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ONline Ethernet 24-Port
10BASE-T Module
Installation Guide
Document Number 17-00232-3
Printed February 1996
Model Number: 5124M-TPCL
5124M-TP
3Com Corporation
118 Turnpike Road
Southborough, MA 01772-1886
U.S.A.
(508) 460-8900
FAX (508) 460-8950
Federal Communications Commission
Notice
This equipment has been 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
Cet appareil numérique respecte les limites de bruits radioélectriques applicables aux appareils numériques de Classe A prescrites dans la norme sur la matériel brouilleur: "Appareils Numériques", NMB-003 édictée par le Ministère des Communications.
This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus as set out in the interference-causing equipment standard entitled "Digital Apparatus", ICES-003 of the Department of Communications.
VDE Class B Compliance
Hiermit wird bescheinigt, dass der 5124M-TPCL in Üebereinstimmung mit den Bestimmungen der Vfg 243/1991 funkentstöert ist.
Der Deutschen Bundespost wurde das Inverkehrbringen dieses Geraetes angezeigt und die Berechtigung zur Üeberprüefung der Serie auf Einhaltung der Bestimmungen eingeräeumt.
Einhaltung mit betreffenden Bestimmugen kommt darauf an, dass geschirmte Ausfuehrungen gebraucht werden. Fuer die Beschaffung richtiger Ausfuehrungen ist der Betreiber verantwortlich.
This is to certify that the 5124M-TPCL is shielded against radio interference in accordance with the provisions of Vfg 243/1991.
The German Postal Services have been advised that this equipment is being placed on the market and that they have been given the right to inspect the series for compliance with regulations.
Compliance with applicable regulations depends on the use of shielded cables. The user is responsible for procuring the appropriate cables.
EN55022/CISPR22 Compliance
This equipment conforms to the Class A emissions limits for a digital device as defined by EN55022 (CISPR22).
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.
UK General Approval Statement
The ONcore Switching Hub, ONline System Concentrator, and ONsemble StackSystem Hub are manufactured to the International Safety Standard EN 60950 and are approved in the UK under the General Approval Number NS/G/12345/J/100003 for indirect connection to the public telecommunication network.
Disclaimer
The information in this document is subject to change without notice and should not be construed as a commitment by 3Com Corporation. 3Com Corporation assumes no responsibility for any errors that may appear in this document.
Copyright Statement
© 1996, by 3Com Corporation. Printed in U.S.A. All rights reserved. 3Com is a registered trademark of 3Com Corporation. ONcore is a registered trademark of 3Com Corporation. The information contained herein is the exclusive and confidential property of 3Com Corporation. No part of this manual may be disclosed or reproduced in whole or in part without permission from 3Com Corporation.
Trademarks
Because of the nature of this material, numerous hardware and software products are mentioned by name. In most, if not all cases, these product names are claimed as trademarks by the companies that manufacture the products. It is not our intent to claim these names or trademarks as our own.
Artel, Chipcom, Ethermodem, Galactica, ONcore, ORnet, StarBridge, and TriChannel are registered trademarks of 3Com Corporation.
Chipcom OpenHub, G-Man, LANsentry, MultiProbe, ONdemand, ONline, ONsemble, PowerRing, SL2000, SL3000, SL4000, StackJack, StackSystem, and SwitchCentral are trademarks of 3Com Corporation.
ii ONline Ethernet 24-Port 10BASE-T Module Installation and Operation Guide
The Chipcom Multichannel Architecture Communications System is registered under U.S. Patent Number 5,301,303.
XNS is a trademark of Xerox Corporation.
DEC, DECnet, the Digital logo, DELNI, POLYCENTER, VAX, VT100, and VT220 are trademarks of Digital Equipment Corporation.
IBM is a registered trademark of International Business Machines. NetView is a trademark of International Business Machines.
3ComFacts, Ask 3Com, CardFacts, NetFacts, and CardBoard are service marks of 3Com Corporation.
3Com, LANplex, BoundaryRouting, LanScanner, LinkBuilder, NETBuilder, NETBuilderII, ParallelTasking, ViewBuilder, EtherDisk, Etherl\Link, EtherLink Plus, EtherLink II, TokenLink, TokenLink Plus, and TokenDisk are registered trademarks of 3Com Corporation.
