®
http://www.3com.com/
CoreBuilder™ 5000
Token Ring Media Modules
User Guide
Document Number 17-00513-4
Published May 1997
ii
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Unpublished rights reserved under the copyright laws of the United States.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
iii
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.
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iv
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CONTENTS
HOW TO USE THIS GUIDE
Audience 1
Structure of This Guide 2
Document Conventions 3
Related Documents 3
3Com Documents 4
Reference Documents 4
1INTRODUCTION
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
vi
2DESIGNING 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
vii
3INSTALLING 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
4CONFIGURING 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
viii
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
5TROUBLESHOOTING
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
ASPECIFICATIONS
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
ix
BTECHNICAL 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
xi
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
xiii
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
HOW TO USE THIS GUIDE
This guide explains how to install and operate the 3Com
CoreBuilder5000 Token Ring Media Modules. This guide includes
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.
Audience This guide is intended for the following people at your site:
■Network manager or administrator
■Hardware installer
2HOW 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 – Lists the various methods for
contacting the 3Com® technical support organization and for accessing
other product support services.
Index
Document Conventions 3
Document
Conventions
The following document conventions are used in this manual
:
Related Documents This section provides information on supporting documentation,
including:
■3Com Documents
■Reference Documents
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
Transmitting data.
Bold command string Path names Before you begin, read the
readme.txt file located in
/usr/snm/agents.
Text in angled
brackets Italic text in
braces
User-substituted
identifiers In the command above, substitute
<rem_name> with the name of
the remote machine.Use the
following command to show port
details:
SHOW PORT {
slot
.all} VERBOSE
Capitalized text in plain
brackets Keyboard entry by
the user Type your password and press
[ENTER].
Italics Text emphasis,
document titles Ensure that you press the Apply
button after you add the new
search parameters.
Icon Notice Type Alerts you to...
Information note Important features or instructions
Caution Risk of personal safety, system damage, or loss
of data
Warning Risk of severe personal injury
4HOW TO USE THIS GUIDE
3Com Documents The following documents provide additional information on 3Com
products:
CoreBuilder 5000 Integrated System Hub Installation and Operation
Guide – Provides information on the installation, operation, and
configuration of the CoreBuilder 5000 Integrated System Hub. This
guide also describes the principal features of the CoreBuilder 5000
Fault-Tolerant Controller Module.
Distributed Management Module User Guide – Provides information
on the CoreBuilder 5000 Distributed Management Module’s operation,
installation, and configuration. This guide also describes the software
commands associated with the Distributed Management Module.
Distributed Management Module Commands Guide – Describes each
management command by providing detailed information on the
command’s format, use, and description.
Token Ring Media Module Quick Reference Cards – Provide basic
configuration and monitoring information for individual CoreBuilder
5000 Token Ring module types.
For a complete list of 3Com documents, contact your 3Com
representative.
Reference Documents The following documents supply related background information:
Case, J., Fedor, M., Scoffstall, M., and J. Davin, The Simple Network
Management Protocol, RFC 1157, University of Tennessee at Knoxville,
Performance Systems International and the MIT Laboratory for
Computer Science, May 1990.
Rose, M., and K. McCloghrie, Structure and Identification of
Management Information for TCP/IP-based Internets, RFC 1155,
Performance Systems International and Hughes LAN Systems, May
1990.
1INTRODUCTION
This chapter describes the 3Com CoreBuilder™ 5000 Token Ring Media
Modules. For more information on the 3Com® CoreBuilder 5000
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
CoreBuilder 5000
Token Ring
Module Features
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
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
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.
Active Port Retiming
and Jitter Reduction
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
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.
Address-to-Port
Mapping
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).
CoreBuilder 5000
Token Ring
Modules
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.
Figure 1-1 CoreBuilder 5000 Active Per-Port Switching Media Module
LED pane l
Actively-ret im ed
lobe ports
Ports 17 and 18
configurable as
Ring-In/Ring-Out ports
18/R1
17/RO
1
4
7
10
13
16
MOD/STA
JA
RIRO
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.
Figure 1-2 CoreBuilder 5000 Active Per-Module Switching Media Module
LED panel
Actively-retimed
lobe ports
P orts 1 7 and 1 8
configurable as
Ring-In/Ring-Out ports
18/R1
17/RO
1
4
7
10
13
16
MOD/STA
JA
RIRO
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.
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.
Figure 1-4 CoreBuilder 5000 Token Ring Dual Fiber Repeater Module
LED pane l
Activel y-retim ed
lobe ports
Fiber Ring-In/Ring-Out
ports
1
3
5
7
9
RI1
RI2
JA1
MODULE
STATUS
2
4
6
8
10
RO1
RO2
JA2
TX
RX
TX
RX
TX
RX
TX
RX
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RI-2
RO-1
RI-1
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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.
2DESIGNING AND EXPANDING THE
NETWORK
This chapter describes the process for designing a
CoreBuilder™5000-based Token Ring network. Use the information in
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
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
1Understand 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.
2Determine the
number of stations
per ring and each
location.
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.
3Determine the ring
speed of your
network.
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
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.
4Determine the
maximum lobe and
trunk cable lengths
you want to use.
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.
5Decide upon the
best type of cable
for your
environment.
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.
6Select the
appropriate adapter
cards and media
filters when needed.
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.
7Determine whether
you need Jitter
Attenuator Cards.
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.
8Install and verify the
cable. 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.
Table 2-1 Building a CoreBuilder 5000 Token Ring Network (continued)
Rule Definition Recommendation/Notes
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
If you have followed the lobe and trunk cabling guidelines in this
chapter, 3Com® CoreBuilder 5000 Token Ring Modules support the
maximum number of stations listed in Table 2-2.
