3Com 5104M-FL1 User Manual

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ONline Ether net 10BASE -FL

Module Installation and

Operation Guide

Document Number 17-00470-3

Printed March 1995

Model Number: 5104M-FL1

3Com Co rporation 118 Turnpike Road

Southbo rough, MA 0177 2-1886

U.S.A.

(508) 46 0- 8900

FAX (508) 460-8950

Federal Communications Comm ission 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 i s 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 rad io communications. Operation of this equipment in a residential area is likely to cause harmful interfer ence, 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.

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 V oluntary Control Council for Inter fere nce 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, r adio interferenc e 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 cable classified by Underwriters Laboratories as to fire and smoke char acteristics in accordance with Section 770-2(b) and Section 725-2(b) of the National Electrical Code.

VDE Class B Compl ianc e

Hiermit wird bescheinigt, dass der 5104M-FL1 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 5104M-FL1 is shield ed 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 Com p lian ce

This equipment conforms to the Class A emissions limits for a digital device as defin ed by EN55022 (CISPR22).

UK General Approval Statem en t

The ONcore Switching Hub, ONline System Concentrator, and ONsemble StackSyste m Hub are manufactur ed to the International Safety Standard EN 60950 and are approve d in the UK under the Genera l 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.

1995, by 3Com Corporation. Printed in U.S.A. All rights r eserved. 3Com 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 man ufacture the products. It is not our intent to claim these names or trademarks as our own.

ii ONline Ethernet 10BASE-FL Module Installation and Operation Guide

Artel, Chipcom, Ethermodem, Galactica, ONcore, ORnet, StarBridge, and TriChannel are regi stered trademarks of 3Com Corporation.

Chipcom OpenHub, G-Man, LANsentry, MultiProbe, ONdemand, ONline, ONsemble, PowerRing, SL2000, SL3000, SL40 00, StackJack, StackSystem, and SwitchC entral are trademarks of 3Com Corporation.

The Chipcom Multichannel Architecture Communications System is registered under U.S. Patent Number 5,301,303.

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. Restricted Rights

XNS is a trade mark a nd Ethernet is a r egistered trademark of Xerox Corporation.

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, Ether Link Plus, EtherLink II, TokenLink, T okenLink 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 register ed i n other countrie s. Other brand and product names may be reg istered tradema rks or trademark s of their respective holders.

Use, duplication, or disclosure by the Government is s ubject 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 10BASE-FL Module In st al lation and Operation Guide iii

iv ONline Ethernet 10BASE-FL M odule Installation and Operation Guide

How to Use This Guide

Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii i

Structure of This Guid e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xiv

Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv

Text Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv

Notes, Cautions, and Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xv i

Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xvi

3Com Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xvi

Reference Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii

Chapter 1 — Introduction

10BASE-FL Module Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

10BASE-FL and FOIRL IEEE Standards Comparison . . . . . . . . . . . . . . . . . 1-2

Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Contents

Chapter 2 — Designing and Expanding the Network

Understanding th e General Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Basic Network Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

LAN Equivalence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Determining Maximum 10BASE-FL Link Distances . . . . . . . . . . . . . . . . . . 2-6

Calculating Maxim u m Lin k Distance . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Determining Link Bu dget . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Splicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Optical Fiber Loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Maximum Link Distance Calc ulati on . . . . . . . . . . . . . . . . . . . . . 2-10

Choosing a Netwo rk Backbone Cabling Structure . . . . . . . . . . . . . . . . . 2 -13

Star Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Serial Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

10BASE-FL M od ule Co nf igu rations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

ONline Ethernet 10BASE-FL Module In stallation and Operation Guide v

10BASE-FL Bac kbon e , 10BASE-F L to-the-D e s k . . . . . . . . . . . . . . . . 2-16

Network Distance Calculation Example s . . . . . . . . . . . . . . . . . . 2-18

10BASE-FL Backbone, Unshielded Twisted Pair to-the-Desk . . . . . . 2 -20

10BASE-FB Fiber Bac kbon e, 10BASE-FL to-the-D e sk . . . . . . . . . . . . 2-23

Connecting Extern al Networ k Devices . . . . . . . . . . . . . . . . . . . . . . . . . 2-25

Fault-Tolerant Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

Configuring Ports for Fault Tolerance . . . . . . . . . . . . . . . . . . . . . . . 2-28

Implementing Bac kbo ne Cabl e Plant Fault Toleranc e . . . . . . . . . . . 2-28

Setting Redundanc y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

Remote Failure Signaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30

Implementing Tot al Backbone Fault Toleran ce . . . . . . . . . . . . . . . . 2 -31

Chapter 3 — Installing and Operating the Module

Precautionary Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Unpacking Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Quick Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Setting the Dip Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Setting Dip Switch SW1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Setting Dip Switch SW2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Installing the Modul e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Configuring the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 -11

Enabling Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 -12

Selecting a Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Enabling Port Redun danc y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

Enabling Remote Failure Sig nalin g . . . . . . . . . . . . . . . . . . . . . . . . . 3 -14

Saving Module Config uration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Showing Mod ule Co nfi gu ration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

Monitoring the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

Verifying the LED and Networ k Assignm ent s . . . . . . . . . . . . . . . . . . . . 3 -19

Chapter 4 — Troubleshooting

Troubleshooting Using the Port Activity LEDs . . . . . . . . . . . . . . . . . . . . . 4-2

Troubleshooting Using the Port Status LEDs . . . . . . . . . . . . . . . . . . . . . . 4-3

RFS Troub leshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

vi ONline Eth ernet 10BASE-FL Mod ule Installation and Operation Guide

Appendix A — Specifications

General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1

Optical Specification s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2

Transmitter Specificatio ns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2

Receiver Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-3

Supported Fiber Opt ic Cab le s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-3

Fiber Optic Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Power Requiremen t s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Environmental Spec ific ation s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Mechanical Specificatio ns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-5

10BASE-FL Cable and Con nect or Spec ificat ion s . . . . . . . . . . . . . . . . . . .A-5

Fiber Cables and Connector s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6

Fiber Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-6

Fiber Connector s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6

Connecting Fib er Cabl es . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-7

Appendix B — Technical Support

On-line Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Email Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

World Wide Web Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Support from Your Netw ork Sup plier . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Support from 3Com . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Returning Produ cts for Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4

Accessing the 3Com MIB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4

3Com Technical Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5

Index

ONline Ethernet 10BASE-FL Module Installation and Operation Guid e vii

viii ONline Ethernet 10BASE-FL Module Installation and Operation Guide

Figures

Figure 1-1. 10BASE-FL Mod ule Co nn ectio n s . . . . . . . . . . . . . . . . . . . 1-4

Figure 2-1. 2000 Meter Fiber Link With Mechanical Spl ice . . . . . . . 2-11

Figure 2-2. 1700 Meter Fiber Link Through Two Patch Panels . . . . . 2-12

Figure 2-3. Star-Wiring Configuration . . . . . . . . . . . . . . . . . . . . . . . 2-14

Figure 2-4. Serial Configuration Usin g 10BA SE-FL Modules . . . . . . . 2-15

Figure 2-5. All-10BASE-FL N etwo rk wi th 3 Con centr ator s . . . . . . . . 2-17

Figure 2-6. Network with 6 Concentrators . . . . . . . . . . . . . . . . . . . 2-19

Figure 2-7. Sample Configu ratio n Dist ance Calc ulati on . . . . . . . . . . 2-22

Figure 2-8. Sample Fiber Backbon e, 10 BASE-FL to-the-Desk

Figure 2-9. Thin Ethernet Segment Connecting to ONline Using an

Figure 2-10. Redundant Fiber Backbon e Co nfig uration . . . . . . . . . . . 2-29

Figure 2-11. Total Backbone Fault-Toleran t Conf iguration . . . . . . . . 2-31

Figure 2-12. Network With 3 Con cent rators . . . . . . . . . . . . . . . . . . . 2-32

Figure 3-1. 10BASE-FL Module Di p Switch Locations . . . . . . . . . . . . 3-5

Figure 3-2. Installing the 10BASE-FL Module . . . . . . . . . . . . . . . . . . . 3-9

Figure 3-3. 10BASE-FL Mod ule Co nn ectio n . . . . . . . . . . . . . . . . . . 3-10

