 4 Mbps.

Definition

OFF configures the module from DIP settings. By default, Switch 5 is set to ON.

Not Used by other Token Ring Media Modules. The default is ON.

OFF sets the ring speed to 16 Mbps. Default is 16 Mbps.

When a module is first installed, the hub checks for configuration settings in the management module. The hub checks for configuration settings stored in NVRAM. If, however, there are no configuration settings in NVRAM, or DIP Switch 5 is set to DIP-switch controlled configuration and the DMM command SET DEVICE DIP_CONFIG is set to ENABLE, the hub checks the DIP switches for configuration information.

Setting the Lobe/Trunk Jumper (6218M-ATPP and 6218M-ATP) 3-9

Setting the Lobe/Trunk Jumper (6218M-ATPP and 6218M-ATP)

On-board jumpers determine whether ports 17 and 18 on the module are lobe ports or Ring-In/Ring-Out ports. Setting the jumper to the:

■ Left – Selects Ring-In/Ring-Out

■ Right – Selects lobe ports

Use pliers or a screwdriver to carefully pry off the jumper.

Ports 17 and 18 do not function when you remove the jumper entirely. When configuring ports 17 and 18 as trunks, cable adapter 6200ADT-RI must be connected on the port #18.

Jumper block

JP3 JP4 JP5 JP6 JP7

RIRO

LOBE

Figure 3-2 Active Per-Port Module and Active Per-Module Switching Module Jumper Setting

3-10 INSTALLING THE MODULE

Installing Optional Daughter Cards

Installing a Token

Ring Network

Monitor Card

CoreBuilder 5000 Token Ring Media Modules support two types of optional daughter cards:

■ Token Ring Network Monitor Cards – Provide the management

system with network connectivity and monitor network statistics

■ Token Ring Jitter Attenuator – Removes jitter coming into the

CoreBuilder 5000 hub.

To install a TR NMC on a CoreBuilder 5000 Token Ring Media Module (Figure 3-3

1 Match the TR NMC 50-pin connector to the corresponding connector

on the host CoreBuilder 5000 Token Ring Media Module. Make sure that the screws align with the holes on the standoffs on the media module.

2 Seat the NMC connector onto the media module connector. 3 Secure the NMC to the media module. Tighten the screws down into

the standoffs opposite the connector shown in Figure 3-3

. Do not

over-tighten the screws.

Figure 3-3

illustrates the location of Network Monitor Cards. The location of the Token Ring Monitor Card is relative to the position of the TR NMC 50-pin connector on the Token Ring Module.

Connector

Installing Optional Daughter Cards 3-11

Active Per-Port Switching Module

Network Monitor Card

Dual Fiber Repeater Module

Orientation

Connector

OFF

SW1 sw2 sw3 sw4 sw5 sw6 sw7 sw8

Passive Module

Active Per-Module Switching Module

Figure 3-3 Location of CoreBuilder 5000 Token Ring Network Monitor Cards

3-12 INSTALLING THE MODULE

Installing a Token

Ring Jitter

Attenuator Card

Only use the Jitter Attenuator Card with modules that make direct RI/RO connections to non-CoreBuilder 5000 equipment. Each media module is capable of carrying a Jitter Attenuator card for each set of Ring In/Ring Out ports:

■ Dual Fiber Repeater Module – Supports two jitter attenuator

cards

■ Active Per-Port Media and Active Per-Module Media Module –

Support one card

Designed with a 30-pin connector, the Jitter Attenuator Card is easily user-installable, and cannot inadvertently be placed on the Token Ring Network Monitor Card connectors.

To install a Jitter Attenuator Card on a CoreBuilder 5000 Token Ring Media Module:

1 Match the card’s connector pins to the corresponding pins on the host

CoreBuilder 5000 Token Ring Media Module. Make sure that the standoffs align with the holes on the card.

2 Seat the card’s connector onto the module’s connector. 3 Secure the card to the media module by tightening the two screws on

each end of the board (see Figure 3-4

). Be careful not to over-tighten.

CAUTION: The Passive Media Module is shipped with a factory-installed Jitter Attenuator Card. Do not remove this card. The module does not function without it.

Figure 3-4

shows the typical orientation of a Jitter Attenuator Card in relation to the socket and standoffs on CoreBuilder 5000 Token Ring Modules.

Figure 3-4

illustrates the location of a second Jitter Attenuator Card on the Dual Fiber Repeater Module.

Installing Optional Daughter Cards 3-13

OFF

SW1

sw2

sw3

sw4

sw5

sw6

sw7

sw8

Standoffs

Connector

Standoffs

Connector

Jitter

Active Per-Port Switching Module Dual Fiber Repeater Module

Attenuator Card Orientation

(relative to the standoffs and connector)

OFF

SW1 sw2 sw3 sw4 sw5 sw6 sw7 sw8

Standoffs Connector

Standoffs

Connector

Passive Module

Active Per-Module Switching Module

Figure 3-4 Installing a CoreBuilder 5000 Token Ring Jitter Attenuator Card

3-14 INSTALLING THE MODULE

Installing the Module

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

or remove media modules. You can insert the module

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

To install a media module:

1 Properly ground yourself prior to handling the media module.

For example, attach a static wrist guard to yourself or touch a grounded static mat prior to handling them media module.

2 Configure the media module as follows:

■ To install the media module in a managed hub (DMM Version 2.0 or

later), go to step 3 to complete the installation. To configure the appropriate settings, go to Chapter 4, Configuring the Module

■ To insert the media module in an unmanaged hub, configure the

DIP switch settings on the module to the desired settings (refer to

"Setting the DIP Switches"

earlier in this chapter) and go to step 4.

3 Determine if the hub has enough power for the new module by

entering the SHOW POWER BUDGET command. Refer to Appendix A, Specifications, for detailed information on the power for each watt type.