Selecting
Appropriate Cable
Lengths
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
Calculating Cable
Lengths (Copper
Wiring)
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
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
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 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.
3Com Lobe
Cable Length
Recommendations
The horizontal lobe distance is the length of the furthest node from the
module. Use this information as follows:
1Determine the longest lobe cable that can be included in your network.
2Verify 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
* With the exception of the 190 stations, which should be reduced if there are more than
25 stations with lobe lengths approaching 800 meters.
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.
The attenuation listed in Ta b le 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.
Table 2-3 Maximum Lobe Lengths (in Meters)
Ring Speed STP UTP Level 5 UTP Level 4 UTP Level 3
Active (A)/
Passive (P) A P A P A P A P
4 Mbps 800*400 425 200 425 200 250 125
16 Mbps 400 200 225 100 210 100 100 N/A
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
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, 2-6, and
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.
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.
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
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
Selecting Appropriate Cable Lengths 2-9
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
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
2-10 DESIGNING AND EXPANDING THE NETWORK
The fiber must comply with the specifications listed in Tab le 2-9 and
with ANSI/EIA/TIA - 492AAAA. You can use cables of this type up to
2 km long.
Determining Fiber
Cable Lengths Using
Alternate Fiber
Diameters
Table 2-10 contains distance estimates that may not have been tested.
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.
* If you use 85/125 or 100/140 as your alternate fiber diameter distance, you can overdrive
the receiver.
Table 2-9 Multimode Fiber Specifications
Wavelength
Maximum
Attenuation
Maximum into Transmission Capacity
(MHz-km)
850 3.75 dB/km 160
Table 2-10 Alternate Fiber Diameter Distances
Alternate
Diameter Fiber
Size
Average Transmit
Power (dBm)
Receiver Power
Range (dBm)
Minimum Link
Loss Required
(db)
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*1.3
100/140 - 8.8 to -14.8 -12 to -28* 4
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
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
Traditional Backbone
Ring
The traditional backbone ring configuration assumes:
1Each floor or department in an organization forms its own Token Ring
LAN.
2A bridge connects each LAN to a backbone ring, thereby allowing
communication between users on different LANs.
3The 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.
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:
1A master CoreBuilder 5000 hub is located in the central computer
room on floor 1 of a 3-story building.
2The 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.
3Traffic sent by the departmental LANs travels directly to the master hub.
4A 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.
Figure 2-2 Collapsed Backbone Configuration
Monitoring Ring 4
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Minicomputer
Servers Ring 3
Ring 4
TR-NMC
TR-NMC = Installed Daughter Cards
T-JIT
Ring 1
Ring 2
Ring 3
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Floor 1
IBM 82 30
Bridge/Router
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
Figure 2-3 Single Extended Ring Configuration
Where to Go From
Here
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.
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Flo or 1
3INSTALLING 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
■Setting the DIP Switches
■Installing Optional Daughter Cards
■Installing the Module
CAUTION: Read the precautionary procedures in this chapter before
unpacking the module.
Precautionary
Procedures
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
1Verify that your network complies with the
basic rules for network design. Chapter 2, Designing and
Expanding the Network
2Unpack the module. Chapter 3, Unpacking
Procedures
3Configure 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.
Chapter 3, Setting the DIP
Switches or Chapter 4,
Configuring the Module
4Set the lobe/trunk selection jumper (Model
Numbers 6218M-ATPP and 6218M-ATP). Chapter 3, Setting the
Lobe/Trunk Jumper
(6218M-ATPP and
6218M-ATP)
5Install Token Ring Network Monitor Cards
or Jitter Attenuator Cards as needed. Chapter 3, Installing
Optional Daughter Cards
6Enter the SHOW POWER*command at the
command line of the terminal. This
command displays current power
requirements for the hub.
Chapter 3, Installing the
Module
7Insert 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 3, Installing the
Module
Unpacking Procedures 3-3
For information about potential problems, consult the troubleshooting
techniques in Chapter 5.
Unpacking
Procedures
To unpack your module:
1Verify 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’.
2Remove the module, in its antistatic bag, from the shipping carton.
3Remove 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.
8Establish connections from the module to
devices using the appropriate connectors
and cabling. Chapter 2, Designing and
Expanding the Network, describes cabling
limitations.
Chapter 3, Installing the
Module
9Verify LED status for normal operation. Chapter 4, LED and
Network Verification
*Refer to the CoreBuilder 5000 Integrated System Hub Installation and Operation Guide for
more details on hub power requirements.
Table 3-1 Procedures for Completing Installation (continued)
Step Procedure Section Title
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
Figure 3-1 CoreBuilder 5000 Token Ring Module DIP Switch Locations
ON OFF
SW1
sw2
sw3
sw4
sw5
sw6
sw7
sw8
ON OFF
SW1
sw2
sw3
sw4
sw5
sw6
sw7
sw8
Active Per-Port Switching Module Dual Fiber Repeater Module
Passive Module Active Per-Module Switching Module
DIP
switch
DIP
switch
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.
* Any combination of settings that does not match a specific backplane network causes the
module to be isolated.
Table 3-2 Network Select DIP Switch Settings
Network Selection
Switch Settings*
Switch 1 Switch 2 Switch 3 Switch 4
1 (default) ON OFF OFF OFF
2 OFF ON OFF OFF
3ON ON OFF OFF
4 OFF OFF ON OFF
5ON OFF ON OFF
6 OFF ON ON OFF
7ON ON ON OFF
8 OFF OFF OFF ON
9 ON OFF OFF ON
10 OFF ON OFF ON
isolated*OFF OFF OFF OFF
3-8 INSTALLING THE MODULE
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.