Figure 3-4. 10BASE-FL M odules Connected w ith Redundancy/R FS

Figure 3-5. 10BASE-FL Module Faceplate and ONline System

Concentrato r . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

Configur ation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24

IEEE Repeater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26

Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

ONline Ethernet 10BASE-FL Module In st al lation and Operation Guide ix

x ONline Ether net 10BASE-FL Module Installation and Operatio n Guide

Tables

Table 1-1. 10BASE-F Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Table 2-1. Seven Basic Network Rules. . . . . . . . . . . . . . . . . . . . . . . . 2-2

Table 2-2. LAN Product Equivalent Distance s . . . . . . . . . . . . . . . . . . 2-5

Table 2-3. 10BASE-FL Module Optical Power Budg et . . . . . . . . . . . . 2-8

Table 2-4. Connector and Splice Insertion Loss. . . . . . . . . . . . . . . . . 2-9

Table 2-5. Typical Fiber Loss Characteristics . . . . . . . . . . . . . . . . . . 2-10

Table 2-6. Fiber Equivalent Distances Between Transceivers . . . . . . 2-20

Table 3-1. Quick Installation Procedures . . . . . . . . . . . . . . . . . . . . . . 3-3

Table 3-2. Dip Switch SW1 Settings . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Table 3-3. Dip Switch SW2 Settings for Switches 1 to 4 . . . . . . . . . . 3-7

Table 3-4. Dip Switch SW2 Settings for Switches 5 and 6. . . . . . . . . 3-8

Table 3-5. Interpreting the 10BASE-FL Module LED s . . . . . . . . . . . . 3 -18

Table 3-6. Network Check Codes . . . . . . . . . . . . . . . . . . . . . . . . . . 3 -19

Table 4-1. Troubleshooting Using the Port Activity LEDs . . . . . . . . . . 4-2

Table 4-2. Troubleshooting Using the Port Status LEDs. . . . . . . . . . . 4-3

Table A-1. General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1

Table A-2. Transmit Power (Peak Values) . . . . . . . . . . . . . . . . . . . . .A-3

Table A-3. Receiver Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

Table A-4. Fiber O ptic Interface Specifications. . . . . . . . . . . . . . . . . .A-4

Table A-5. Power Requiremen t s . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Table A-6. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .A-5

Table A-7. Mechanical Specificatio ns . . . . . . . . . . . . . . . . . . . . . . . . A-5

Table A-8. Connector Type Part Number. . . . . . . . . . . . . . . . . . . . . .A-6

ONline Ethernet 10BASE-FL Module In st al lation and Operation Guide xi

This guide is designed to help you understand the features, indicators, and installation procedure for the 3Com ONline™ Ethernet 10BASE-FL Module (Model Number 5104M-FL1). Information on troubleshooting and diagnostics are included. This guide also contains network configuration information.

Audience

This guide is intended for the following p eople at your site:

How to Use This Guide

❑ Network manager or administrator ❑ Hardware installer

ONline Ethernet 10BASE-FL Module Installation and Operation Guide xiii

Structure of This Guide

This guide contains the following chap ters and appendix: Chapter 1 - Introduction – Introduces the principal features of the

ONline Ethernet 10BA SE- FL Module. Chapter 2 - Designing and Expanding the Netw ork – Shows and

explains examples of network configurations using the ONline System Concentrator and the ONline 10BASE-FL Module.

Chapter 3 - Installing and Operating the Module – Provides illustrated procedures for installing the 10BASE-FL Module into the ONline System Concentrator.

Chapter 4 - Troubleshootin g – Pr ovides help in isolating and correcting problems that may arise during the installation process and during normal operation.

Appendix A - Specifications – Provides product dimensions, power requirements, and other specifications for the module.

Appendix B - Technical Support – Li st s th e various methods for contacting the 3Com technical support organization and for accessing other product support services.

Index

xiv ONline Eth er net 10BASE-FL Module Installation and Operation Guide

Document Conventions

This section describes document conventions.

Text Conventions

Text Convention Example

System output Courier text After you click App ly, the system

User input In the Agent I nformation Form,

displays the message Transmitting Data.

enter Support in the New Contact field.

Pathnames, Filenames

User -substituted identifiers

Key or key sequence

Button Click Cancel. Menu selection To save the configuration, select

Text emphasis, Document tit les

Plain text Before y ou begin, read the

readme.txt file located in /usr/snm/agents.

Italic text in braces

Initial-capitalized plain text

Italic text Click Apply after you add the

Use the following command to show port details:

SHOW PORT {

To refresh the screen, press Ctrl-R.

File→Save.

new search parameters.

slot

.all} VERBOSE

ONline Ethernet 10BASE-FL Module Installation and Operation Guid e xv

Notes, Cautions, and Warnings

A note indicates information that is important:

Note: Use STP lobe cables for your system.

A caution indicates a condition that may dam a ge software or hardware:

Caution: Do not put your installation diskettes on a magnetic

surface. This may damage the diskettes.

A warning indicates a condition that may threaten personal safety:

Warning: Wear eye protection w hen performing the following

maintenance procedures.

10BASE-FL Module Description

The ONline Ethernet 10BASE-FL Module is a 4-port, fiber repeater module designed for the 3Com ONline System Concentrator . The module provides 10BASE-FL backbone connectivity for Ethernet local area networks. It also provides direct 10BASE-FL to-the-desk connectivity.

The 10BASE-FL Module:

❑ Meets the 802.3 distance recommendation of two kilometers

between any two concentrators

❑ Supports network diameters up to 4 kilometers ❑ Contains built-in link redundancy fo r fault tolerance ❑ Includes extensive diagnostics for rapid troubleshooting ❑ Provides 10 Mbps performance with 100 percent collision detection

using CSMA/CD

❑ Provides backward compatibility with FOIRL-compliant equipment ❑ Supports 50 , 62.5, 85, and 100 µm fiber cable ❑ Is shipped with ST, SMA, or FC connectors ❑ Features “hot swap” cap ability

Before installing the 10BA SE- FL Module, read the ONline System Concentrator In stallation and Operation Guide.

1 - 2 ONline Ethernet 10BASE-FL Inst allation and Operation Guide

10BASE-FL and FOIRL IEEE Standards Comparison

10BASE-FL is a subpart of a IEEE standard called 10BASE-F (802.3, section

18), which standardizes three types of Ethernet-over-fiber optic cable. Table 1-1 describes each 10BASE-F standard

Table 1-1. 110BASE-F Standards

10BASE-F Standard Description

10BASE-FB “FB”indicates “fiber backbone.” Th e optimal

use for this version of fiber Ethernet is as a fiber backbone.

10BASE-FP “FP” indicates “fi ber passive” network. This

standard specifies a fiber optic connection method that passively splits the fiber optic light from each station among all the others, entirely within the optical domain.

10BASE-FL “FL” indicates “fiber link.” A superset of the

1987 IEEE FOIRL standard, the 10BASE-FL standard ensures compatibility between FOIRL and 10BASE-FL equipment. However, observe the more limiting FOIRL parameters if you interoperate with FOIRL-compliant equipment.

Theory of Operatio n

Use the 10BASE-FL Module to connect directly to a 10BASE-FL or FOIRL-compatible device (such as the 3Com model 5101T-FL1 10BASE-FL Transceiver). However, you can also use the module as your network backbone link for connecting concentrators together. Connections of both types are shown in Figure 1-1

Introduction 1 - 3

Figure 1-1. 10BASE-FL Module Connections

1 - 4 ONline Ethernet 10BASE-FL Inst allation and Operation Guide

Designing and

Expanding the Network

This chapter contains configuration information that will help you to plan your network. Install all equipment using only approved cables for proper operation. Refer to Appendix A, the section Fiber Cables and Connectors, for information on fiber cable and connector requirements.

This chapter contains the following sections:

❑ Understanding the General Rules ❑ Determining Maximum 10BASE-FL Link Distances ❑ Choosing a Network Backbone Cabling Structure ❑ 10BASE-FL Module Configurations ❑ Connecting External Network Devices ❑ Fault-Tolerant Configurations

Designing and Ex panding the Networ k 2 - 1

Understandi ng 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 10BASE-FL fiber link distances ❑ Connecting various horizontal media types (10BASE-FL, 10BASE-T) to

a 10BASE-FL backbone

❑ Examples of recommended fault-tolerant configurations

Basic Network Rules

This section outlines the basic network rules and the 3Com recommendations for these rules. For additional hardware-specific information on this module, refer to Appendix A.

T able 2-1 outlines the seven basic rules to keep in mind when you construct your network.