Refer to the Distributed Management Module Commands Guide for information on the SHOW POWER BUDGET command.

4 Locate an open slot in the hub. To expose a slot for the module,

remove the blank panel on the hub.

Installing the Module 3-15

5 Insert (see the arrow in Figure 3-5) 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 3-5

shows the

installation of the module.

Figure 3-5 Installing a Media Module

3-16 INSTALLING THE MODULE

6 Close the media module ejectors (Figure 3-6).

Half-hei ght leve l

Apply pressure here

Opened position

Closed position

Figure 3-6 Opened and Closed Module Ejectors

7 Fasten the spring-loaded screws on the front of the media module

faceplate to the hub using your fingers (do not over-tighten).

Installing the Module 3-17

Copper Lobe Port

Connections

Copper

Ring-In/Ring-Out

Trunk Connections

Copper lobe ports are designed to connect to end stations. They cannot be used to interconnect modules. See Chapter 2, Designing and

Expanding the Network, for wiring specifications.

When connecting Ring-In/Ring-Out ports to a non-CoreBuilder 5000 ring, for example, ONline System Concentrator, IBM 8230 CAU, install a Jitter Attenuator Daughter Card.

To connect Ring-In/Ring-Out ports:

1 Attach one end of the twisted pair cable (STP-type only) to the copper

Ring-Out port.

2 Attach the other end to a copper Ring-In port on the second module. 3 Interconnect any remaining modules using each module's

Ring-In/Ring-Out ports. To form a full ring, be sure to make connections using both the copper Ring-In and Ring-Out ports.

When you configure ports 17 and 18 on the active per-port module or the active per-module media module as RI/RO, install cable adapter 6200ADT-RI on the Ring-In port, port #18, which crosses over the RX/TX wires in the cable. See Appendix A, Figure A-2

, for a pinout

diagram.

To provide maximum fault tolerance for multivendor configurations:

■ Ensure that the local ring starts and ends with the copper Ring-In

and Ring-Out ports.

■ Set the correct compatibility mode using the SET TRUNK {slot}

{RING_IN/RING_OUT} COMPATIBILITY_MODE command.

3-18 INSTALLING THE MODULE

Fiber

Ring-In/Ring-Out

Connections

In a typical configuration, Dual Fiber Repeater Modules in separate wiring closets are connected to the trunk ring through the fiber Ring-In and Ring-Out ports. Refer to Chapter 2

for fiber trunk cable

specifications.

To establish a fiber Ring In/Ring Out connection:

When connecting Ring-In/Ring-Out ports to a non-CoreBuilder 5000 ring (ONline System Concentrator, IBM 8230 CAU), install a Jitter Attenuator Daughter Card for the associated trunk ports to ensure interoperability.

1 Remove the plastic fiber covers from the cable ports that will be used.

Keep the unused cable ports capped to keep the optics clean.

2 Before installing, make certain all cables have been properly cleaned

with an appropriate fiber optic cleaning solution.

3 Attach the fiber cables to the fiber ports on the front panel of the

module. Make sure the transmit and receive cables are:

■ Clearly marked or color coded

■ Connected to the appropriate ports on the module (for example,

the fiber Ring-In receive is connected to a fiber Ring-Out transmit)

Where to Go From Here

Do not exceed the bend radius for the fiber cable when directing the cables under the hub. Refer to the cable manufacturer's specifications for minimum bend radius.

4 Attach the other end of the cable to another Token Ring fiber trunk

port. Make sure the transmit fiber at one end of the cable is always connected to a receive port at the other end.

5 If connecting to an ONline System Concentrator or IBM 8230, issue the

SET TRUNK {slot} {RING_IN/RING_OUT} COMPATIBILITY_MODE command from the DMM in the CoreBuilder 5000 hub to ensure compatibility.

Once you complete this chapter, go to Chapter 4. Chapter 4, Configuring the Module, describes how to configure CoreBuilder 5000 Token Ring Media Modules using management commands.

CONFIGURING THE MODULE

This chapter describes how to configure CoreBuilder™ 5000 Token Ring Media Modules.

This chapter contains the following sections:

■ Configuring the Modules

■ Configuring Trunks

■ Saving the Configuration

■ Showing Module Configurations

■ Monitoring the Front Panel

■ LED and Network Verification

For additional information on network management commands described in this section, refer to the CoreBuilder 5000 Distributed

Management Module Commands Guide.

Configuration

Overview

CoreBuilder 5000 network management modules provide network management for the CoreBuilder 5000 Integrated System Hub and its modules. If you are using a Distributed Management Module (DMM), the DIP switch settings on the media module are ignored (unless you set up the DMM to configure the module from DIP switches). For this reason, use network management commands, rather than the DIP switches, to configure the module.

4-2 CONFIGURING THE MODULE

Before You Begin If a Management Module is present when you first install the module,

the network defaults to isolated mode and the ports are automatically disabled (so that users cannot join the network undetected by network management). Therefore, you must enable the ports you wish to use and set the module ports to the appropriate network using management commands. Upon initial installation of the module, it is useful to set certain parameters before proceeding further.

After installation, perform the following network management commands to configure the media module:

■ Setting Network Ring Speed

■ Selecting a Network

■ Enabling Ports

■ Enabling Beacon Recovery

■ Enabling Static Ring Switching

■ Enabling Mismatch Resolution (Passive and Active Per-Module

Media Modules Only)

Configuring the Modules

■ Moving Rings from Module-Level to Hub-Level

■ Setting Port Alert Filters

■ Enabling Speed Detect (Passive Module Only)

■ Setting Module Speed Threshold (Passive Module Only)

For additional information on any network management command described in this section, refer to the CoreBuilder 5000 Distributed Management Commands Guide.

This section describes network management commands to help you configure CoreBuilder 5000 Token Ring Media Modules for your environment.