Table 3-3 DIP Switch Setting, Switches 5 through 8
Switch
Number Definition
5ON configures modules from NVRAM.
OFF configures the module from DIP settings.
By default, Switch 5 is set to ON.
6ON disables the Passive Media Module’s speed detection algorithm.
Not Used by other Token Ring Media Modules. The default is ON.
7Not Used
8ON sets the ring speed to 4 Mbps.
OFF sets the ring speed to 16 Mbps.
Default is 16 Mbps.
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.
Figure 3-2 Active Per-Port Module and Active Per-Module Switching
Module Jumper Setting
JP3
JP4
JP5
JP6
JP7
RIRO LOBE
Jumper block
3-10 INSTALLING THE MODULE
Installing Optional
Daughter Cards
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.
Installing a Token
Ring Network
Monitor Card
To install a TR NMC on a CoreBuilder 5000 Token Ring Media Module
(Figure 3-3):
1Match 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.
2Seat the NMC connector onto the media module connector.
3Secure 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.
Installing Optional Daughter Cards 3-11
Figure 3-3 Location of CoreBuilder 5000 Token Ring Network Monitor Cards
Dual Fiber Repeater Module
Connector
Active Per-Module Switching Module
Connector
Network
Monitor
Card
Orientation
ON OFF
SW1
sw2
sw3
sw4
sw5
sw6
sw7
sw8
Active Per-Port Switching Module
Passive Module
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:
1Match 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.
2Seat the card’s connector onto the module’s connector.
3Secure 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
Figure 3-4 Installing a CoreBuilder 5000 Token Ring Jitter Attenuator Card
ON OFF
SW1
sw2
sw3
sw4
sw5
sw6
sw7
sw8
ON OFF
SW1
sw2
sw3
sw4
sw5
sw6
sw7
sw8
Active Per-Port Switching Module Dual Fiber Repeater Module
Passive Module Active Per-Module Switching Module
Jitter
Attenuator
Card
Orientation
(relative to
the standoffs
and
connector)
Connector
Standoffs
Connector
Standoffs
Connector
Standoffs
Connector
Standoffs
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:
1Properly 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.
2Configure 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.
3Determine 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.
4Locate 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
5Insert (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
6Close the media module ejectors (Figure 3-6).
Figure 3-6 Opened and Closed Module Ejectors
7Fasten the spring-loaded screws on the front of the media module
faceplate to the hub using your fingers (do not over-tighten).
Cl osed
position
Hal f-hei ght
level
App ly
pressure
here
Opened
position
Installing the Module 3-17
Copper Lobe Port
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.
Copper
Ring-In/Ring-Out
Trunk Connections
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:
1Attach one end of the twisted pair cable (STP-type only) to the copper
Ring-Out port.
2Attach the other end to a copper Ring-In port on the second module.
3Interconnect 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.
1Remove the plastic fiber covers from the cable ports that will be used.
Keep the unused cable ports capped to keep the optics clean.
2Before installing, make certain all cables have been properly cleaned
with an appropriate fiber optic cleaning solution.
3Attach 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)
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.
4Attach 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.
5If 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.
Where to Go From
Here
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.
4CONFIGURING 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)
■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.
Configuring the
Modules
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
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:
CB5000> set network token_ring token_ring_4 ring_speed 16mbps
Value set 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}
{i solat ed _1 ..._ 11 }
{isolated}
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 ETWO RK {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:
SET PORT {
slot.port
} MODE {enable} {disable}
{
slot
.all}
Use the SET PORT command to disable a port (port 2 on the module in
slot 6):
set port 6.2 mode disable
Enabling Beacon
Recovery
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 token_ring token_ring_3 bcn_recovery
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_threshold 7 [ENTER]
Threshold 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 static_switch disable [ENTER]
Port 6.02 set to DISABLED.
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 token_ring token_ring_3
mismatch_resolution 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 token_ring isolated_3 7 mode backplane
Configuring the Modules 4-9
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).
Figure 4-1 CoreBuilder 5000 Token Ring Network Mode
Setting Port Alert
Filters
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.
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAA
AAA
AAA
AAA
AAA
AA
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:
SET PORT {
slot.port
} ALERT_FILTER {enable}
{
slot.
al l} {di sa ble}
The following command sets alert filter on port 1 of a module in slot 1:
CB5000> set port 1.1 alert_filter enable [ENTER]
Port 01.01 Alert Filter set to ENABLE.
For more information on this command, refer to the Distributed
Management Module Commands Guide.
Enabling Speed
Detect (Passive
Module Only)
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 speed_detect enable [ENTER]
Port 07.01 Speed Detection set to ENABLED.
Configuring Trunks 4-11
Setting Module
Speed Threshold
(Passive Module
Only)
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.
Example: The following command sets the speed threshold of the 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 speed_threshold 7 [ENTER]
Threshold 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:
The command sequence for the trunk compatibility mode is:
SET TRUNK{
slot
} ring_in.{1 or 2} COMPATIBILITY_MODE {
mode
}
ring_out.{1 or 2}
Where: {slot} = slot containing the trunk port
{mode} = disable, enable, CoreBuilder 5000, ONline, 8230, 8260, 8250
Saving the
Configuration
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.
Showing Module
Configurations
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.