3ComLaser Library, 3TECH, CacheCard, FDDILink, FMS, NetProbe, SmartAgent, Star-Tek, and Transcend are trademarks of 3Com Corporation.
CompuServe is a registered trademark of CompuServe, Inc.
3Com registered trademarks are registered in the United States, and may or may not be registered in other countries. Other brand and product names may be registered trademarks or trademarks of their respective holders.
Restricted Rights
Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1) (ii) of the Rights in Technical Data and Computer Software clause at
DFARS 252.227-7013.
Printed on recycled paper.
ONline Ethernet 24-Port 10BASE-T Module Installation and Operation Guide iii
iv ONline Ethernet 24-Port 10BASE-T Module Installation and Operation Guide
Contents
How to Use This Guide
Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii Structure of This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi 3Com Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xvii Reference Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xvii
Chapter 1 — Introduction
Ethernet 24-Port 10BASE-T Module Description . . . . . . . . . . . . . . . . . . . . . .1-1 Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2 Bank Switching Capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3 Model Number 5124M-TPCL Features . . . . . . . . . . . . . . . . . . . . . . . . . .1-3 Model Number 5124M-TP Features . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Chapter 2 — Designing and Expanding the Network
Understanding the General Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
Rules for Configuring a Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
LAN Equivalence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
Choosing a Network Backbone Cabling Structure . . . . . . . . . . . . . . . . . . . .2-7
Building a Network (Star Configuration) . . . . . . . . . . . . . . . . . . . . . . . .2-8
Building a Network (Serial Configuration) . . . . . . . . . . . . . . . . . . . . . . .2-9
24-Port Module Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10
Fiber Backbone, 10BASE-T To-The-Desk . . . . . . . . . . . . . . . . . . . . . . . .2-10
10BASE-T Backbone, 10BASE-T To-The-Desk . . . . . . . . . . . . . . . . . . . .2-12
Using Patch Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-14
Establishing Fault-Tolerant Configurations . . . . . . . . . . . . . . . . . . . . . . . . .2-14
Setting Port Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-15
Configuring Ports for Fault Tolerance . . . . . . . . . . . . . . . . . . . . . .2-15
ONline Ethernet 24-Port 10BASE-T Module Installation Guide v
Setting Backbone Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-15
Redundant Twisted Pair Backbone . . . . . . . . . . . . . . . . . . . . . . . .2-16
Chapter 3 — Installing and Operating the Module
Precautionary Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
.3-2 |
Quick Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
.3-2 |
Unpacking Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
.3-4 |
Setting the DIP Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
.3-4 |
DIP Switch Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
.3-5 |
DIP Switch Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
.3-7 |
Installing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-10 |
Using 90° Cable Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-13 |
Installing the Cable Tie-Wrap Kit . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-13 |
Securing 90° Cables to the Module . . . . . . . . . . . . . . . . . . . . . . . |
3-15 |
Configuration in a Managed Environment . . . . . . . . . . . . . . . . . . . . . . . . |
3-17 |
If Management is Not Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-18 |
Before Configuring the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-19 |
Enabling Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-19 |
Enabling Port Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-19 |
Enabling Link Integrity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-20 |
Selecting a Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-20 |
Enabling Remote Diagnostics Mode . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-21 |
Setting the Autopartition Threshold Value . . . . . . . . . . . . . . . . . . . . . |
3-22 |
Saving Module Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-23 |
Showing Module Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-23 |
Show Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-24 |
Show Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-25 |
Gathering Network Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-27 |
Selecting the Per-Port Counters Connector . . . . . . . . . . . . . . . . . . . . . |
3-28 |
Monitoring the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-29 |
Verifying LED and Network Assignments . . . . . . . . . . . . . . . . . . . . . . . . . |
3-32 |
Using the LED Check Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3-32 |
vi ONline Ethernet 24-Port 10BASE-T Module Installation Guide