This section contains the following information:

■ Setting Network Ring Speed

■ Selecting a Network

■ Enabling Ports

■ Enabling Beacon Recovery

Configuring the Modules 4-3

■ Setting Beacon Threshold

■ Enabling Static Ring Switching

■ Enabling Mismatch Resolution (Passive and Active Per-Module

Media Modules Only)

■ Moving Rings from Module-Level to Hub-Level

■ Setting Port Alert Filters

■ Enabling Speed Detect (Passive Module Only)

■ Setting Module Speed Threshold (Passive Module Only)

Setting Network Ring

Speed

CB5000> set network to ken_ring token_ri ng_4 ring_sp eed 16mbp s Value set to 16 Mbps.

Use the SET NETWORK TOKEN_RING RING_SPEED command to set the ring speed of a specified network. Any module, port, trunk, or daughter card assigned to the network is automatically set to the speed of the network.

The command sequence is:

SET NETWORK TOKEN_RING {network} RING_SPEED {4_MBP}

{16_MBPS}

Where:

network = token_ring_1 to token_ring_10

isolated_1 {slot} - isolated _11 {slot}

The following command sets the ring speed for backplane network token_ring_4 to 16 Mbps:

4-4 CONFIGURING THE MODULE

Selecting a Network CoreBuilder 5000 media modules provide module-level or port-level

configuration flexibility using the CoreBuilder 5000 hub's unique architecture.

This section describes how to assign (collectively or individually) the following to any of 10 backplane networks (or up to 11 isolated module segments):

■ Assigning Modules

■ Assigning Ports

Refer to the CoreBuilder 5000 Integrated System Hub Installation and Operation Guide, Chapter 1, Introduction for a complete discussion of

the CoreBuilder 5000 hub architecture.

Assigning Modules

The DIP switch settings on the media module assign all ports (collectively) on the module to network 1 through 10 or to an isolated segment. Network management, however, assigns one or more ports to a network. If you have a CoreBuilder 5000 TR NMC, Network Management also assigns the NMC to a network.

The following command assigns a module or submodule to a network:

SETMODULE{

slot.subslot

} NETWORK {token_ring_1.._10}

{iso lated _1 ..._ 11 } {isolat ed }

The CoreBuilder 5000 TR NMC Card is automatically configured as subslot 2 on the media module. The default setting, subslot 1, refers to the media module.

Assigning Ports

For modules that support port switching, the following network management command assigns a port to a network:

SET PORT {

slot.port

} N ET WORK {token_ring_1.._10}

{isolated_1..._11}

Configuring the Modules 4-5

Use the SET PORT NETWORK command to assign users to backplane (hub-level) segments or isolated (module-level) segments. For instance, to create a module-level ring, you must assign all of the users in the group to one isolated network (for example, ISOLATED_1).

Enabling Ports Use the SET PORT MODE command to enable or disable each of the

ports on the media module. When a port is enabled, it can transmit to and receive data from the network to which the module port is assigned.

The command sequence is:

Enabling Beacon

Recovery

SET PORT

{

slot.port

{

slot

.all}

} MODE {enable} {disable}

Use the SET PORT command to disable a port (port 2 on the module in slot 6):

set por t 6.2 mode disable

Use the SET NETWORK TOKEN_RING BCN_RECOVERY command to enable or disable the beacon recovery mechanism on a CoreBuilder 5000 network. The default is enabled.

The command sequence is:

SET NETWORK TOKEN_RING {network} BCN_RECOVERY {mode}

Where:

network = token_ring_1 - token_ring_10

isolated slot isolated_1 slot - isolated _11 slot

mode = enable

disable

The following command enables the beacon recovery mechanism for backplane network token_ring_3:

CB5000> set network to ken_ring token_ri ng_3 bcn_rec overy enable Value set to ENABLED.

4-6 CONFIGURING THE MODULE

Statistics are not accurate on a beaconing ring. To correct this condition, resolve beaconing and then clear all statistics. This is normal operation.

Setting Beacon

Threshold

Use the SET MODULE BCN_THRESHOLD to set the number of times that a phantom transition, caused by a beaconing condition, is allowed to cause a port or trunk to unwrap before the port or trunk is removed from the ring.

The command sequence is:

SET MODULE {slot}.1 BCN_THRESHOLD {threshold}

Where:

{slot}.1 = module 1 to 17, subslot 1 {threshold} = 0 to 255 phantom transitions

The following command sets the beacon threshold of the Active Per Port Module in slot 7 to a maximum of 7. If this threshold is exceeded for a port or trunk, that port or trunk is removed from the ring:

CB5000> set module 7.1 bcn_thre shold 7 [ENT ER] Thresh old set to 7.

The default value for Set Beacon Threshold is 7. A value of 0 (zero) means infinite, therefore you will never reach the maximum threshold value.

Enabling Static Ring

Switching

Use the SET PORT STATIC_SWITCH to:

■ Force users to power down a station before switching rings or

networks. This forces the station to perform a duplicate address test before

entering a new ring.

■ Prevent ports from being switched from one ring to another when a

phantom is present.

This command applies only to port switching modules.

Configuring the Modules 4-7

The command sequence is:

SET PORT {slot}.{port} STATIC_SWITCH {setting}

Where:

{slot} = hub slot 1 to 17 {port} = 1 to 24 or all {setting} = disable

enable

The following command disables static switch on port 2 on the module in slot 6:

CB5000> set port 6.2 s tatic_swi tch disable [ENTER] Port 6. 02 set to D ISABLED.

The default is enable, forcing the users to power off the station to switch rings.

Enabling Mismatch Resolution (Passive

and Active

Per-Module Media

Modules Only)

Use the SET NETWORK TOKEN_RING MISMATCH_RESOLUTION command to:

■ Enable the mismatch resolution algorithm for the specified network.

■ Perform address-to-port mapping when you use a splitter or

fan-out device on a CoreBuilder 5000 Token Ring port.