Table 2-1. Seven Basic Network Rules

Rule Definition Recommendations/Notes

1 If pos sible, use

10BASE-FB as the backbone medium.

2 - 2 ONline Ethernet 10BASE-FL Inst allation and Operation Guide

Use 62.5 micron cable to conform with the IEEE 10BASE-F and upcoming ANSI FDDI standards.

Use ST-type connect ors.

Table 2-1. Seven Basic Network Rules (Continued)

Rule Definition Recommendations/Notes

2 Wire the backbone in

a star topology to isolate faults.

3 The maximum Fiber

Ethernet network diameter is 4200 meters of fiber cable.

4 Certain LAN devices

on the network shrink the maximum Fib er Ethernet network diameter to less than 4200 meters.

Make sure to lay extra fiber cables. The extra cost is small and you will find you need them as your network grows.

The star topology confo rm s to FDDI wiring as well -- just make sure to run at least two fiber strands to every backbone connection.

The 4200 meters is the maximum distance between any two transceivers on the network.

The 4200 meters does not include the transceiver cable (that is, drop or patch cable) that connects a device wi th an external transceiver. Transceiver cables can extend up to 50 meters. Thus, total network diameter can be as much as 4300 meters (4200 m + 2 * 50 m) between any two nodes.

Many LAN product s delay th e sig nal that goes through them. This is known as equivalent distance. Every microsecond delay reduces the maximum link distance. In fact, every microsecond delay shrinks the network diameter by approximately 200 meters of fiber cable. Table 2-2 lists the Equivalent Distances for other 3Com products.

Designing and Ex panding the Networ k 2 - 3

Table 2-1. Seven Basic Network Rules (Continued)

Rule Definition Recommendations/Notes

5 Assume that one

meter of coaxial or twisted pair is equal to one meter of fiber cable.

6 The fiber link distances

must not exceed the limits imposed by the optical power budget.

This is a conservative rule of thumb. For example, the actual equivalence is about 1.1 meters of coaxial for every meter of fiber. For simplicity, assume one meter.

In general, on 62.5 micron cable, you can go up to 4000 meters point-to-point using the ONcore or ONline Fiber Modules. If you have poor quality cable or cross many patch panels, you may have to sacrifice some distance.

Some older Ethernet fiber optic products are less powerful than ONcore Fiber Module optics. So when connecting to these products, remember that the least powerful device determines the maximum point-to-point distance.

7 When in doubt, use a

bridge.

2 - 4 ONline Ethernet 10BASE-FL Inst allation and Operation Guide

If you are not certain if you have exceeded allowable network distances, use a bridge to extend the network.

LAN Equivalence

LAN equivalenc e is the sum of both t he incoming and out going 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

ONcore or ONline Ethernet 10BASE-FB Modules 190

Incoming sig nal to fiber port 140

Outgoing signal from fiber port 50

ONcore or ONline Ethernet 10BASE-T Modules 585

Incoming sig nal to twisted pair port 420

Outgoing signal from twisted pair port 165

ONline Ethernet FOIRL Module 560

Incoming sig nal to fiber port 330

Outgoing signal from fiber port 230

ONline Ethernet Transceiver Module 0 ONline Ethernet BNC Module 900

Incoming sig nal to BNC port 450

Outgoing signal from BNC port 450

Equivalent

Distance (meters)

ONline Ethernet Repeater Module 800

Incoming sig nal to AUI port 600

Outgoing signal from AUI port 200

IEEE Repeater 800

Designing and Ex panding the Networ k 2 - 5

Determining Maximum 10B ASE-FL Link Distanc es

This section describes how to c alculate the maximum allowable link distances between two 10BASE-FL ports.

To do this, you must know the following information:

❑ 10BASE-FL Module optical (link) power budget ❑ Fiber cable diameter (for example, 50 micron, 62.5 micron) ❑ Fiber cable light loss/km (for example, 3 dB loss/km) ❑ Number of pat ch panel connections between ports ❑ Number of splices on the link

The following tables assist you in obtaining this informatio n:

❑ Table 2-3 - Outlines the optical power budget for the 10BASE-FL

Module.

❑ Table 2-4 - Lists typical losses for various connector types. ❑ Table 2-5 - Lists typical losses for various fiber cables.

Calculating Maximum Link Distance

To calculate the maximum link distance allowed:

1. Determine the optical power budget for the 10BASE-FL p ort (Table 2-3).

2. Subtract the op tical power loss due to patch panels and splices (Table 2-4) from the optical power budget for the 10BASE-FL port.

3. Subtract the dB loss/km rating of the fiber cable (T able 2-5) from the remainder of Step 2. If the result is greater than 0 dbm, the lin k distance is valid.

2 - 6 ONline Ethernet 10BASE-FL Inst allation and Operation Guide

Determining Link Budget

As a network planner or installer , account for worst case losses through the optical connection, end-to-end, to ensure link integrity . The optical power budget represents a “worst case” assuming the transmitter is transmitting at the low end of its range.

Adhere to the IEEE 802.3 10BASE-FL specification which states that the minimum distance supported between two 10BASE-FL ports is 2 kilometers.

If the link between two 10BASE-FL ports is:

❑ Less than 2 kilometers and contains minimal losses (that is, only one

splice or connector and typical fiber cab le attenuation) you do not need to calculate the optical budget for the link.

❑ If you must exceed 2 kilometers, or if you have multiple splices in the

cable, you must calculate the optical power budget.

Note: When connecting a 10BASE-FL product to an FOIRL

product, do not exceed the 1 kilometer maximum distance defined by the 802.3 FOIRL specification. Because 10BASE-FL is backw a rd compatible with FOIRL , yo u can make mixed 10BASE-FL/FOIRL connections. However , to interoperate 10BASE-FL and FOIRL equipment, observe the more limiting restrictions of the FOIRL specification.

T able 2-3 provides the Transmit Optical Power ranges and required Receiver Optical Power sensitivity levels for the 10BASE-FL Module.

Designing and Ex panding the Networ k 2 - 7

Note: The values in Table 2-3 are peak power values. You

determine average o ptical power by subtr acting 3 dBm from the peak value. All of the exam ples provid ed in the pages that follow refer to peak optical power. Note that higher optical power is represented by a smaller negative number (for example, -12 dBm is greater than -20 dBm).

Table 2-3. 10BASE-FL Module Optical Power Budget

Cable Si ze

Used

(microns)

50/125

T rans mit

Pow e r

(dBm)

(Peak)

-16.5 ± 3.0 -8.0 to -29.5 10.0 None

Receive

Power

Range

(dBm) (Peak)

Optical

Power

Budget

(dB)

NA 0.20

62.5/125

-12.0 ± 3.0 -8.0 to -29.5 14.5 None

NA 0.275

85/125

-9.0 ± 3.0 -8.0 to -29.5 17.5 >2.0 dB

NA 0.29 100/140

-6.5 ± 3.0 -8.0 to -29.5 20.0 >4.5 dB

NA 0.29

Atte nua tion

It is possible for receivers to receive too m uch light when:

❑ Using 85/12 5 and 100/140 micron fiber cables

Lin k Loss Required

(dB)

(ONline to

ONline)

❑ Ports are close together on a link

2 - 8 ONline Ethernet 10BASE-FL Inst allation and Operation Guide

In such cases, some attenuation is required to prevent this problem. This attenuation is usually covered by:

❑ A moderate link length ❑ The fiber optic connectors

Splicing

Many fiber optic installations employ the use of patch p anels to manage expansion and topological changes. A typical patch panel consists of a set of female-to-female bulkhead barrel connectors used to connect male fiber connectors on both sides. The optical power loss through a patch panel includes two c onnectors and a bulkhead.

If a fiber optic cable breaks, the break is usually fixed by splicing the broken ends together. Use one of the following types of splicing:

❑ Fusion - A fusion splice usually offers lower power loss, but the

fusion equip ment is often bulky and costly.

❑ Mechanical - A mechanical splice can be conveniently used in the

field when a fusion splice is not available. If a repair is made, make sure that the fiber cable still meets the power loss guidelines.

Designing and Ex panding the Networ k 2 - 9

Table 2-4 shows the range of loss and the typical loss as a result of splice.