Table 4-2 ONline Compatibility Settings
To Connect ONline to: Set Compatibility Mode to:
ONline Disable
CoreBuilder 5000 Disable
IBM 8230 CAU Enable
4-14 CONFIGURING THE MODULE
Using the Show
Module Command
The SHOW MODULE command enables you to display both brief and
verbose information about a particular module. The command
sequence is:
SHOW MODULE {slot.subslot} {verbose}
{
slot.
al l} {n o_ver bo se}
Example: The following output is an example of the SHOW MODULE VERBOSE
command issued for a media module installed in slot 10:
CB5000> Show module 5.1 verbose
Slot Module Version Network General Information
----- -------------- ------- ------------ -------------------
05.01 6220M-TP 1.00.0 TOKEN_RING_1
6220M-TP: CB5000 Token Ring Passive Module Switching Twisted Pair
Module
Boot Version: 1.00.0
Ring Speed DIP Setting: 16 MBPS
DIP Network Setting: ISOLATED
Non-Volatile DIP Setting: DISABLED
Recovery Asic Primary Address: 52-41-50-4d-41-43
Recovery Asic Secondary Address: 52-41-53-4d-41-43
Beacon Threshold: 7
Speed Detect Threshold: 7
Showing Module Configurations 4-15
Using the Show Port
Command
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
} {verbose}
{
slot.
a ll} {n o_ve rbo se}
Example: 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):
CB5000> show port 7.all verbose
Port Display for Module 6218M-ATPP :
Port Mode Status Network General Information
----- -------- --------------- --------------- ------------------
07.01 ENABLED NO PHANTOM TOKEN_RING_1 Port is down
Port Alert Filter: DISABLED
Port Connector: RJ45S
DIP Network Setting: ISOLATED_11
Static Switch: DISABLED
07.02 ENABLED NO PHANTOM TOKEN_RING_1 Port is down
Port Alert Filter: DISABLED
Port Connector: RJ45S
DIP Network Setting: ISOLATED_11
Static Switch: DISABLED
Port Mode Status Network General Information
----- -------- --------------- ---------------- -----------------
07.03 ENABLED NO PHANTOM TOKEN_RING_1 Port is down
Port Alert Filter: DISABLED
Port Connector: RJ45S
DIP Network Setting: ISOLATED_11
Static Switch: DISABLED
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 shows the location of the LEDs. Each LED indicates the
state of a port as described in Table 4-3.
Figure 4-2 Media Module Faceplates
18/R
17/RO
MOD/STA
JA
RIRO
MOD/STA
1
2
MODULE
STAT US
TX
RX
TX
RX
TX
RX
TX
RX
RO-2
RI-2
RO-1
RI-1
1
2
3
4
5
6
7
8
9
10
1
3
5
7
9
RI1
RI2
JA1
2
4
6
8
10
RO1
RO2
JA2
18/R
17/RO
MOD/STA
JA
RIRO
Active Per-Port
Switching Module Active Per-Module
Switching Module Passive Medi a
Module Dual Fiber
Re p eater Mo d ule
3
6
9
12
15
18
1
4
7
10
13
16
1
4
7
10
13
16
LED and Network Verification 4-17
LED and Network
Verification
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.
Using the
CoreBuilder 5000
Controller Module
to Verify LED
Operation
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.
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
Green OFF Trunk disabled.
ON Trunk enabled and operating.
Blinking Trunk enabled, but not operating.
Port Status Green ON Port enabled, phantom detected, port
enabled onto ring, status OK.
1 blink Port enabled, no phantom.
OFF Port disabled.
Jitter
Attenuator
Card (JA, JA1,
JA2)
Green OFF Card not installed.
ON Card installed and operating normally.
RI/RO (ATPP,
ATP) Green OFF Ports 17 and 18 are lobe ports.
ON Ports 17 and 18 Trunk (RI/RO) ports.
4-18 CONFIGURING THE MODULE
Using the DMM to
Verify Network
Connections
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:
1Press the Display Control Toggle button on the front of the module.
2Observe 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.
Where to Go From
Here
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.
5TROUBLESHOOTING
This chapter describes troubleshooting procedures for the
CoreBuilder™5000 Token Ring Module. Information on troubleshooting
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
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 of this guide
■Any attaching device or station is set to the same ring speed as the
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
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
Troubleshooting
Using the Module
Status LED
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 Possible Cause Corrective Action
OFF Hub power is off Check the controller module power
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 Indication Possible Cause Corrective Action
1 blink Port enabled, but
no station is
detected
(phantom
current is not
detected).
Station not powered. Turn on the PC or other
connected.
Faulty cable. Replace the cable
No cable connected
to station. Disable the port.
Station speed does
not match the
network speed.
Check the speed of the
station and network.
Make sure the speeds
match.
Station not inserted
on ring. Run your software
application to cause the
Token Ring end station to
insert onto the ring.
OFF Port disabled Port disabled. Enable port.
Module not
receiving power. Check the controller
module power LEDs.
Power management
system has powered
down slot.
Check hub power
management settings (see
the DMM User Guide for
more information).
Broken LED. Press the LED check
button on the controller
module.
Faulty module. Replace module.
Troubleshooting Ring Problems 5-5
Troubleshooting
Ring Problems
This section provides remedies for problems you could encounter when
working with Token Ring Networks.
Problems Adding a
New Station to an
Operating Ring
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:
1Verify 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.
2Verify that the station adapter card is set to the same ring speed as the
hub port.
3Verify 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.
4Verify 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. Also, verify that the pinout of the
attaching cables meets the requirements described in Appendix A.
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
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
Ring Failures In some situations, an operating ring may fail. However, the ring wraps
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:
1Verify 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.
2Verify that any other devices in the trunk path (for example, repeaters)
are operating properly.
Trunk Interoperability Problems 5-7
3If 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:
1Have set each end of the connection to the proper compatibility mode
(see Chapter 4 for more information).
2Install a jitter attenuator card on the CoreBuilder 5000 module if
connecting to a non-CoreBuilder 5000 ring.