The default is disable.

The command sequence is:

SET NETWORK TOKEN_RING {network} MISMATCH_RESOLUTION {mode}

Where:

network = token_ring_1 - token_ring_10

isolated slot isolated_1 slot - isolated _11 slot

mode = enable

disable

4-8 CONFIGURING THE MODULE

Example: The following command enables the mismatch resolution mechanism

on backplane network token_ring_3:

CB5000> set network to ken_ring token_ri ng_3 mismatch_re solution enable Value set to ENABLED.

Moving Rings from

Module-Level to

Hub-Level

Use SET NETWORK TOKEN_RING MODE command to toggle entire rings between isolated (module-level) and backplane (hub-wide) Token Ring networks. This command is valid for port-switched modules only. This setting is saved automatically and is not affected by the SAVE or REVERT commands. This command affects only the specified slot and cannot be used to isolate every module in the hub.

You can implement each of the 10 available token rings on CoreBuilder 5000 port-switching media modules either on a backplane (hub-wide) or an isolated (module-level) network. Use this command to toggle sets of ports between backplane and isolated. You may only toggle rings 1 through 10.

You specify a slot number when indicating the isolated network the command affects. The command only affects the specified slot and cannot be used to isolate each module in the hub.

The command sequence is:

SET NETWORK TOKEN_RING {network} MODE BACKPLANE

ISOLATED {slot}

Where:

network = token_ring_1 to token_ring_10

isolated_1 {slot} - isolated _11 {slot}

ISOLATED {slot} = identifies the isolated network the command affects

Example: The following command assigns all ports assigned to isolated_3

(module-level ring) in module 7 to token_ring_3 (backplane ring):

CB5000> set network to ken_ring isolated _3 7 mode b ackplane

Configuring the Modules 4-9

AAAA

AAA

If you enter the command shown in the previous example, all ports assigned to network isolated_3 join backplane network token_ring_3 (Figure 4-1

Setting Port Alert

Filters

Figure 4-1 CoreBuilder 5000 Token Ring Network Mode

Use the SET ALERT PORT ALERT_FILTER command to enable or disable port up and port down trap generation for a specific port. This command works in conjunction with the SET ALERT (PORT_UP_DOWN_FILTER) command.

Once the SET PORT ALERT_FILTER command has been enabled for a port, you must issue the SET ALERT PORT_UP_DOWN_FILTER command to allow or prevent port up and port down traps to be transmitted from the DMM to the designated trap receiver. The DMM sends a port_up_down trap whenever a port on the stack starts operating (goes up) or stops operating (goes down). If you disable the port_up_down alerts, the DMM does not generate the alerts. If you enable the port_up_down alerts, the DMM generates alerts for all ports in the hub.

4-10 CONFIGURING THE MODULE

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

Enabling Speed

Detect (Passive

Module Only)

SET PORT {

slot.port

{

slot.

all} { disa ble}

} AL ERT _FIL TE R {enab le}

The following command sets alert filter on port 1 of a module in slot 1:

CB5000> set port 1.1 alert_ filter en able [ENTER] Port 01 .01 Alert Filter set to ENABLE.

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

Use the SET PORT SPEED_DETECT command to prevent stations from inserting into a ring at the incorrect speed. When an incorrect speed station is detected, the port is wrapped and the status is set to SPEED MISMATCH. The port or trunk unwraps when a transition of phantom is detected, or when the user disables and then re-enables the port or trunk. The default is disable.

The command sequence is:

SET PORT {slot}.{port} SPEED_DETECT {setting}

Where:

{slot} = hub slot 1 to 17 {port} = 1 to 20

all

{setting} = enable

disable

Example: The following command enables speed detect on port 1 of the Passive

Media Module in slot 7:

CB5000> set port 7.1 s peed_detect enable [ENTER] Port 07 .01 Speed Detection se t to ENABL ED.

Configuring Trunks 4-11

Setting Module

Speed Threshold

(Passive Module

Only)

Example: The following command sets the speed threshold of the module in slot

Use the SET MODULE SPEED_THRESHOLD command to set the number of times that a phantom transition caused by a ring speed mismatch is allowed to cause a port to unwrap before the port is removed from the ring. This command applies to the CoreBuilder 5000 Passive Token Ring Media Module (Model Number 6220M-TP). Use the Set Port Speed Detect command to enable speed detection. The default is 7.

The command sequence is:

SET MODULE {slot}.1 SPEED_THRESHOLD {threshold}

Where:

{slot}.1 = module 1 to 17, subslot 1 {threshold} = 0 to 255 phantom transitions

To reset this threshold, disable and re-enable the port from the management console.

7 to a maximum of 7. If this threshold is exceeded for a port or trunk, that port or trunk is removed from the ring:

CB5000> set module 7.1 speed_th reshold 7 [E NTER] Thresh old set to 7.

The default Threshold is 7. A value of 0 (zero) means infinite, therefore you will never reach maximum threshold value.

Configuring Trunks Use the SET TRUNK command to configure the following options for

either copper or fiber trunk ports:

■ Trunk Enable

■ Trunk Network Selection

■ Trunk Compatibility Mode

You must install a Jitter Attenuator Card on any module that connects to a non-CoreBuilder 5000 network.

4-12 CONFIGURING THE MODULE

Trunk Enable

Use the SET TRUNK MODE command to enable or disable CoreBuilder 5000 Token Ring trunk ports. The command sequence is:

SET TRUNK {slot} ring_in. { 1 or 2} MODE {enable}

ring_out. { 1 or 2} {disable}

Trunk Network Selection

Use the SET TRUNK NETWORK command to set a trunk port to a particular backplane or isolated network. The command sequence is:

SET TRUNK {slot} ring_in. {1 or 2} NETWORK {token_ring_1..._10}

ring_out. {1 or 2} {isolated_1..._11}

Trunk Compatibility Mode

Use the SET TRUNK RING_IN/RING_OUT COMPATIBILITY_MODE command to ensure that the signalling used by a CoreBuilder 5000 trunk port is compatible with the trunk port connected at the other end of the copper or fiber cable.