Table 2-4. Connector and Splice Insertion Loss

Connector Type

SMA Patch Panel 1.0 to 3.0 2.0 ST or FC Patch Panel 0.1 to 0.75 0.5

Splice Type Range of Loss (dB) Typical Loss (dB)

Fusion 0.01 to 0.1 0.05 Mechanical 0.2 to 1.0 0.5

Range of Loss Per

Pair (dB)

Typical Loss (dB)

Optical Fiber Loss

Even though fiber optic cable can carry light signals over a long distance, optical power loss is a significant factor. Check your cable manufacturer's rating of the loss characteristic of your fiber cable to determine the actual loss.

Table 2-5 shows typical power losses in fiber optic cables.

Table 2-5. T y pical Fiber Loss Characteristics

Fiber Type @ 850 nM Loss (dB/km) Typical Loss (dB/km)

50/125 micron 3 to 5 3.75

62.5/125 micron 3 to 5 3.75 85/125 micron 3 to 6 4.0 100/140 micron 3 to 6 5.0

2 - 10 ONline Ethernet 10BASE-FL Installation and Operation Guide

Maximum Link Distance Calculation

The following examples use the information provided in the previous pages to calculate the maximum allowable fiber optic link distance between two ports.

Example: Fiber Link With Mechanical Splice

In the following example, two ONline Concentrators are connected using fiber. If we use 62.5/125 fiber cable, the optical power budget according to T able 2-3 is 14.5 dB. Figure 2-1 shows an example of a 2000 meter fiber link with a mechanical splice.

2000 meters

Mechanical Splice

2.0 km Fiber Cable =

1 Mechanical Splice =

Path Loss =

10 dB loss worst case using 5 dB /km loss fiber cable

1 dB loss worst case

11 dB

Figure 2-1. 2000 Meter Fiber Link With Mechanical Splice

The total path loss is 11 dB. Because the overall power budget is 14.5 dB, this leaves 3.5 dB to spare, so the link can be made.

Ensure you do not overdrive a receiver (that is, the receive d optical power level is not greater than the maximum receive sensitivity level of the fiber connector). In this case, the maximum possible transmit power, -12 dB + 3.0 dB = -9 dB (see T able 2-3). The power loss over the link is 11 dB. This means that the power level of the signal will drop to -20.0 dB by the time it reaches the receiver. Because the maximum receiver sensitivity is -8.0 dB, there is no overdrive problem.

Designing and Expanding the Network 2 - 11

Example: Fiber Link Through Patch Panels

Figure 2-2 illustrates two ONline Concentrators are separated by 1700 meters of fiber cable with two patch panels in between. If we use 50/125 fiber cable, the optical power budget according to Table 2-3 is 10.0 dB.

1700 m eters

Patch Panel

Connectors Connectors

Patch Panel

1.7 Km F iber Cable Two ST P atch Panel

8.5 dB loss worst case using 5 dB/Km loss fiber cable

1.5 dB loss w o rst case

10.0 dBPa th L o s s

Figure 2-2. 1700 Meter Fiber Link Through Two Patch Panels

Total path loss in this example is 10 dB. Because the overall optical power budget for 50/125 cable is 10.0 dB, this leaves 0 dB to spare.

In addition, the received optical power is on the outer edge of the specification. As defined in Table 2-3, the peak received power range for 50/125 cable is -29.5 dB. Adding the path loss of 10.0 dB to -19.5 dB equals

-29.5. This may cause the 10BASE-FL Module Port Status LED to signal a no light

condition. If a no light condition occurs, you must reduce the optical path loss by shortening the cable or by eliminating some of the optical connectors.

2 - 12 ONline Ethernet 10BASE-FL Installation and Operation Guide

Choosing a Netw ork Bac kb o ne Cabling Structure

Because of fiber's long-distance capabilities and immunity to noise, 3Com strongly recommends using fiber as the backbone. You can choose between two fundamental configuration topologies when connecting your network backbo ne using 10BASE-FL Modules in the ONlin e System Concentrator:

❑ Star Configuration ❑ Serial Configuration

Star Configuration

Wire your network in a star configuration using an ONline System Concentrator as the central point in the network. Wiring in a star topology configuration has two major benefits:

❑ Faults in the cable pl ant affect only a piece of the network ❑ You can easily expand the size of your network

Figure 2-3 shows an example of a star-wired configuration

Designing and Expanding the Network 2 - 13

Figure 2-3. Star-Wiring Configuration

Serial Configuration

Use a serial configuration (Figure 2-4) for smaller diameter networks that are not expected to grow. Serial configurations reduce the overall network diameter (by 560 meters for each concentrator in any path)

2 - 14 ONline Ethernet 10BASE-FL Installation and Operation Guide

Figure 2-4. Serial Configuration Using 10BASE-FL Modules

10BASE-FL Module Configurations

The theoretical maximum diameter of an all fiber Ethernet netwo rk is limited to 4.2 km as defined by the 51.2 µsec slottime that is specified for the round trip-delay budget set by the IEEE 802.3 CSMA/CD protoco l . (Thus, point-to-point link distances are limited to a maximum of 4.2 km.) This section describes how to define total network size based on the limits of IEEE 802.3 collision detection.

Designing and Expanding the Network 2 - 15

This section describes the following scenarios:

❑ 10BASE-FL Backbone, 10BASE-FL to-the-Desk ❑ 10BASE-FL Backbone, Unshielded Twisted Pair to-the-Desk ❑ 10BASE-FB Backb one, 10BASE-FL to-th e-Desk

10BASE-FL Backbone, 10BASE-FL to-the-Desk

When designing an all-10BASE-FL network, keep the following rules in mind:

1. Limit the longest ideal path between any two network stations to 4200 meters due to the IEEE slottime of 51.2 µsec.

2. Limit the length of an 10BASE-FL segment by the optical budget of the link and the overall size of the netwo rk. The 802.3 10BASE-FL specification sets 10BASE-FL link distances to 2 km. However , you can generally extend the length if you compute the optical budget and take end-to-end timing into consideration.

3. Each 10BASE-FL Module in a serial path between the two transceivers reduces the maximum cable distance between them by 560 meters (1836 feet). To be accurate, the equivalent fiber distance is:

❑ 330 meters for signals that externally enter a 10BASE-FL Module

port and go through the backplane

❑ 230 meters for signals that internally enter a 10BASE-FL Module

using the ONline Concentrator backplane

❑ 560 meters for signals that extern ally enter and then exit the

same 10BASE-FL M od ule

For simplicity, use 560 meters per 10BASE-FL Module in the path, regardless of the signal's direction, when calculati ng fiber equivalent distances. Note, however, that this limits the network diameter to less than the maximum size.

2 - 16 ONline Ethernet 10BASE-FL Installation and Operation Guide

4. Each 10BASE-FL Module counts as one half of a repeater. The 802.3 specification limits the number of repeaters between any two network stations to 4. This restricts the number of serially-connected 10BASE-FL Mo dules to a maximum of 8.

Note: The Ethernet 4-repeater rule limits the number of repeaters

between any two transceivers to 4. In general, this restricts most vendor con figurations to a ma ximum of 4 concentrators connected in series.

5. Rule number 1 does not include AUI cables of up to 50 meters. Thus, the total network diameter between 10BASE-FL Ethernet nodes can be 3740 meters (4200 m - 560 m + 50 m + 50 m = 3740 m) through a single concentrator.

Figure 2-5 shows an example of an all-10BASE-F L network

Con centrator A

Concentrator B

500 m

T ransceiver

500 m ?

Con cen trator C

1 km

Transceiver

Figure 2-5. All-10BASE-FL Network with 3 Concentrators

Designing and Expanding the Network 2 - 17

Network Distance Calculation Examples

The following examples demonstrate how to calculate network distances for various all-10BASE-FL networks.

Example: A Network with 3 Concentrators

Refer to Figure 2-5, which shows a network with 3 concentrators. T o determine the maximum allowable link distance between Concentrators

A and C:

1. Begin with 4200 meters (Ethernet Rule 3).

2. Subtract the fiber equivalent of the three concentrators with 10BASE-FL Modules that occur on the path between the two transceivers:

3 * 560 meters for each 10BASE-FL module = 1680 meters (Ethernet Rule 4)

3. Subtract the known amount of fiber cable between the two transceivers:

500 m + 500 m + 1 km = 2 km (Ethernet Rule 5)

4. The remainder is the max im um allowable distance of the link between concentrators A and C:

4200 m - 1680 m - 2000 m = 520 meters

5. Verify that the optical power budget is able to drive all of the link distances in the example. Because all link distances are only 1 km or less, and do not have any splices, this is not a problem.