Chapter 4 — Troubleshooting
Troubleshooting Using the Port Status and Port Activity LEDs . . . . . . . . . . .4-2 Troubleshooting Using the Port Status LEDs . . . . . . . . . . . . . . . . . . . . .4-2 Troubleshooting Using the Port Activity LEDs . . . . . . . . . . . . . . . . . . . .4-4 Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
Appendix A — Specifications
General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Power Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
Twisted Pair Cable and Connector Specifications . . . . . . . . . . . . . . . . . . . . A-5
Twisted Pair Cable Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6
Twisted Pair Connector Specifications . . . . . . . . . . . . . . . . . . . . . . . . . A-7
RJ-45 Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
50-Pin Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
Connecting Twisted Pair Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12
Appendix B — Technical Support
On-line Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1 Email Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2 World Wide Web Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2 Support from Your Network Supplier . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2 Support from 3Com . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-3 Returning Products for Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-4 Accessing the 3Com MIB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-4 3Com Technical Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-5
Index
ONline Ethernet 24-Port 10BASE-T Module Installation Guide vii
viii ONline Ethernet 24-Port 10BASE-T Module Installation Guide
Figures
Figure 1-1. Typical 24-Port Module Configuration . . . . . . . . . . . . . . . . .1-5 Figure 2-1. Star-Wiring Configuration . . . . . . . . . . . . . . . . . . . . . . . . . .2-8 Figure 2-2. Serial Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9 Figure 2-3. Sample Configuration Distance Calculation Using
24-Port Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11 Figure 2-4. Unshielded Twisted Pair Network Using 24-Port Modules .2-13 Figure 2-5. Redundant Twisted Pair Configuration Using 24-Port
Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-16 Figure 3-1. Model 5124M-TPCL and Model 5124M-TP DIP Switch
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6 Figure 3-2. Installing a 24-Port Module (Model Number 5124M-TPCL) 3-11 Figure 3-3. 24-Port Module Cable Connection
(Model Number 5124M-TPCL) . . . . . . . . . . . . . . . . . . . . .3-12 Figure 3-4. Attaching the Tie-Wrap Bracket to the Module . . . . . . . . .3-14 Figure 3-5. Attaching Cables With 90° Connectors
(Model Number 5124M-TPCL) . . . . . . . . . . . . . . . . . . . .3-15 Figure 3-6. Attaching Cables With 90° Connectors . . . . . . . . . . . . . . .3-16 Figure 3-7. 24-Port Module Faceplate and ONline System
Concentrator (Model Number 5124M-TPCL) . . . . . . . . . . .3-29 Figure 3-8. 24-Port Module Faceplate and ONline System
Concentrator (Model Number 5124M-TP) . . . . . . . . . . . . .3-30 Figure A-1. 24-Port Module RJ-45 Connector Pinouts . . . . . . . . . . . . . A-8 Figure A-2. 50-Pin Male and Female Connectors . . . . . . . . . . . . . . . . . A-9
ONline Ethernet 24-Port 10BASE-T Module Installation Guide ix
x ONline Ethernet 24-Port 10BASE-T Module Installation Guide
Tables
Table 2-1. Seven Basic Network Rules . . . . . . . . . . . . . . . . . . . . . . . . .2-3 Table 2-2. LAN Product Equivalent Distances . . . . . . . . . . . . . . . . . . . .2-6 Table 3-1. Procedures for Completing Installation . . . . . . . . . . . . . . . .3-2 Table 3-2. DIP Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8 Table 3-3. Channel (Network) Select DIP Switch Settings . . . . . . . . . . .3-9 Table 3-4. 24-Port Module LED Interpretations. . . . . . . . . . . . . . . . . .3-31 Table 3-5. Network Check Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-33 Table 4-1. Troubleshooting Using the Port Status LEDs. . . . . . . . . . . . .4-2 Table 4-2. Troubleshooting Using the Port Activity LEDs . . . . . . . . . . . .4-4 Table A-1. 24-Port Module General Specifications. . . . . . . . . . . . . . . . A-2 Table A-2. 24-Port Module Power Specifications. . . . . . . . . . . . . . . . . A-3 Table A-3. 24-Port Module Fuse Specifications . . . . . . . . . . . . . . . . . . A-4 Table A-4. 24-Port Module Environmental Specifications. . . . . . . . . . . A-4 Table A-5. 24-Port Module Mechanical Specifications . . . . . . . . . . . . . A-5 Table A-6. IBM Twisted Pair Cable Specifications . . . . . . . . . . . . . . . . A-6 Table A-7. 50-Pin Cable Pinouts and Port Assignments . . . . . . . . . . . A-10
ONline Ethernet 24-Port 10BASE-T Module Installation Guide xi
How to Use This Guide
This guide tells you how to install and operate the 3Com ONline™ Ethernet 24-Port 10BASE-T Module for the ONline System Concentrator. It also includes information on monitoring this module using an ONline network management module. An appendix explains cabling guidelines and options for this module.