Table 4-1

shows the compatibility settings to use when connecting a

CoreBuilder 5000 trunk port:

Table 4-1 CoreBuilder 5000 Compatibility Settings

To Connect CoreBuilder 5000 Modules to: Set Compatibility Mode to:

CoreBuilder 5000 modules CoreBuilder 5000 ONline System Concentrator ONline ONline 5204M-CR ONsemble ONsemble ONsemble IBM® 8250 T04MS-CR 8238 IBM 8238 Token Ring Stackable Hub 8238 IBM 8230 CAU 8230 IBM 8228 MAU 8230 IBM 8250 Multiprotocol Intelligent Hub 8250 IBM 8260 Multiprotocol Intelligent Switching Hub 8260

Saving the Configuration 4-13

For reference, Table 4-2 shows the compatibility settings to use when connecting an ONline module trunk port:

Table 4-2 ONline Compatibility Settings

To Connect ONline to: Set Compatibility Mode to:

ONline Disable CoreBuilder 5000 Disable IBM 8230 CAU Enable

The command sequence for the trunk compatibility mode is:

Where: {slot} = slot containing the trunk port

Saving the Configuration

Showing Module Configurations

SET TRUNK{

slot

} ring_in.{1 or 2} COMPATIBILITY_MODE {

ring_out.{1 or 2}

mode

}

{mode} = disable, enable, CoreBuilder 5000, ONline, 8230, 8260, 8250

After you make configuration changes to a module and ports, you must issue the SAVE MODULE_PORT command to save the new settings.

CAUTION: Failure to save module settings may cause you to lose configuration data.

You can display status information about the media module using the following network management commands:

■ SHOW MODULE

■ SHOW MODULE VERBOSE

■ SHOW PORT

■ SHOW PORT VERBOSE

These commands are explained in the following sections.

4-14 CONFIGURING THE MODULE

Using the Show

Module Command

Example:

CB5000 > Show modu le 5.1 verbo se

Slot Module Ver sion Network General Inform ation

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

05.01 6 220M-TP 1 .00.0 TOKEN_ RING_1

6220M-TP: CB5000 Token Rin g Passive Module Sw itching Twisted Pair Module

Boot Versio n: 1.00.0 Ring Speed D IP Setting : 16 MBPS DIP Network Setting: ISOLATED Non-Volatil e DIP Sett ing: DISABL ED Recovery Asic Primary Address: 52-41-50-4d-41-43 Recovery Asic Secondary Address: 52-41-53-4d-41-43 Beacon Threshold : 7 Speed D etect Threshold: 7

The SHOW MODULE command enables you to display both brief and verbose information about a particular module. The command sequence is:

SHOW MODULE {sl ot .sub sl ot} {ver bo se}

{

slot.

all} {no_ver bo se }

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

Showing Module Configurations 4-15

Using the Show Port

Command

Example:

CB5000 > show port 7.all verbo se

Port Di splay for Module 6218M -ATPP :

Port Mode St atus Ne twork Genera l Information

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

07.01 E NABLED NO PHANTOM TOKEN_ RING_1 Port is d own

Port Al ert Filter : DISABL ED Port Co nnector: RJ45S DIP Net work Setti ng: ISOLAT ED_11 Static Switch: DISABL ED

07.02 E NABLED NO PHANTOM TOKEN_ RING_1 Port is d own

Port Al ert Filter : DISABL ED Port Co nnector: RJ45S DIP Net work Setti ng: ISOLAT ED_11 Static Switch: DISABL ED

Port Mo de Status Netw ork Gen eral Infor mation

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

07.03 E NABLED NO PHANTOM TOKEN_ RING_1 Port is d own

Port Al ert Filter : DISABL ED Port Co nnector: RJ45S DIP Net work Setti ng: ISOLAT ED_11 Static Switch: DISABL ED

The SHOW PORT command enables you to display both brief and verbose information on both individual ports and all ports collectively. The command sequence is:

SHOW PORT {

slot.port

{

slot.

all} {no_ verbo se }

} {verbose}

The following output is an example of the SHOW PORT ALL VERBOSE command issued for a media module installed in slot 7 (only the output for ports 1, 2, and 3 are shown):

4-16 CONFIGURING THE MODULE

Monitoring the Front Panel

The LEDs on the front panel of the media module allow you to monitor the status of each port. Each media module has a Status LED for each port. Figure 4-2 state of a port as described in Table 4-3

MOD/STAJARIRO

1 4 7

shows the location of the LEDs. Each LED indicates the

MODULE STATUS

MOD/STAJARIRO

1 4 7

MOD/STA12

3 6

9 12 15 18

JA1

10 RO1

RI1

RO2

RI2

JA2

Active Per-Port Switching Module

Active Per-Module Switching Module

Figure 4-2 Media Module Faceplates

Pass i ve Media Module

Dual Fiber Repeater Mo d ule

LED and Network Verification 4-17

Table 4-3 Media Module LED Interpretation

LED Name Color State Indicates

Module Status Green OFF No power.

Blinking Module failed self diagnostics.

ON Module powered up OK. Ring-In/ Ring-Out

(RI/RO) LEDs

Port Status Green ON Port enabled, phantom detected, port

Jitter Attenuator Card (JA, JA1, JA2)

RI/RO (ATPP, ATP)

Green OFF Trunk disabled.

ON Trunk enabled and operating.

Blinking Trunk enabled, but not operating.

enabled onto ring, status OK. 1 blink Port enabled, no phantom. OFF Port disabled.

Green OFF Card not installed.

ON Card installed and operating normally.

Green OFF Ports 17 and 18 are lobe ports.