3Only 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.
4Check that all cabling used meets the specifications outlined in
Chapter 2.
5Check that the fiber cabling is connected properly (that is, transmit
always connects directly to receive).
6If 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.
7When trunk ports are enabled, check that the jumpers for the trunks
are set properly.
5-8 TROUBLESHOOTING
Technical
Assistance
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)
Where to Go From
Here
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.
ASPECIFICATIONS
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
Systems
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
1 Token Ring Network Monitor Card
Environmental
Operating Temperature
Humidity
BTUs/hr
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
0° to 50° C (32° to 122°F)
Less than 95%, noncondensing
96.9
Connectors Shielded RJ-45, ST Fiber Optic
Data Rate 4 and 16 Mbps
Cable Requirements Supports UTP, STP, and 120 ohm Cabling
Systems
Supports Fiber 62.5/125 µm, 50/125 µm, 85/125
µm, 100/140 µm
Power Requirements 37 w +5 V DC, 0.5 w +12 V DC,
and 0.25 w -12 V DC
Mechanical Occupies 1 Slot
Daughter Card Support 2 Jitter Attenuator Daughter Cards
1 Token Ring Network Monitor Card
Environmental
Operating Temperature
Humidity
BTUs/hr
0° to 50° C (32° to 122°F)
Less than 95%, noncondensing
128.8
Token Ring Passive Media Module Specifications A-3
Token Ring Passive
Media Module
Specifications
Token Ring Jitter
Attenuator Card
Specifications
Fiber Transmitter Light Source: LED at wavelength 850 nm
Transmit Power: -13 to -19 dBm average
Fiber Receiver
Light Detector: Silicon PIN photodiode
Input Range:
Optical power input of -12 to -28 dBm
Dynamic Range: 16 dBm
Bit Error Rate: 1 in 10-10 over dynamic range
Fiber Connectors ST-type
Connectors Shielded RJ-45
Data Rate 4 and 16 Mbps
Cable Requirements Supports UTP, STP, and 120 ohm Cabling
Systems
Power Requirements 16 w +5 V DC, 1.5 w +12 V DC, and 1.25 w -12
V DC
Mechanical Occupies One Slot
Daughter Card Support 1 Token Ring Network Monitor Card
Environmental
Operating Temperature
Humidity
BTUs/hr
0° to 50° C (32° to 122°F)
Less than 95%, noncondensing
64
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
0° to 50° C (32° to 122°)
Less than 95%, noncondensing
8.5
Mechanical 2.5” x 5” (6.35 cm x 12.7 cm)
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)
Figure A-1 RJ-45 Connector Pinouts
12 435678
W-G G W-O BL W-BL O W-BR BR
Hub Transmit
Jack Positions
Hub Receive
Not Used Not Used
Station Receive
Station Transmit
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
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
BTECHNICAL SUPPORT
3Com provides access to technical support information through a
variety of services. This appendix describes these services.
Information contained in this appendix is correct at time of publication.
For the very latest, access 3Com Corporation’s World Wide Web site as
described below.
This appendix describes:
■Online Technical Services
■Support From Your Network Supplier
■Support From 3Com Corporation
■Returning Products for Repair
■Accessing the 3Com MIB
■Contacting 3Com Technical Publications
Online Technical
Services
3Com offers worldwide product support 24 hours a day, 7 days a
week, through the following online systems:
■World Wide Web Site
■3Com Bulletin Board Service
■3ComFacts Automated Fax Service
■3ComForum on CompuServe Online Service
B-2 TECHNICAL SUPPORT
World Wide Web Site Access the latest networking information on 3Com Corporation’s World
Wide Web site by entering our URL into your Internet browser:
http://www.3Com.com/
This service features news and information about 3Com products,
customer service and support, 3Com Corporation’s latest news releases,
NetAge Magazine, and more.
3Com Bulletin Board
Service
3ComBBS contains patches, software, and drivers for all 3Com
products, as well as technical articles. This service is available through
modem or ISDN 24 hours a day, 7 days a week.
Access by Analog Modem
To reach the service by modem, set your modem to 8 data bits,
no parity, and 1 stop bit. Call the telephone number nearest you:
Access by Digital Modem
ISDN users can call 3ComBBS using a digital modem for fast access up
to 56 Kbps. To access 3ComBBS using ISDN, use the following number:
408 654 2703
Country Data Rate Telephone Number
Australia up to 14400 bps 61 2 9955 2073
Brazil up to 14400 bps 55 11 547 9666
France up to 14400 bps 33 1 6986 6954
Germany up to 28800 bps 4989 62732 188
Hong Kong up to 14400 bps 852 2537 5608
Italy (fee required) up to 14400 bps 39 2 27300680
Japan up to 14400 bps 81 3 3345 7266
Mexico up to 28800 bps 52 5 520 7853
P. R. of China up to 14400 bps 86 10 684 92351
Singapore up to 14400 bps 65 534 5693
Taiwan up to 14400 bps 886 2 377 5840
U.K. up to 28800 bps 44 1442 438278
U.S.A. up to 28800 bps 1 408 980 8204
Online Technical Services B-3
3ComFacts
Automated Fax
Service
3Com Corporation’s interactive fax service, 3ComFactsSM, provides data
sheets, technical articles, diagrams, and troubleshooting instructions on
3Com products 24 hours a day, 7 days a week.
Call 3ComFacts using your Touch-Tone telephone using one of these
international access numbers:
Local access numbers are available within the following countries:
3ComForum on
CompuServe Online
Service
3ComForum is a CompuServe-based service containing patches,
software, drivers, and technical articles about 3Com products, as well
as a messaging section for peer support. To use 3ComForum, you
need a CompuServe® account.
