3com CoreBuilder 5000 Token Ring Media Modules User Guide

CoreBuilder™ 5000

Token Ring Media Modules User Guide

http://www.3com.com/

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 Unpublished rights reserved under the copyright laws of the United States.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

+ 84 hidden pages

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