ON Ports 17 and 18 Trunk (RI/RO) ports.

LED and Network Verification

Using the

CoreBuilder 5000

Controller Module

to Verify LED

Operation

This section provides information on LED and Network verification information for the media module. The following topics are discussed:

■ Using the CoreBuilder 5000 Controller Module to Verify LED

Operation

■ Using the DMM to Verify Network Connections

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

The CoreBuilder 5000 hub's controller module is equipped with an LED Test button on the front panel. Use the LED Test button to verify LED operation. When you press this button, the module initiates a test to all modules in the hub. All LEDs should respond by lighting continuously for approximately five seconds. Any LED that does not light is defective. This test does not disrupt network operation.

4-18 CONFIGURING THE MODULE

Using the DMM to

Verify Network

Connections

Where to Go From Here

The DMM enables you to verify each network connection (both active and isolated) for all CoreBuilder 5000 modules and NMC cards installed in your hub. To initiate the verification process:

1 Press the Display Control Toggle button on the front of the module. 2 Observe as the DMM sequentially cycles through each network

connection (Ethernet, Token Ring, then FDDI) and lights each status LED associated with the network indicated on the DMM LCD display.

All isolated networks (1 through 11) light at the same time, rather than one by one.

Once you complete this chapter, proceed to Chapter 5. Chapter 5, Troubleshooting, describes troubleshooting procedures for CoreBuilder 5000 Token Ring Modules.

If you have problems configuring or installing your media module, refer to Chapter 5

prior to contacting customer support.

TROUBLESHOOTING

This chapter describes troubleshooting procedures for the CoreBuilder may assist you in verifying the module's operation.

This chapter is divided into the following parts:

■ General Troubleshooting Tips

■ Troubleshooting Using the Status LEDs

■ Troubleshooting Ring Problems

■ Trunk Interoperability Problems

■ Technical Assistance

™

5000 Token Ring Module. Information on troubleshooting

5-2 TROUBLESHOOTING

General Troubleshooting Tips

Improper configuration of a module may cause unexpected results. The LEDs on the module provide a good indication of errors. Troubleshooting using the port and module LEDs is described later in this chapter. If you experience a problem with your module, you should also verify that:

■ All cabling and connection hardware meets the specifications

outlined in Chapter 2

■ Any attaching device or station is set to the same ring speed as the

of this guide

network that the port (port-switching media modules) or module (module-switching media modules) is assigned to.

■ Only STP cabling, or Level 4 or 5 UTP cabling, used on the copper

Ring-In/Ring-Out ports

■ Fiber cabling connects properly (that is, transmit always connects

directly to receive)

■ Fiber Ring-In port connects to a fiber Ring-Out port

■ Fiber ports on the module are used to connect only to other

CoreBuilder 5000 devices, ONline devices, or to an IBM 8230 Controlled Access Unit (CAU)

■ Jitter Attenuator Card is attached to Ring-In/Ring-Out ports that

connect to non-CoreBuilder 5000 equipment

■ Trunk compatibility mode settings on 3Com devices are set as

described in Chapter 4

of this guide

Troubleshooting Using the Status LEDs 5-3

Troubleshooting Using the Status LEDs

Troubleshooting

Using the Module

Status LED

In certain situations, the status LEDs may not light. This section describes the following:

■ Troubleshooting Using the Module Status LED

■ Troubleshooting Using the Port Status LEDs

Table 5-1 outlines possible causes and some solutions for

troubleshooting the Module Status LED.

Table 5-1 Troubleshooting Using the Module Status LED

LED State

OFF Hub power is off Check the controller module power

Possible Cause Corrective Action

LEDs.

The module or slot is faulty Try a different module.

Remove and re-insert the module.

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

Use the SHOW POWER BUDGET management command to ascertain available power in the hub (see the

Distributed Management Module Commands Guide for more

information).

5-4 TROUBLESHOOTING

Troubleshooting

Using the Port

Status LEDs

Table 5-2

outlines possible causes and some solutions for troubleshooting the Port Status LEDs. A blinking Port Status indicator signals a problem with a port or link connected to a port.

Table 5-2 Troubleshooting Using the Port Status LEDs

LED State

1 blink Port enabled, but

OFF Port disabled Port disabled. Enable port.

Indication Possible Cause Corrective Action

Station not powered. Turn on the PC or other no station is detected (phantom current is not detected).

Faulty cable. Replace the cable

No cable connected

to station.

Station speed does

not match the

network speed.

Station not inserted

on ring.

Module not

receiving power.

Power management

system has powered

down slot.

Broken LED. Press the LED check

Faulty module. Replace module.

connected.

Disable the port.

Check the speed of the station and network. Make sure the speeds match.

Run your software application to cause the Token Ring end station to insert onto the ring.

Check the controller module power LEDs.

Check hub power management settings (see the DMM User Guide for more information).

button on the controller module.

Troubleshooting Ring Problems 5-5

Troubleshooting Ring Problems

Problems Adding a

New Station to an

Operating Ring

This section provides remedies for problems you could encounter when working with Token Ring Networks.

Problems may arise when using the lobe ports to add a new station to an operating ring. The station does not initialize properly on the ring, and reports that it has failed diagnostic testing. Problems of this type are generally traced to horizontal cabling that attaches the station to the hub.

To resolve a ’failed diagnostic’ ring problem:

1 Verify that the port is enabled on the module that the failing station is

attached to. If the front panel LED corresponding to this port is:

■ On or blinking, go to step 2.

■ Off, the port is disabled. Enable the port to allow the station to

attach to the ring.

2 Verify that the station adapter card is set to the same ring speed as the

hub port.

3 Verify the presence of the DC phantom current generated by the

station when requesting attachment to the ring.

■ Observe the front panel LED of the port connected to the failing

station. The LED should be blinking when no cable is attached, or when the station has not yet requested attachment to the ring.