To use 3ComForum:
1Log on to CompuServe.
2Typ e go threecom
3Press Return to view the 3ComForum main menu.
Country Telephone Number
Hong Kong 852 2537 5610
U.K. 44 1442 278279
U.S.A. 1 408 727 7021
Country
Telephone
Number Country
Telephone
Number
Australia 1 800 123853 Netherlands 06 0228049
Belgium 0800 71279 Norway 800 11062
Denmark 800 17319 Portugal 0505 442 607
Finland 98 001 4444 Russia (Moscow only) 956 0815
France 05 90 81 58 Spain 900 964 445
Germany 0130 81 80 63 Sweden 020 792954
Italy 1678 99085 U.K. 0800 626403
B-4 TECHNICAL SUPPORT
Support From Your
Network Supplier
If additional assistance is required, contact your network supplier.
Several suppliers are authorized 3Com service partners who are
qualified to provide a variety of services, including network planning,
installation, hardware maintenance, application training, and support
services.
If you contact your network supplier for assistance, have the following
information ready:
■Diagnostic error messages
■A list of system hardware and software, including revision levels
■Details about recent configuration changes, if applicable
If you are unable to contact your network supplier, refer to the
following section on how to contact 3Com.
Support From 3Com Corporation B-5
Support From
3Com Corporation
If you are unable to receive support from your network supplier,
technical support contracts are available from 3Com.
Contact your local 3Com sales office to locate your authorized service
provider using one of the following numbers:
Regional Sales Office Telephone Number Regional Sales Office Telephone Number
3Com Corporation
U.S.A.
3Com ANZA
East
West
3Com Asia Limited
China
Hong Kong
India
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3Com Benelux B.V.
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3Com France
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Austria
Czech and Slovak Republics
Germany
Hungary
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Switzerland
800 NET 3Com or
1 408 764 5000
61 2 9937 5000
61 3 9866 8022
86 10 68492 568 (Beijing)
86 21 6374 0220 Ext 6115
(Shanghai)
852 2501 1111
91 11 644 3974
62 21 523 9181
82 2 319 4711
60 3 732 7910
65 538 9368
886 2 377 5850
662 231 8151 4
32 725 0202
31 30 6029700
403 265 3266
514 683 3266
613 566 7055
416 498 3266
604 434 3266
33 1 69 86 68 00
43 1 5134323
42 2 21845 800
49 30 3498790 (Berlin)
49 89 627320 (Munich)
36 1 250 83 41
48 22 6451351
41 31 996 14 14
3Com Ireland
3Com Japan
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Argentina
Brazil
Chile
Colombia
Mexico
Peru
Venezuela
3Com Mediterraneo
Italy
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3Com Nordic AB
Denmark
Finland
Norway
Sweden
3Com Russia
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3Com UK Limited
353 1 820 7077
81 3 3345 7251
54 1 312 3266
55 11 546 0869
56 2 633 9242
57 1 629 4110
52 5 520 7841
51 1 221 5399
58 2 953 8122
39 2 253011 (Milan)
39 6 5279941 (Rome)
971 4 349049
45 39 27 85 00
358 0 435 420 67
47 22 18 40 03
46 8 632 56 00
007 095 2580940
27 11 807 4397
44 131 2478558 (Edinburgh)
44 161 8737717 (Manchester)
44 1628 897000 (Marlow)
B-6 TECHNICAL SUPPORT
Returning Products
for Repair
Before you send a product directly to 3Com for repair, you must first
obtain a Return Materials Authorization (RMA) number. Products sent
to 3Com without RMA numbers are returned to the sender unopened,
at the sender’s expense.
To obtain an RMA number, call or fax:
Accessing the
3Com MIB
The 3Com Management Information Base (MIB) describes commands
that enable you to manage 3Com SNMP-based products. The MIB is
available over the Internet on an anonymous FTP server. Updates to
these MIBs are released as new 3Com products are introduced.
To access Internet versions:
1FTP to ftp.3com.com (151.104.9.65).
2Enter the login name anonymous.
3Enter your full Internet e-mail address as the password
(for example, jdoe@company.com).
4Change to the /pub/mibs directory using the command cd/pub/mibs.
5Read the readisd.txt file to determine the MIB or MIBs you need to
manage your 3Com products.
6To view the 3Com MIB, OID, or schema entries, enter the ls command.
■To pause the display, press Ctrl+S.
■To continue the display, press Ctrl+Q.
7Copy the MIB, OID, or schema files to your current directory using the
appropriate command (for example, get isd.mib).
8Exit the FTP session using the quit command.
Country Telephone Number Fax Number
U.S.A. and Canada 1 800 876 3266, option 2 408 764 7120
Latin America 1 408 326 7801 408 764 7120
Europe, South Africa and
Middle East 44 1442 438125 44 1442 435822
Outside Europe, U.S.A.,
and Canada 1 408 326 7804 1 408 764 7120
Contacting 3Com Technical Publications B-7
Contacting 3Com
Technical
Publications
If you have comments or questions on 3Com Technical Publications
documents, contact the Technical Publications group by fax at
(508) 229-1551.