Example: A Network with 6 Concentrators

Six concentrators are connected in Figure 2-6. Use this example to determine if the distances between transceivers are all within the 4200 meter maximum network diameter restriction for Ethernet netw orks.

2 - 18 ONline Ethernet 10BASE-FL Installation and Operation Guide

100m

500m

Conc A Conc B

10BASE-FL Transceivers

Transceivers

500m

100m

500m

Conc CConc D Conc E

Conc F

Transceivers

200m

1km

Transceivers

100m

Note: All 10BASE-FL Transceiver connections to concentrators (each populated with 10BASE-FL Modules) are 100 meters of fiber.

Figure 2-6. Network with 6 Concentrators

In this example, the path between transceivers attaching Concentrators A and F has the greatest fiber equivalent distance of 4440 meters (2200 + (4 * 560) = 4440). Because this distan ce exceeds the maximum of 4200 meters, this configuration is illegal and results in improper network operation.

Designing and Expanding the Network 2 - 19

Because it is not always obvious which path between transceivers has the greatest fiber equivalent distance, use Table 2-6 to help you determine the equivalent distances.

Table 2-6. Fiber Equivalent Distances Between Transceivers

Total F i ber

Distance

Path

A-D 1700 4 2240 3940

A-E 1400 4 2240 3640 A-F 2200 4 2240 4440 D-E 900 3 1680 2580 D-F 1700 3 1680 3380

F-E 1400 3 1680 3080

Betwee n

Transceivers

(meters)

Number o f

Concentrators

(10BASE-FL

Modules)

Between

Transceiv ers

Equi valent

Fiber

Distance of

Concentrator

(meters)

Total Fiber

Equivalent

Distance (meters)

10BASE-FL Backbone, Unshielded Twisted Pair to-the-Desk

Designing a network with unshielded tw isted pair cabling to-th e-desk is similar to an all-10BASE-FL network because the cabling is star-wired in both cases (see Figure 2-7). See the section in this chapter “10BASE-FL Backbone, 10BASE-FL to-the-Desk” for more information on all-10BASE-FL networks.

2 - 20 ONline Ethernet 10BASE-FL Installation and Operation Guide

Be aware of the following tw o additional rules:

❑ Ensure that there are no more than eight 10BASE-FL Modules (and/or

10BASE-T Modules) in the path between any two transceivers due to Ethernet's 4-repeater rule (each 10BASE-FL and 10BASE-T Module counts as a 1/2 repeater). If you have more th an eight modules serially connected, you must add a bridge.

❑ 10BASE-T Modules have an equivalent fiber distance (see Ethernet

Rule 4) as follows: – 420 meters for signals that externally enter a 10BASE-T

Module port

– 165 meters for signals that internally enter a 10BASE-T

Module via the ONline Concentrator backplane

For each pair of 10BASE-T Modules that a signal goes through, there is a fiber equivalent distance of 585 meters (420 m + 165 m =585 m). In addition, if a signal makes a roundtrip through a 10BASE-T Module (that is, enters a 10BASE-T port externally and exits through another port on the same 10BASE-T Module), that counts as 585 meters of fiber equivalent distance.

Example: Sample Configuration Distance Calculation

Use the following example to determine if the 10BASE-T Transceivers in Figure 2-7 are within legal Ethernet limits. Identify the two transceivers that are likely to be the greatest fiber equivalent apart in Figure 2-7. In this case, they are 10BASE-T Transceivers A and B.

Designing and Expanding the Network 2 - 21

10BASE-FL Module

Concentrator A

1000 m

230 m

10BASE-FL Module

Concentrator B

330 m

10BASE-FL Module

500 m

Concentrator C

560 m

- 10BASE-T Module 150 m

10BASE-T Module

Unshielded Twisted Pair

10BASE-T Mo dule

Unshielded T wisted Pair

75 m

Unshielded Twisted Pair

Maximum

1. Diameter

10BASE-FL2. Modules = 1120 m Equivalent Distance

10BASE-T

Modules Equivalent Distance

Distances Between

4. Transceivers

A & B

Remaining Distance

2 m x 560 m

150 m + 1000 m 500 m + 75 m

= 1725 m

Figure 2-7. Sample Configuration Distance Calculation

To make the configuration in Figure 2-7 work, ensure the fiber equivalent distance between transceiver A and transceiver B is less than 4200 meters. To determine if t he network configuration is legal:

1. Use 4200 meters as the maximum network diameter for a pure fiber network as defined by th e 802.3 specifi catio n .

4200 m

585 m

770 m

2. Subtract the equivalent fiber distance for each intervening ONline Concentrator with a 10BASE-FL Module in the path. Figure 2-7 has three concentrators between the two 10BASE-T T ransceivers A and B (Rule 4). The signal transverses three 10BASE-FL Modules from a delay perspective (230 m on Concentrato r A + 560 m on Concentrator C + 330 m on Concentrator B = 1120 m).

3. Subtract the fiber equivalent distance for the two 10BASE-T Modules in Concentrators A and B between the two 10BASE-T T ransceivers A and B (Rule 4).

2 - 22 ONline Ethernet 10BASE-FL Installation and Operation Guide

❑ Incoming signal from Transceiver A to the 10BASE-T Module =

420 m.

❑ Outgoing signal from the 10BASE-T Module to Transceiver B =

165 m (420 m + 165 m = 585 m).

4. Subtract all cable lengths between the two transceivers (calculate copper length the same way you do for fiber). In this example, the total cable distance equals 1725 meters.

If the result from step 4 is greater than zero, the configuration is within legal Ethernet limits (Rule 5).

The calculation in this example shows that 770 m eters remain fo r expansion in this configuration. Therefore, this configuration is legal.

10BASE-FB Fiber Backbone, 10BASE-FL to-the-Desk

Use the information in this section when designing your networ k using 10BASE-FB fiber as the network b ackbone and 10BASE-FL Modules for to-the-desk connectivity. This section assumes that the backbone is comprised of 3C om fiber products, such as the ONline Ethernet Fiber Module or ONline Ethernet 10BASE-FB Module. 3Com Ethe rnet Fiber modules and transceivers conform to the IEEE 10BASE-F standard.

The rules that apply to building this type of network have been covered in the previous sections. The following two additional rules apply when using ONline Ethernet Fiber Modu les:

1. The equivalent fiber distance for the Fiber Module and the Port-Switching Fiber Module is:

– 140 meters for signals that externally enter the module – 50 meters for signals that internally enter the module

through the ON line Concentrator backplane

Designing and Expanding the Network 2 - 23

Therefore, for each pair of ONline Fiber Modules that a signal passes through, there is a fiber equivalent distance of 190 meters (140 m + 50 m = 190 m). In addition, a signal making a round trip through the module (that i s, en tering a port externall y and exiting through another port on the same module) counts as 190 meters of fiber equivalent distance.

2. Do not count the ONline Ethernet Fiber Module and the ONline Ethernet Port-Switching Fiber Module as repeaters when determining the maximum number of repeaters in your network. These are repeater-less devices.

Example: Fiber Backbone, 10BASE-FL to-the-Desk

Use the following example to determine if the 10BASE-FL transceivers ar e within legal Ethernet limits. First identify the two transceivers that are likely to be the greatest distance apart in Figure 2-8. In this case, they are 10BASE-FL transceivers A and B

Concentrator A

Fiber Module

1000 m

Concentrator B

10BASE-FL Module

500 m

Concentrator C

Fiber Module

10BASE-FL Module

450 m

10BASE-FL

75 m

10BASE-FL

50 m

10BASE-FL

Maximum

1. Diameter

FL2.

330 m + 230 m

Modules = 560 m Equivalent Distance

Fiber 50 m+190 m+140 m

3. Modules = 380 m Equivalent Distance

Cable Distance

4. (450 m + 1000 m + 500 m + 75 m)

Remaining Distance

Figure 2-8. Sample Fiber Backbone, 10BASE-FL to-the-Desk

Configuration

2 - 24 ONline Ethernet 10BASE-FL Installation and Operation Guide

4200 m

2025 m

1235 m

To determin e if t he network configuration in Figure 2-8 is leg al :

1. Use 4200 meters as the maximum network diameter as defined by the 802.3 specification.

2. Subtract the equivalent fiber distance for each 10BASE-FL Module in the signal path between T ransceivers A and B. This equals 330 meters for Concentrator A and 230 meters for Concentrator B (560 meters total).