■ Once the station attaches to the ring, the LED should be on

continuously. If the LED does not stay on continuously, the station is not requesting attachment or is unable to attach to the ring.

■ Check the cabling and confirm that the station is operating

properly.

4 Verify that the cables being used to connect the station to the hub are

secure. Be sure not to exceed the maximum lobe cable distances recommended in Chapter 2 attaching cables meets the requirements described in Appendix A

. Also, verify that the pinout of the

If the adapter is set for the incorrect speed, the station may report that it has inserted itself on the ring, even though the module has prevented the station from inserting.

5-6 TROUBLESHOOTING

Intermittent Errors

on an Operating Ring

Ring Failures In some situations, an operating ring may fail. However, the ring wraps

An operating ring may experience occasional soft errors. This occurrence is normal in Token Ring devices. Usually, these errors are caused by stations removing themselves from and inserting themselves on the ring. A low soft-error level does not affect network performance.

The following error types are reported by stations:

■ Line

■ Burst

■ Lost token or frame

Rings that exhibit continual soft errors, particularly in the absence of insertion and removal activity, may be suffering from:

■ Excessive noise or jitter

■ Facility wiring

■ Devices that do not meet specifications

to the backup path and continues operation. If a module fails, it removes itself off of the backplane and the remainder of the ring continues to operate.

This may be reported by stations as “Ring Beaconing”, or stations may simply fail to attach to the ring. Module beacon recovery isolates virtually all faults in the data path.

Ring failure usually indicates:

■ Problems in the trunk cabling

■ Ring speed has been incorrectly set for the module

To resolve a ring failure:

1 Verify that all Ring-In/Ring-Out cables are connected. A broken

Ring-In/Ring-Out copper cable can cause the ring to fail, particularly when attached to other vendors’ equipment.

2 Verify that any other devices in the trunk path (for example, repeaters)

are operating properly.

Trunk Interoperability Problems 5-7

3 If the trunk ring appears to be operating, the problem source may

reside at higher software layers. If your network is based around a single file server, problems in the server or its network attachment can cause the ring to fail.

Trunk Interoperability Problems

If your trunk connections to CoreBuilder 5000 Token Ring Modules are not operating properly, check each of the following and ensure that you:

1 Have set each end of the connection to the proper compatibility mode

(see Chapter 4

for more information).

2 Install a jitter attenuator card on the CoreBuilder 5000 module if

connecting to a non-CoreBuilder 5000 ring.

3 Only connect CoreBuilder 5000 fiber trunks to 3Com ONline System

Concentrator, 3Com CoreBuilder 5000 hub, IBM 8250 hub, IBM 8260 hub, or IBM 8230 CAU trunk ports. The JA LED on the module should light.

4 Check that all cabling used meets the specifications outlined in

Chapter 2

5 Check that the fiber cabling is connected properly (that is, transmit

always connects directly to receive).

6 If using the Ring-In/Ring-Out ports on an Active Per-Port Media

Module or an Active Per-Module Media Module, make sure that you either:

■ Install cable adapter 6200ADT-RI on the Ring-In port, which crosses

over the RX/TX wires in the cable.

■ Use a cable on the Ring-In port that crosses over the RX/TX

connections. See Appendix A, Figure A-1

, for a pinout diagram.

7 When trunk ports are enabled, check that the jumpers for the trunks

are set properly.

5-8 TROUBLESHOOTING

Technical Assistance

Where to Go From Here

You can receive assistance for installing and troubleshooting the Token Ring Media 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 network management module

being used

■ Version of software installed on your CoreBuilder 5000 Token Ring

Media Module

■ Status of the front panel LEDs

■ Configuration of your hub

(you may find it helpful to refer to the Hub Planning Chart in the CoreBuilder 5000 Reference Library for a record of this information)

If you complete this chapter and are still unable to ascertain the cause of a particular problem with your module, contact 3Com Customer Support and provide them with the specific nature of your problem. Refer to Appendix B

for information on contacting 3Com Technical

Support.

SPECIFICATIONS

This appendix lists specifications for the Token Ring Media Modules. The module specifications included are:

■ Token Ring Active Per-Port Switching Media Module Specifications

■ Token Ring Active Per-Module Switching Media Module

Specifications

■ Token Ring Dual Fiber Repeater Module Specifications

■ Token Ring Passive Media Module Specifications

■ Token Ring Jitter Attenuator Card Specifications

■ Twisted Pair (Copper) Connector Pinouts

■ Active Per-Port and Active Per-Module Media Module Ring-In Port

Adapter Pinout

Token Ring Active Per-Port Switching Media Module Specifications

Data Rate 4 and 16 Mbps Connectors Shielded RJ-45 (pinout appears later in this

appendix)

Cable Requirements Supports UTP, STP, and 120 ohm Cabling

Power Requirements 38 w +5 V DC, 0.5 w +12 V DC Mechanical Occupies 1 Slot Daughter Card Support 1 Jitter Attenuator Daughter Card

Environmental

Operating Temperature

Humidity

BTUs/hr

Systems

1 Token Ring Network Monitor Card

0° to 50° C (32° to 122°F) Less than 95%, noncondensing

131.4

A-2 SPECIFICATIONS

Token Ring Active Per-Module Switching Media Module Specifications

Token Ring Dual Fiber Repeater Module Specifications

Data Rate 4 and 16 Mbps Connectors Shielded RJ-45 (pinout appears later in this

appendix)

Cable Requirements Supports UTP, STP, and 120 ohm Cabling

Systems

Power Requirements 28 w +5 V DC, 0.5 w +12 V DC Mechanical Occupies 1 Slot Daughter Card Support 1 Jitter Attenuator Daughter Card

1 Token Ring Network Monitor Card

Environmental

Operating Temperature

Humidity

BTUs/hr

Connectors Shielded RJ-45, ST Fiber Optic Data Rate 4 and 16 Mbps Cable Requirements Supports UTP, STP, and 120 ohm Cabling