02/06/97
INDEX
Numerics
120 Ohm cable specifications 2-8
3Com Bulletin Board Service (3ComBBS) B-2
3Com sales offices B-5
3Com URL B-2
3ComFacts B-3
3ComForum B-3
8-pin connector A-4
A
Active Per-Module Switching Media Module 1-7
Active Per-Port Switching Media Module 1-5
Adding a new node to ring 5-5
Address-to-Port mapping 1-4
Audience of Manual 1
B
Backbone configurations
collapsed backbone 2-14, 2-15
single extended ring 2-17, 2-18
traditional backbone ring 2-12, 2-13
Backbone ring, description 2-12
Beacon recovery 1-4
enabling 4-5
threshold setting 4-6
bulletin board service B-2
C
Cable lengths 2-6
calculating 2-4
recommended 2-6
selecting 2-4
Cable pinouts A-4
Cable specifications
level 4 2-8
level 5 2-8
Cabling standards 2-6
Channel attenuation 2-5
Chapter descriptions 1
Collapsed backbone architecture 2-14
Collapsed backbone ring, description 2-14
CompuServe B-3
Configuration
media module 4-1
Configuration commands
assign module 4-4
assign ports 4-4
enable ports 4-5
enable static ring switching 4-6
set network ring speed 4-3
Configuration examples 2-12
Configuration rules
maximum lobe lengths 2-6, 2-7
Connections
hardware 2-9
RI/RO 1-14
Connector pinouts A-4
Copper trunk ports, connecting 2-9
CoreBuilder 5000 hub
hot swap capabilities 3-14
D
Daughter cards, installing 3-10
DIP switch
location 3-7
module configuration 3-5
overview 3-5
setting 3-5
DIP switch settings
network assignment 4-4
DPLL 1-3
Dual Fiber Repeater Module 1-12
Dual phase-locked loop 1-3
E
Electro-static discharge
precautionary procedures 3-1
Extended ring configuration, description 2-17
External jitter, reducing 1-3
F
2INDEX
Fan-out device 1-7
APM in trunk mode 1-7
fax service. See 3ComFacts
FCC notice ii
Fiber optic
connectors A-3
Fiber trunks
cables 2-9
connecting 3-18
Front panel
monitoring 4-16
Front panel indicators
status indicators 4-16
status LEDs 4-17
H
How to unpack module 3-3
I
Installation
hot swap capabilities 3-14
installing the module 3-15, 3-16
quick installation chart 3-2
Intermittent errors 5-6
Internal jitter, reducing 1-3
J
Jitter
definition 1-3
reduction 1-2
Jitter attenuator
card 1-14
installing 3-12
location 3-12
Jumper setting 3-9
L
LED and network verification 4-17
Lobe cable requirements 2-7
Lobe cabling 2-6
maximum distances 2-7
UTP/Level 4 2-8
lobe lengths, maximum 2-3
M
Maximum
copper trunk lengths 2-7
lobe lengths 2-6, 2-7
station count 2-4
Maximum lobe lengths 2-7
Media filters 2-11
Media module
features 1-1
installing 3-2, 3-14
LEDs 4-17
procedures for handling 3-1
Media module LEDs
interpreting 4-17
Media modules
listed 1-4
Medium Interface Connector (MIC) 2-5
MIBs
3Com B-6
Mismatch resolution 4-7
Module configurations
saving 4-13
showing 4-13
Module switching 1-2
N
Network 2-2
building 2-2
ring speed 4-3
selection 4-4
Network management 4-1, 4-4
commands 4-2
configuring 4-2
Network Monitor Cards, using 3-4
network supplier support B-4
New stations to a ring, adding 5-5
NVRAM 3-8
O
Online technical services B-1
ONline Token Ring Bridge Module 2-12
ONline Token Ring Media Module 2-17
Orientation, jitter card 3-12
INDEX 3
P
Passive Media Module 1-10
Pinout, diagram 3-17, A-4
PLL (Phase-Locked Loop) 1-3
Port 4-12
active 1-2, 2-4
passive 2-4
retiming 1-2
Port switching 1-1
Ports 1-2
assigning 4-4
configuring 4-5
connecting trunk ports 4-12
enabling 4-5
R
Retiming 1-2
returning products for repair B-6
Ring beaconing 5-6
Ring speed
determining 2-2
setting 4-3
threshold 4-11
Ring-In Wire, diagram A-5
Ring-In/Ring-Out ports, connecting 3-17
Rings, moving between hub and module 4-8
backplane 4-8
isolated 4-8
S
Screened twisted pair cabling 2-8
Signal to NEXT ratio 2-5
Simple Network Management Protocol (SNMP)
commands B-6
Single extended ring configuration 2-17
SNMP. See Simple Network Management Protocol
Specifications A-1
Active Per-Module Switching Media Module A-2
Active Per-Port Switching Media Module A-1
Jitter Attenuator Card A-3
Passive Media Module A-3
Speed detection 1-2
DIP setting 3-8
enabling 4-10
Standards, for cabling 2-6
Static ring switching, enable 4-6
Stations, maximum number 2-2, 2-4
Status LEDs
troubleshooting 5-4
STP 2-7
cables 2-7
T
Technical Assistance 5-8
technical support B-1
3Com URL B-2
bulletin board service B-2
fax service B-3
network suppliers B-4
product repair B-6
using CompuServe B-3
Token Ring Active Per-Module Switching Media
Module 1-9
TR NMC, installing 3-10
Traditional backbone configuration 2-12, 2-13
Transmitter variation 2-5
Troubleshooting 5-5
adding a new station to a ring 5-5
general tips 5-2
ring failures 5-6
Technical Assistance 5-8
using port status LEDs 5-4
using the module status LED 5-3
Trunk cable recommendations 2-9
Trunk port
jumper 3-9
Trunk ports
connecting 3-17
Trunks
compatibility mode 4-12
configuring 4-11
connecting to 8230 4-12
mode 4-12
Twisted pair
cable pinouts A-4
connectors A-4
U
Unpacking the module 3-3
Unshielded Twisted Pair
level 4 cable 2-8
URL B-2
UTP cables 2-8
3Com Corporation LIMITED WARRANTY
For purposes of this warranty, the CoreBuilder 5000 Token Ring Media Module is considered an Internetworking product.