Audience
This guide is intended for the following people at your site:
Network manager or administrator
Hardware installer
ONline Ethernet 24-Port 10BASE-T Module Installation Guide xiii
Structure of This Guide
This guide contains the following chapters:
Chapter 1, Introduction – Introduces the functions and features of the ONline Ethernet 24-Port 10BASE-T Module.
Chapter 2, Designing and Expanding the Network – Shows possible network configurations using the ONline System Concentrator and the ONline Ethernet 24-Port Module.
Chapter 3, Installing and Operating the Module – Provides illustrated procedures for installing the 24-Port Module into the ONline System Concentrator. Also shows front panel LEDs and dip switches on the module and describes network management commands.
Chapter 4, Troubleshooting – Provides help in isolating and correcting problems that may arise when installing or operating this module.
Appendix A, Specifications – Provides electrical, environmental, and mechanical specifications, plus 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
xiv ONline Ethernet 24-Port 10BASE-T Module Installation Guide
Document Conventions
The following document conventions are used in this manual:
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ONline Ethernet 24-Port 10BASE-T Module Installation Guide xv
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Related Documents
This section provides information on supporting documentation, including:
3Com Documents
Reference Documents
xvi ONline Ethernet 24-Port 10BASE-T Module Installation Guide
3Com Documents
The following documents provide additional information on 3Com products:
17-Slot ONline System Concentrator Installation and Operation Guide – Explains how to install, operate, and manage the 3Com ONline 17-Slot System Concentrator (Models 5017C-LS and 5017C with load sharing).
6-Slot ONline System Concentrator Installation and Operation
Guide – Explains how to install, operate, and manage the 3Com ONline 6-Slot System Concentrator.
ONline Ethernet Management Module Installation and Operation Guide –
Describes how to install the ONline Ethernet Management Module in the ONline System Concentrator and explains the LEDs on the module faceplate. This guide also provides instructions for connecting a terminal to the module and describes the management commands necessary to perform management tasks on the concentrator and on remote devices.
ONline Management Commands Guide – Provides an alphabetized reference resource describing all ONline management commands.
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.
ONline Ethernet 24-Port 10BASE-T Module Installation Guide xvii
1Introduction
This chapter introduces you to the 3Com ONline™ Ethernet 24-Port 10BASE-T Modules (Model Numbers 5124M-TPCL and 5124M-TP). The modules are referenced throughout this guide as the 24-Port Module.
You can install both versions of the 24-Port Module in all 3Com ONline System Concentrator and ONcore® Switching Hub models.
This chapter contains the following sections:
Ethernet 24-Port 10BASE-T Module Description
Theory of Operation
Ethernet 24-Port 10BASE-T Module Description
This section describes:
Module Features
Model Number 5124M-TPCL Features
Model Number 5124M-TP Features
Introduction 1 - 1
The ONline Ethernet 24-Port Module is an IEEE 802.3 repeater module that complies with the 10BASE-T standard. It connects up to 24 devices (PCs, terminals, printers, modems) to the ONline System Concentrator.
The 24-Port Module (Model Number 5124M-TPCL and Model Number 5124M-TP) is a bank switching module. Bank switching is the assignment of a group of 12 consecutive ports to a single network, or to an isolated network.
Note: You cannot assign individual ports on the 5124M-TPCL and the 5124M-TP modules to different networks.
Module Features
The ONline Ethernet 24-Port 10BASE-T Module:
Is an IEEE 802.3 repeater module that complies with the 10BASE-T standard.
Connects up to 24 devices (PCs, terminals, printers, modems) to the 3Com ONline System Concentrator or ONcore Switching Hub.
Provides high port density at a low cost per port.
Supports up to 100 meters on 10BASE-T-compliant unshielded twisted pair (UTP) or shielded twisted pair (STP) wiring.
Features “hot swap” capability so that you can install or remove the module without having to power down the concentrator.
Provides bank-switching capability.
Provides a user-selectable autopartition threshold for flexibility in dealing with collision-related network slowdowns.
Allows you to disable Link Integrity so you can connect to equipment that does not conform to the 10BASE-T standard.