3. Subtract the equivalent fiber distance for each Fiber or Port-Switching Fiber Module in th e signal path. This equals 50 meters for Concentrator A, 190 meters for Concentrator C, and 140 meters for Concentrator B (380 meters total).

4. Subtract all fiber cable lengths between the transceivers (450 m + 1000 m + 500 m + 75 m = 2025 meters).

Because the final remaining distance is greater than zero (1235 meters), the network configuration is legal.

Connecting Extern al Netwo rk Devices

When connecting Thick or Thin Ethernet segments to an ONline network, you can use an:

❑ ONline Ethernet Repeater Module ❑ ONline Ethernet Bridge Module ❑ External repeater or bridge ❑ An IEEE Repeater or ONline Repeater Module each have an

equivalent fiber distance of 800 meters

Designing and Expanding the Network 2 - 25

Example: Connecting a Thin Ethernet (10BASE2 ) Segment

Figure 2-9 shows a typical Thin Ethernet segment connected to an ONline Concentrator th rough an I E EE 802.3 Repeater

10BASE-FL Module

10BASE-FL Backbone

185 m

Coaxial10BASE-FL Transceiver

1500 m

10BASE-T Module

10BASE-FL Module

200 m

Transceiver

5101T-FL

50 m

Transceiver Cable

10BASE-T Transceiver (5101T-TP)

100 m

IEEE

Repeater

Thin Ethernet

Figure 2-9. Thin Ethernet Segment Connecting to ONline Using an IEEE Repeater

To determine if the configuration in Figure 2-9 meets Ethernet distance limitations for transceivers A and B:

1. Use 4200 meters as the maximum network diameter as defined by the 802.3 specification.

2. Subtract the fiber equivalent distance of 420 m for the signal externally entering the 10BASE-T Module from T ransceiver B and 230 meters for the signal exiting the 10BASE-FL Module within the same concentrator. (Ethernet Rule 4)

3. Subtract the fiber equivalent distance of 560 meters for the signal externally entering the 10BASE-FL Module in the top concentrator, and internally exiting a different port on the same 10BASE-FL Module.

4. Subtract the fiber equivalent distance (800 m) of the IEEE Repeater. (Ethernet Rule 4)

2 - 26 ONline Ethernet 10BASE-FL Installation and Operation Guide

Note: In the reverse direction, a signal originating at Transceiver

A loses 165 m of fiber equivalent distance when it exits the 10BASE-T Module to which T ransceiver B is connected and 330 meters for the signal entering the 10BASE-FL Module in the bottom concentrator. The overall fiber equivalence of the path is greater for signals going from T ransceiver B to A, however, the B to A f iber equivalence determines whether the link meets the 4200 m Ethernet link maximum.

5. Subtract the sum of intervening cable lengths: 185 m + 50 m + 200 m + 1500 m + 100 m = 2035 m

6. The remainder is: 4200 m - 420 m - 230 m - 560 m - 800 m - 2035 m = 155 m Because the remaining value is greater than zero, the configuration in

Figure 2-9 is legal.

Designing and Expanding the Network 2 - 27

Fault-Tolerant Configurations

This section contains descriptions of the redundancy features built into the ONline 10BASE-FL Module. Y ou can implement link redundancy between concentrators using the port redundancy switch settings on the 10BASE-FL Module.

This section contains the following topics:

❑ Configurin g Ports for Fault Tolerance ❑ Implemen ting Backbone Cable Plant Fault Tolerance ❑ Implemen ting Total Backbone Fault Tolerance

Configuring Ports for Fault Tolerance

You can configure ports 1 through 4 on the 10BASE-FL Module in one of five ways:

❑ Normal Configuration - Ports 1 through 4 operate as independent

cable ports.

❑ Standard Redundant Configuration - In this configuration:

– Port 1 acts as the primary port and port 2 as the backup

for 1.

– Port 3 acts as the primary port and port 4 as the backup

for 3.

❑ Flexible Redundant Configuration - You can arbitrarily assign

primary and backup ports to any pair of ports. Y ou can configure this mode only through a network management module.

❑ Normal and Redundant Configuration - You can enable

redundancy between one set of ports and configure the remaining two ports to operate as independent ports.

2 - 28 ONline Ethernet 10BASE-FL Installation and Operation Guide

❑ Remote Failure Signaling Configuration - If redundancy is enabled

at the other end of the fiber link, you must enable remote failure signaling for all connecting 10BASE-FL Module ports.

Implementing Backbone Cable Plant Fault Tolerance

Y ou can enable redundancy between two ports on the 10BASE-FL Module using either:

❑ Network management module commands ❑ A dip switch

This section describes:

❑ Setting Redundancy ❑ Remote Failure Signalling

Setting Red undancy

When you enable redundancy betw een two ports, the ports are automatically enabled. Port 1 (or 3) then becomes the primary link and port 2 (or 4) the redundant link. Fo r m aximum cable plant fault tolerance, connect both the primary and backup ports back to the central concentrator (Figure 2-10). This configuration allows the backup port to automatically take over if the primary link fails.

Designing and Expanding the Network 2 - 29

Redundancy

Primary

10BASE-FL

Link

Enabled

Redundancy Enabled

Primary B ackup

Ba ckup

10BASE-FL

Link

Redundancy Disabled (Remote Failure Signaling enabled for port 4 on each 10BASE-FL Module)

Figure 2-10. Redundant Fiber Backbone Configuration

Note: Always enable redundancy in the lower level concentrators

(those connectin g to the central concen trators in the star-wired topology).

The primary port passes data. The backup port does not pass any data in either direction, but the link is monitored for any failures (the Port Status LED indicates any problems).

2 - 30 ONline Ethernet 10BASE-FL Installation and Operation Guide

Remote Failure Signaling

In any redundant link path, you can designate (that is, activate) only one end as a redundant port pair (1-2 or 3-4). Y ou must enable remote failure signaling (RFS) if ports are connected to fiber with redundancy enabled at the other end. If you enable ports at both ends as redundant, or if you do not enable remote failure signaling at the distant end, improper operation of the redundant switchover mechanism occurs (see Figure 2-11).

If the primary link experiences a local or remote fault, the backup link activates and the primary ports disconnect (that is, they do not pass data to and from the con centrator). Once the switchover to backup occ urs, the redundancy status indicators blink at the redundant module end. However , primary port diagnostics continue to operate. If the fault clears, the primary port is re-enabled.

Each redundancy status LED (located beneath the Activity LEDs):

❑ Is off - If you disable redundancy. ❑ Is on - If you enable redundancy and both ports are operational. ❑ Blinks - If a switchover occu rs due to a link failure.

Designing and Expanding the Network 2 - 31

Implementing Total Backbone Fault Tolerance

You can add a backup ONline System Concentrator to provide total backbone fault tolerance and link redundancy for your backbone network. As shown in Figure 2-11, if the primary concentrator or any primary links fail, the backup concentrator takes over. In this configuration:

❑ One port on the 10BASE-FL Modules connects to the primary

concentrator.

❑ The other port connects to the backup concentrator.

You must also hav e a direct connection between th e two concentrator s

Redundancy Enabled

Primary Fiber Link

Backup Fiber Link

Redundancy Enabled

Redu ndancy Disabled (Rem ote F ailure Signaling enabled for port 4 on ea ch 10BASE-FL Module)

Figure 2-11. Total Backbone Fau lt-Tolerant Configuration

2 - 32 ONline Ethernet 10BASE-FL Installation and Operation Guide

Example: Network with Three Concentrators and a Fourth Concentrator in Full Redundancy Configuration

In the following example, three concentrators are active.

Concen trator A

500 m

1 km

500 m

10BASE-FL Transceiv er s

500 m

1 km

Concen trator DConcen trator C

Transceivers

Concentrator B

500 m

10BASE-FL

500 m

Fiber cable

Primary Link Backup Link Normal Link

Figure 2-12. Network With 3 Concentrators

Concentrator B is a redundant concentrator for Concentrator A. The fiber equivalent distance between transceivers attached to Concentrators C and D is:

3 * 560 m + 500 m + 1000 m + 500 m + 500 m = 4180 meters

Because the sum is less than 4200 meters, the configuration is legal.