Power Requirements 37 w +5 V DC, 0.5 w +12 V DC,

Mechanical Occupies 1 Slot Daughter Card Support 2 Jitter Attenuator Daughter Cards

Environmental

Operating Temperature

Humidity

BTUs/hr

0° to 50° C (32° to 122°F) Less than 95%, noncondensing

96.9

Systems Supports Fiber 62.5/125 µm, 50/125 µm, 85/125

µm, 100/140 µm

and 0.25 w -12 V DC

1 Token Ring Network Monitor Card

0° to 50° C (32° to 122°F) Less than 95%, noncondensing

128.8

Token Ring Passive Media Module Specifications

Token Ring Passive Media Module Specifications A-3

Fiber Transmitter Light Source: LED at wavelength 850 nm

Transmit Power: -13 to -19 dBm average

Fiber Receiver

Fiber Connectors ST-type

Connectors Shielded RJ-45 Data Rate 4 and 16 Mbps Cable Requirements Supports UTP, STP, and 120 ohm Cabling

Power Requirements 16 w +5 V DC, 1.5 w +12 V DC, and 1.25 w -12

Mechanical Occupies One Slot Daughter Card Support 1 Token Ring Network Monitor Card

Environmental

Operating Temperature

Humidity

BTUs/hr

Light Detector: Silicon PIN photodiode Input Range: Optical power input of -12 to -28 dBm Dynamic Range: 16 dBm Bit Error Rate: 1 in 10

Systems

V DC

0° to 50° C (32° to 122°F) Less than 95%, noncondensing 64

-10

over dynamic range

Token Ring Jitter Attenuator Card Specifications

Connectors 30-pin connector Power Requirements 1 w +5 V DC, 1 w +12 V DC, and

0.5 w -12 V DC

Environmental

Operating Temperature

Humidity

BTUs/hr Mechanical 2.5” x 5” (6.35 cm x 12.7 cm)

0° to 50° C (32° to 122°) Less than 95%, noncondensing

8.5

A-4 SPECIFICATIONS

Twisted Pair (Copper) Connector Pinouts

You must use the IEEE 802.5 Token Ring standard for pinouts. The following cable standard must be used for an 8-pin connector. Token Ring uses 2 pairs of wire: pins 3 & 6 and pins 4 & 5 (see Figure A-1

). If you do not configure the pairs this way, the connection does not work properly. Ensure an 8-pin connector on datagrade 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 (not used)

■ pins 7 and 8 are pair 4 (not used)

Station Transmit

Not Used Not Used

12 435678

W-G G W-O BL

Station Receive

W-BL

O W-BR BR

Hub Transmit

Jack Positions

Hub Receive

Figure A-1 RJ-45 Connector Pinouts

Active Per-Port and Active Per-Module Media Module Ring-In Port Adapter Pinout A-5

Active Per-Port and Active Per-Module Media Module Ring-In Port Adapter Pinout

You do not need to refer to this wiring diagram if you use cable adapter 6200ADT-RI.

Use the wiring diagram below (Figure A-2

) to create a device that imitates the function the optional ring-in port adapter when you do not plan to use cable adapter 6200ADT-RI.

Figure A-2 6200ADT-RI Ring-In Wire Diagram

3com CoreBuilder 5000 Token Ring Media Modules 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 The following documents provide additional information on 3Com

Reference Documents The following documents supply related background information:

INTRODUCTION

CoreBuilder 5000 Token Ring Module Features

■ Port Switching

Module Switching CoreBuilder 5000 Token Ring per-module switching modules can be

Reducing Internal (CoreBuilder 5000) Jitter

Reducing External (Non-CoreBuilder 5000) Jitter

CoreBuilder 5000 Token Ring Modules

Where to Go From Here

Building a CoreBuilder 5000 Token Ring Network

Selecting Appropriate Cable Lengths

■ Calculating Cable Lengths (Copper Wiring)

Additional Cable and Lobe Length Recommendations

Maximum Attenuation

Signal to NEXT Ratio

Transmitter Variation

Temperature

Cabling Standards The following sources recommend that all horizontal copper cable

STP Lobe Cables

UTP/Levels 3, 4, and 5 Lobe Cables

120 ohm (Screened Twisted Pair) Lobe Cables

Connection Hardware

Copper Trunk Cables

Fiber Trunk Cables

Using Media Filters 2-11

Configuration Examples

■ Traditional Backbone Ring

Ring 1 Description

Ring 2 Description

Ring 3 Description

Devices Internetworked in the Master Hub

Where to Go From Here

Precautionary Procedures

■ Installing the Module

Quick Installation Table 3-1 outlines the steps necessary to complete the installation of

Unpacking Procedures

Module Overview Token Ring Media Modules are either port-switching or

Using Network Monitor Cards

Setting the DIP Switches

Installing Optional Daughter Cards

Installing the Module

Where to Go From Here

CONFIGURING THE MODULE

Before You Begin If a Management Module is present when you first install the module,

Configuring the Modules

Selecting a Network CoreBuilder 5000 media modules provide module-level or port-level

Assigning Modules

Assigning Ports

Enabling Ports Use the SET PORT MODE command to enable or disable each of the

Configuring Trunks 4-11

Trunk Enable

Trunk Network Selection

Trunk Compatibility Mode

Saving the Configuration

Showing Module Configurations

Monitoring the Front Panel

LED and Network Verification

Where to Go From Here

TROUBLESHOOTING

General Troubleshooting Tips

Troubleshooting Using the Status LEDs

■ Troubleshooting Using the Module Status LED

Table 5-2 Troubleshooting Using the Port Status LEDs

Troubleshooting Ring Problems

Ring Failures In some situations, an operating ring may fail. However, the ring wraps

Trunk Interoperability Problems

Technical Assistance