1 - 2 ONline Ethernet 24-Port 10BASE-T Module Installation Guide
Is designed with all ports internally crossed over, as required by the 10BASE-T standard. This enables you to connect the 24-Port Module to a 10BASE-T transceiver without using an external crossover adapter.
Bank Switching Capability
Bank switching is the assignment of a group of twelve consecutive ports to a single network, or to an isolated network.
In an unmanaged concentrator you can use DIP switches to:
Assign all module ports to an Ethernet network or to an isolated network
Assign port groups 1 through 12 or 13 through 24 to different Ethernet or isolated networks
In a managed concentrator you can use network management commands to assign the following port “groups” to any of three backplane networks, or to either of two isolated networks:
Ports 1 through 12
Ports 13 through 24
All ports on the module
Model Number 5124M-TPCL Features
Model Number 5124M-TPCL permits you to connect groups of 12 consecutive 10BASE-T-compliant module ports using:
Two 50-pin Telco connectors (one connector attached to 12 ports)
Two 25-pair 10BASE-T cables or two 12-leg “hydra” cables (one cable per 12 ports)
Introduction 1 - 3
Model Number 5124M-TP Features
Model Number 5124M-TP permits you to connect individual 10BASE-T-compliant ports using 24 RJ-45 connectors (one connector per port). The RJ-45 connectors provide direct connections to 10BASE-T cables (one cable per connected port).
Theory of Operation
ONline Ethernet 24-Port 10BASE-T Modules incorporate repeaters and twisted pair transceivers that receive and restore amplitude to incoming signals. 24-Port Module repeaters restore phase and frequency.
Repeated signals:
Synchronize to the system clock
Enter on the TriChannel® backplane of the ONline System Concentrator.
Outgoing signals from the TriChannel backplane are:
Sent directly to transceivers
Transmitted to twisted pair link segments by the transceivers
1 - 4 ONline Ethernet 24-Port 10BASE-T Module Installation Guide
Figure 1-1 shows a 24-Port Module (Model Number 5124M-TPCL) connected to nodes by means of bundled 25-pair or 12-leg hydra cables and patch panels.
Concentrator
End Nodes
Patch Panels
Figure 1-1. Typical 24-Port Module Configuration
Introduction 1 - 5
2Designing and
Expanding the Network
This chapter contains configuration information to help you design your network. It describes how to configure networks using the ONline System Concentrator and ONline Ethernet 24-Port 10BASE-T Modules. It also provides examples of network cabling structures and Ethernet network cabling solutions.
This chapter contains the following sections:
Understanding the General Rules
Choosing a Network Backbone Cabling Structure
24-Port Module Configurations
Using Patch Panels
Establishing Fault-Tolerant Configurations
Note: To ensure proper operation of your network, install all equipment using only approved cables. Refer to Appendix A for information on cable requirements.
Designing and Expanding the Network 2 - 1
Understanding the General Rules
This section describes general rules for configuring an Ethernet network using fiber as the backbone medium. It also provides rules to ensure that your network configuration conforms to distance limitations imposed by Ethernet and networking equipment. Use these guidelines for building your network.
Refer to the sections that follow for specific rules for:
Determining maximum 24-Port Module fiber link distances
Connecting various horizontal media types (10BASE-FB, twisted pair) to a 10BASE-FB backbone
Examples of recommended fault-tolerant configurations
This section describes:
Rules for Configuring a Network
Calculating Equivalent Fiber Distances
Rules for Configuring a Network
This section outlines seven basic network rules and 3Com recommendations for building an Ethernet network.
2 - 2 ONline Ethernet 24-Port 10BASE-T Module Installation Guide
For more hardware-specific information on the 24-Port Module, refer to Appendix A.