HARDWARE 3Com warrants its hardware products to be free from defects in workmanship and materials, under
normal use and service, for the following lengths of time from the date of purchase from 3Com or its
Authorized Reseller:
If a product does not operate as warranted above during the applicable warranty period, 3Com shall, at
its option and expense, repair the defective product or part, deliver to Customer an equivalent product or
part to replace the defective item, or refund to Customer the purchase price paid for the defective
product. All products that are replaced will become the property of 3Com. Replacement products may be
new or reconditioned. Any replaced or repaired product or part has a 90-day warranty or the remainder of
the initial warranty period, whichever is longer.
3Com shall not be responsible for any software, firmware, information, or memory data of Customer
contained in, stored on, or integrated with any products returned to 3Com for repair, whether under
warranty or not.
SOFTWARE 3Com warrants that the software programs licensed from it will perform in substantial conformance to the
program specifications therefor for a period of 90 days from the date of purchase from 3Com or its
Authorized Reseller. 3Com warrants the media containing software against failure during the warranty
period. No updates are provided. 3Com’s sole obligation with respect to this express warranty shall be (at
3Com’s discretion) to refund the purchase price paid by Customer for any defective software products, or
to replace any defective media with software which substantially conforms to 3Com’s applicable published
specifications. Customer assumes responsibility for the selection of the appropriate applications program
and associated reference materials. 3Com makes no warranty or representation that its software products
will work in combination with any hardware or applications software products provided by third parties,
that the operation of the software products will be uninterrupted or error free, or that all defects in the
software products will be corrected. For any third-party products listed in the 3Com software product
documentation or specifications as being compatible, 3Com will make reasonable efforts to provide
compatibility, except where the noncompatibility is caused by a “bug” or defect in the third party’s
product.
STANDARD WARRANTY
SERVICE
Standard warranty service for hardware products may be obtained by delivering the defective product,
accompanied by a copy of the dated proof of purchase, to 3Com’s Corporate Service Center or to an
Authorized 3Com Service Center during the applicable warranty period. Standard warranty service for
software products may be obtained by telephoning 3Com’s Corporate Service Center or an Authorized
3Com Service Center, within the warranty period. Products returned to 3Com’s Corporate Service Center
must be pre-authorized by 3Com with a Return Material Authorization (RMA) number marked on the
outside of the package, and sent prepaid, insured, and packaged appropriately for safe shipment. The
repaired or replaced item will be shipped to Customer, at 3Com’s expense, not later than 30 days after
receipt of the defective product by 3Com.
WARRANTIES EXCLUSIVE IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, CUSTOMER’S SOLE REMEDY FOR
BREACH OF THAT WARRANTY SHALL BE REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE
PAID, AT 3COM’S OPTION. TO THE FULL EXTENT ALLOWED BY LAW, THE FOREGOING WARRANTIES AND
REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES, TERMS, OR CONDITIONS,
EXPRESS OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, STATUTORY OR OTHERWISE,
INCLUDING WARRANTIES, TERMS, OR CONDITIONS OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE, AND SATISFACTORY QUALITY. 3COM NEITHER ASSUMES NOR AUTHORIZES ANY OTHER
PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE, INSTALLATION,
MAINTENANCE, OR USE OF ITS PRODUCTS.
Internetworking products 1 year
Network adapters Lifetime
Ethernet stackable hubs and Unmanaged Ethernet fixed port repeaters Lifetime*
(1 year if not registered)
*Power supply and fans in the stackable hubs and unmanaged repeaters 1 year
Other hardware products 1 year
Spare parts and spares kits 90 days
3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION DISCLOSE
THAT THE ALLEGED DEFECT IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY CUSTOMER’S OR
ANY THIRD PERSON’S MISUSE, NEGLECT, IMPROPER INSTALLATION OR TESTING, UNAUTHORIZED
ATTEMPTS TO REPAIR OR MODIFY, OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE,
OR BY ACCIDENT, FIRE, LIGHTNING, OR OTHER HAZARD.
LIMITATION OF LIABILITY TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO EXCLUDES FOR ITSELF AND ITS SUPPLIERS ANY
LIABILITY, WHETHER BASED IN CONTRACT OR TORT (INCLUDING NEGLIGENCE), FOR INCIDENTAL,
CONSEQUENTIAL, INDIRECT, SPECIAL, OR PUNITIVE DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE
OR PROFITS, LOSS OF BUSINESS, LOSS OF INFORMATION OR DATA, OR OTHER FINANCIAL LOSS ARISING
OUT OF OR IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE, USE, PERFORMANCE,
FAILURE, OR INTERRUPTION OF ITS PRODUCTS, EVEN IF 3COM OR ITS AUTHORIZED RESELLER HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, AND LIMITS ITS LIABILITY TO REPAIR, REPLACEMENT,
OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM’S OPTION. THIS DISCLAIMER OF LIABILITY FOR
DAMAGES WILL NOT BE AFFECTED IF ANY REMEDY PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL
PURPOSE.
Some countries, states, or provinces do not allow the exclusion or limitation of implied warranties or the
limitation of incidental or consequential damages for certain products supplied to consumers, so the above
limitations and exclusions may be limited in their application to you. This warranty gives you specific legal
rights which may vary depending on local law.
GOVERNING LAW This Limited Warranty shall be governed by the laws of the state of California.
3Com Corporation, 5400 Bayfront Plaza, Santa Clara, CA 95052-8145 (408) 764-5000
10/20/96