Designing and Expanding the Network 2 - 33

In Figure 2-12, if the main li nk from Concentrator A to Concentrator C faults, the signal path enabled through redundancy includes Concentrator B. By adding Concentrator B, the fiber equivalent d istance becomes too great and the network cannot work b ecause the path between Concentrators C and D is C-B-A-D:

4 * 560 + 500 m + 1000 m + 500 m + 500 m + 500 m = 5240 meters

Because the sum i s greater than 4200 meters, this configuration is not legal. When designing a redundant network, be sure to consider the backup route distance.

2 - 34 ONline Ethernet 10BASE-FL Installation and Operation Guide

Installing and Operating the Module

This chapter describes the installation procedures for the ONline Ethernet 10BASE-FL Module.

For your convenience, a quick reference installation chart is included. This chapter includes the following sections:

❑ Precautionary Procedures ❑ Unpacking Procedures ❑ Quick Installation ❑ Setting the Dip Switches ❑ Installing the Module ❑ Config uring the Module ❑ Showing Module Configuration ❑ Monitoring the Front Panel ❑ Verifying the LEDs and Network Assignments

Note: Read the precautionary procedures before unpacking the

module.

Installing and Operating the Module 3 - 1

Precautionary Procedures

Electrostatic discharge (ESD) can damage static-sensitive devices on circuit boards. Follow these precautions when you handle the 10BASE-FL Module:

❑ Do not remove the board from its anti-static shielding bag until you

are ready to inspect it.

❑ Handle the board by the faceplate only. ❑ Use proper grounding techniques when you install the 10 BASE-FL

Module. These techniques include: – Using a foot strap and grounded mat or wearing a

grounded static discharge wrist strap.

– Touching the grounded rack or other source of ground

just before you handle the 10BA SE-FL Module.

Unpacking Procedures

When unpacking your 10BASE-FL Module:

1. Verify that the 10BASE-FL Module is the correct model by matching the model number listed on the side of the shippin g carton to the model numb er y ou ordered (Model Number 5104M-FL1).

Note that the product model number printed on the shipping box differs from the model number on the product. The model number on the shipping box contains the prefix ’3C9’.

2. Remove the 10BASE-FL Module from the shipping carton.

3. Remove the 10BASE-FL Module from the anti-static shielding bag and inspect the mod ule for damage. If the modu l e appears to be damaged, replace it in the anti-static shielding bag, return it to the shipping c arton, and contac t your local supplier.

3 - 2 ONline Ethernet 10BASE-FL Inst allation and Operation Guide

4. Keep the carton and anti-static bag in which your module was shipped for repackagi ng the module for st orage or shipment.

5. Record the serial number of your 10BASE-FL Module. A log and other information specific to your modules is included in the ONline System Concentrator Installation and Operation Guide, Appendi x B , Slot Usage Chart.

Quick Install atio n

Table 3-1 outlines the steps for installing your module.

Table 3-1. Quick Installation Proce dures

Step Procedure Section Title

1. Verify that your network complies with basic rules for network design.

2. Unpack the module. Unpacking

3. If you do not have a management module installed in t he concentrator, configure the dip switch settings to your specifications.

4. Insert the module into a blank slot in the concentrator and tighten the faceplate screws.

5. Establish connections from the 10BASE-FL Module to another 10BASE-FL Module or 10BASE-FL T ransceiver using the appropriate connectors and cabling.

Chapter 2, Designing and Expanding the Network

Procedures Setting the Dip

Switches

Installing the Module

Installing and Operating the Module 3 - 3

Table 3-1. Quick Installation Procedures (Continued)

Step Procedure Section Title

6. If you have a management mod ule installed in the concentrator, configure the module using the managemen t commands.

7. Verify LED status for normal operation. Verifying LED and

Setting the Dip Switches

The 10BASE-FL M odule has two 8-position dip switches (SW1 an d SW2) located on the rear of the board. Figure 3-1 shows the location and default settings of the SW1 and SW2 dip switches. You may need to reconfigure one or more of these switches depen ding on your configuration requirements.

The dip switch settin gs for the 10BASE-FL Module are ignored if an appropriate ONline management module is installed in the concen trator. For this reason, use the management commands (rather than the dip switches) to configure the 10BASE-FL M odule. If you have an installed Ethernet Management Module (EMM) at Version 4.01 or higher , install the module first and then refer to the Configuring the Module section in this chapter for m o re information.

Configuring the Module

Network Assignments

The remainder of this section describes:

❑ Setting Dip Switch SW1 ❑ Setting Dip Switch SW2

3 - 4 ONline Ethernet 10BASE-FL Inst allation and Operation Guide

AAAA

Port 1 Port 2 Port3 Port4

Redun 1-2 Redun 3-4

Port 1

Port 2

Port 3

Port 4

AAA

PRTEN4

PRTEN3

PRTEN2

PRTEN1

SPARE

RED34

RED12

RFS4

RFS3

RFS2

RFS1

1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8

Channel Selection Switches

CH A B

1 On On 2 On Off 3 Off On Isolate d Off Off

Backplane DIN Connector

Figure 3-1. 10BASE-FL Module Dip Switch Locations

SPARE

CHB

CHA

SW2SW1

Setting Dip Switch SW1

The SW1 dip switch on the 10BASE-FL Modul e co ntains 8 dip switches. Switches 7 and 8 are not functional. The remaining switches allow you to:

❑ Enable or disable redundancy between ports 1 and 2 or 3 and 4 ❑ Enable remote failure signaling for each port

Installing and Operating the Module 3 - 5

T able 3-2 lists the functions and settings for switch SW1. For a definition of each dip switch function, refer to the Con figuring the Module section.

Table 3-2. Dip Switch SW 1 Settings

Switch Label Function

1 RFS1 Enable remote

failure signaling on port 1

2 RFS2 Enable remote

failure signaling on port 2

3 RFS3 Enable remote

failure signaling on port 3

4 RFS4 Enable remote

failure signaling on port 4

5 RED12 Enable/disable

redundancy between ports 1 and 2

Factory

Default

disable disable

Switch Set ting

Off On

6 RED34 Enable/disable

redundancy between ports 3 and 4

7 and 8 SPARE Not used

3 - 6 ONline Ethernet 10BASE-FL Inst allation and Operation Guide

disable disable

Setting Dip Switch SW2

The SW2 dip switch on the 10BASE-FL Modul e co ntains 8 dip switches. Switches 7 and 8 are not functional. The remaining switches allow you to:

❑ Enable or disable e ach of t he ports ❑ Assign the m odule to a channel

Table 3-3 lists the functions and settings for switches 1 through 4. For a definition of each dip switch function, refer to the Configuring the Module section in this chapter..

Table 3-3. Dip Switch SW 2 Settings for Switches 1 to 4

Switch Function Factory D efault

1 Enable/Disable port 1 Enable (On) 2 Enable/Disable port 2 Enable (On) 3 Enable/Disable port 3 Enable (On) 4 Enable/Disable port 4 Enable (On)

Installing and Operating the Module 3 - 7

Table 3-4 lists the functions and settings for switches 5 and 6. For a definition of each dip switch function, refer to the Configuring the Module section in this chapter.

Table 3-4. Dip Switch SW 2 Settings for Switches 5 and 6

CHA CHB Channel Selection

Switch Settings

Installing the Module

Y ou do not need to power down the ONline System Concentrator to install the 10BASE-FL Module. You can insert the module while the concentrator is operating (this is called a hot swap).

To install the module:

1. Do one of the following:

❑ If you do not have a management module installed in the

concentrator, set the dip switches on the board (if different from the default settings). After you complete the installation procedure, proceed to the Monitoring the Front Panel section to verify the installation.

On On 1 (factory default)

On Off 2 Off On 3 Off Off Isolated (module operates

independent of any backplane channel)

❑ If you have a management module installed in the concentrator,

complete this installation procedure and then configure the module using the commands as described in the Configuring the Module section.

3 - 8 ONline Ethernet 10BASE-FL Inst allation and Operation Guide

2. Locate a blank slot in the concentrator. If there is no blank slot, remove a blank panel on the concen trator to expose a slot for the 10BASE-FL Module.

3. Insert the module into the board guides at the top and bottom of the slot and slide it into the concentrator . Make sure that the connector is well seated into the backplane of the concentrator.

Figure 3-2 shows the installation of the 10BA SE-FL Module

Figure 3-2. Installing the 10BASE-FL Module

4. Fasten the spring-loaded screws on the front of the 10BASE-F L Module faceplate to th e concentrator using your fingers (do not overtighten).