Table 2-1. Seven Basic Network Rules
Rule |
Definition |
Recommendations/Notes |
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|
|
1 |
If possible, use |
Use 62.5 micron cable to conform |
|
10BASE-FB as the |
with the IEEE 10BASE-F and |
|
backbone medium. |
upcoming ANSI FDDI standards. |
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Use ST-type connectors. |
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2 |
Wire the backbone in |
Make sure to lay extra fiber |
|
a star topology to |
cables. The extra cost is small and |
|
isolate faults. |
you will find you need them as |
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|
your network grows. |
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The star topology conforms to |
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FDDI wiring as well -- just make |
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sure to run at least two fiber |
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strands to every backbone |
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connection. |
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3 |
The maximum Fiber |
The 4200 meters is the maximum |
|
Ethernet network |
distance between any two |
|
diameter is 4200 |
transceivers on the network. |
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meters of fiber cable. |
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The 4200 meters does not include |
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the transceiver cable (that is, drop |
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or patch cable) that connects a |
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device with an external |
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transceiver. Transceiver cables |
|
|
can extend up to 50 meters. Thus, |
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total network diameter can be as |
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much as 4300 meters (4200 m + 2 |
|
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* 50 m) between any two nodes. |
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Designing and Expanding the Network 2 - 3
Table 2-1. Seven Basic Network Rules (Continued)
Rule |
Definition |
Recommendations/Notes |
|
|
|
4 |
Certain LAN devices |
Many LAN products delay the signal |
|
on the network shrink |
that goes through them. This is |
|
the maximum Fiber |
known as equivalent distance. Every |
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Ethernet network |
microsecond delay reduces the |
|
diameter to less than |
maximum link distance. In fact, |
|
4200 meters. |
every microsecond delay shrinks the |
|
|
network diameter by approximately |
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200 meters of fiber cable. Table 2-2 |
|
|
lists the Equivalent Distances for |
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other 3Com products. |
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5 |
Assume that one |
This is a conservative rule. For |
|
meter of coaxial or |
example, the actual equivalence is |
|
twisted pair is equal to |
about 1.1 meters of coaxial for |
|
one meter of fiber |
every meter of fiber. For simplicity, |
|
cable. |
assume one meter. |
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|
|
2 - 4 ONline Ethernet 24-Port 10BASE-T Module Installation Guide
Table 2-1. Seven Basic Network Rules (Continued)
Rule |
Definition |
Recommendations/Notes |
|
|
|
6 |
The fiber link distances |
In general, on 62.5 micron cable, |
|
must not exceed the |
you can go up to 4000 meters |
|
limits imposed by the |
point-to-point using the ONcore or |
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optical power budget. |
ONline Fiber Modules. If you have |
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poor quality cable or cross many |
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patch panels, you may have to |
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sacrifice some distance. |
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Some older Ethernet fiber optic |
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products are less powerful than |
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ONcore Fiber Module optics. So |
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when connecting to these |
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products, remember that the least |
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powerful device determines the |
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maximum point-to-point distance. |
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7 |
When in doubt, use a |
If you are not certain if you have |
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bridge. |
exceeded allowable network |
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distances, use a bridge to extend |
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the network. |
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Designing and Expanding the Network 2 - 5
LAN Equivalence
LAN equivalence is the sum of both the incoming and outgoing module port signals. Different modules, however, have different equivalent distances. Table 2-2 lists the LAN product equivalent distances.
Table 2-2. LAN Product Equivalent Distances
LAN Product |
Equivalent |
|
Distance (meters) |
||
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||
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|
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ONcore Ethernet 10-Port 10BASE-FB Module |
190 |
|
|
|
|
Incoming signal to fiber port |
140 |
|
|
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Outgoing signal from fiber port |
50 |
|
|
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|
ONcore Ethernet 10BASE-T Module |
585 |
|
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Incoming signal to TP port |
420 |
|
|
|
|
Outgoing signal from TP port |
165 |
|
|
|
|
ONline Ethernet 10BASE-T Modules |
585 |
|
|
|
|
Incoming signal to TP port |
420 |
|
|
|
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Outgoing signal from TP port |
165 |
|
|
|
|
ONline Ethernet Fiber or 10BASE-FB Modules |
190 |
|
|
|
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Incoming signal to fiber port |
140 |
|
|
|
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Outgoing signal from fiber port |
50 |
|
|
|
|
ONline Ethernet FOIRL Module |
560 |
|
|
|
|
Incoming signal to fiber port |
330 |
|
|
|
|
Outgoing signal from fiber port |
230 |
|
|
|
|
ONline Ethernet Transceiver Module |
0 |
|
|
|
|
ORnet Star Coupler (8 or 14 port) 26 |
180 |
|
|
|
2 - 6 ONline Ethernet 24-Port 10BASE-T Module Installation Guide
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