5. Remove the plastic fiber optic dust covers from the cable ports. Keep unused cable ports capped to keep the optics clean.

6. Attach the fiber cables to the fiber ports on th e front of the 10BASE-FL Module as shown in Figure 3-3.

Installing and Operating the Module 3 - 9

Figure 3-3. 10BASE-FL Module Connection

7. Make sure that the transmit and receive cables are:

❑ Clearly marked or color coded. ❑ Connected to the appropriate ports on the 10BASE-FL Module. ❑ Properly cleaned with an appropriate fiber optic cleaning solution

before installation.

Note: Do not exceed the b end radius for the fiber cable when

directing the cables under the conc entrator. Refer to the cable manufacturer's specifications for minimum bend radius.

8. Attach the other ends of the cables to either:

❑ Another ONline 10BASE-FL Module. ❑ An ONline 10BASE-FL Transceiver.

3 - 10 ONline Ethernet 10BASE-FL Installation and Operation Guide

Make sure that the transmit fiber at one end always connects to a receive port at the other end.

Caution: Do not connect the 10BASE-FL Mo dule to an ONline

Ethernet Fiber Module, to a 10BASE-FB module, or to any other module or transceiver that is not FOIRL-compatible or 10BASE-FL-compliant. These illegal connections may cause network failure.

Configuring the Module

The ONline management modules can configure the following settings on the 10BASE-FL Module:

❑ Enable/disable any port on the module ❑ Set the module to a network ❑ Enable redundancy betw een two ports ❑ Enable remote failure signaling for any port

The following ONline management modules provide network management capabilities for the O Nline System Conc entrator and its modules:

❑ Ethernet Management Module V3.20 ❑ Token Ring Management Module V3.00 ❑ FDDI Management Module V1.01

When an ONline management module is installed in a concentrator , all of the dip switch settings on the 10BASE-FL Module are overrid den.

Installing and Op erating the Module 3 - 11

When you first install the module:

1. The network (channel) defaults to isolated mode . The ports are automatically disabled so that unapproved users cannot be added. Therefore, you must enable the p orts you wish to use and set the module to the appropriate Ethernet netw ork through the management commands.

2. All other module settings retain the same default values as the dip switch default values. Therefore, you only change these values through manag ement if you do not want the default values.

This section describes the management comm ands to set these features. For additional information on the available network management features, refer to:

❑ The appropriate ONline Management Module Installation and

Operation Guide

❑ ONline Manag em ent C om mands Guide

Enab ling Port s

You can enable or disable each of the four ports on the module. When a port is enabled, it can transmit data onto and receive data from the network to which the m od ule is assigned .

To enable or disable a specific port, use the following management command:

SET PORT {

slot.p or t

{

slot.

} MODE {enable}

all} {disable}

3 - 12 ONline Ethernet 10BASE-FL Installation and Operation Guide

Selecting a Network

The ONline 10BASE-FL Module is equipped with the technology to work with the ONline Concentrator's unique TriChannel™ Architecture. This feature lets you assign the module to any of three networks (or none) on the ONline System Concentrator backplane. Refer to the ONline System Concentrator Installation and Operation Guide, Chapter 1, for a discussion of the ONline TriChannel Architecture.

To set the module to a network or set it to isolated mode, use the following management command:

SET MODULE {

slot

} NETWORK {ethern et_ 1}

Note: The dip switch settings on the m od ule refer to the

backplane connection as the “channel” connection. The channel setting and the network setting are the same. Modules set to the same network communicate with each other .

Enab ling Port Redund ancy

{ethern et_ 2} {ethern et_ 3} {isolat ed}

You can enable por t redundancy in one of the following ways:

❑ If you have network management, you can enable or disable main

port redundancy between any two ports on the 10BASE-FL Module.

❑ If you do not have management, you can use the dip switches on the

module to configure redundancy between ports 1 and 2 on the module and/or por t s 3 and 4.

Installing and Op erating the Module 3 - 13

For example, when you enable redundancy:

1. Port 1 becomes the primary link and port 2 is the redundant link.

2. If the primary link (port 1) fails, the redundant link (port 2) is engaged automatically, thus preventing a network failure.

3. When you disable redundancy, each port works independently.

Note: Enabling port redundancy for two ports automatically

enables the ports themselves, even if the ports were previously disabled.

The redundancy status LEDs, located between the sets of port LEDs and the port connec tors on the 10BASE-FL Module, are:

❑ Off - When you disable redundancy (default setting). ❑ On - When you enable redundancy.

For information about the redundancy LEDs, refer to Table 3-5. To set redundancy between ports, use the following management

command:

SET PORT {

slot.port

} MODE REDUNDANT {

slot.port

}

To turn off redundancy between ports, use the MODE NON_REDUNDANT option. Redundancy configurations are shown in Chapter 2, Designing and Expanding the Network.

Note: If you enable redundancy on one end of a link, you must

enable Remote Failure Signaling (RFS) at the other end. For more information, refer to the next section, Enabling Remote Failure Signaling.

3 - 14 ONline Ethernet 10BASE-FL Installation and Operation Guide

Enabling Remote Failu re Signal ing

Due to the nature of the 10BASE-FL standard, the receive path of a redundant port can detect no light and partition errors, but the transmit path cannot detect these errors. Remote Failure Signaling (RFS) provides a way for transmit failures to be detected so that a switchover from a primary to a backup port can occur. Y ou can enable RFS for any of the four ports on your module. When you connect two 10BASE-FL Modules and enable redundancy between two ports on one of the modules, you must enable RFS on the corresponding ports of the other module.

For example, if you enable redundancy between p orts 1 and 2 on 10BASE-FL Module #1 and these ports are connected to ports 1 a nd 2 on Module #2, you must enable RFS on ports 1 and 2 on 10BASE-FL Module #2 (Figure 3-4). Note that RFS is automatically disabled when you disable redundancy on the corresponding port or disable the port.

Figure 3-4. 10BASE-FL Modules Connected with Redundancy/RFS

Enabled

Installing and Op erating the Module 3 - 15

To enable RFS for a port, issue the following management command:

SET PORT {

slot.port

} MODE REMOTE_FAILURE_SIGNALING

Saving Modu le Co nfig uratio n

To save the module and port settings to management module memory, issue the following command:

SAVE MODULE_PORT

Showing Mo du le Configu ratio n

Y ou can display status information about the 10BASE-FL Module using the following commands:

❑ SHOW MODULE ❑ SHOW MODULE VERBOSE ❑ SHOW PORT ❑ SHOW PORT VERBOSE

For example, the following command displays detailed information about port 1 on an 10BASE-FL Module in slot 6 of the concentrator.

ONline> show port 6.1 verbose [ENTER] Port Display for Module 5104M-FL Port Mode Status Network General In fo rma ti on

06.01 ENABLED OKAY ISOLATED

Port Connect or FIBER Mode Di p S et tin g: ENABLED

3 - 16 ONline Ethernet 10BASE-FL Installation and Operation Guide

This display tells you the status of the specific port. It includes the management module and dip switch settings from the board. For m ore inform ation on the SHOW commands, refer to the:

❑ Appropriate ONline Management Module Installation and Operation

Guide

❑ ONline Management Commands Guide

Monitorin g the Front Panel

The LEDs on the front panel of the 10BASE-FL Module allow you to monitor the status of each port. The 10BASE-FL Module has 10 LEDs on the front panel that allow you to monitor diagnostic, activity , and redundancy status for each port.

Figure 3-5 shows the location of these indicato r s

Installing and Op erating the Module 3 - 17

Figure 3-5. 10BASE-FL Module Faceplate and ONline System Concentrator

3 - 18 ONline Ethernet 10BASE-FL Installation and Operation Guide

Table 3-5 describes how to interp ret the 10BASE-FL Module LEDs.

Table 3-5. Interpretin g the 10BASE-FL Module LEDs

LED Name Color State Indicates

Activity Yellow Off No packets are received on

the fiber segment.

(Ports 1-4) On Constant activity on the fiber

segme nt.

Blinking Module receives packets

from segment to which it is

attached. Status Green Off Port disabled. (Ports 1-4) On Port enabled or in standby

and link integrity is OK.

1 blink No light detected. 2 blinks Port partitioned.

Redundancy (Ports 1&2) (Ports 3&4)

3 blinks FIFO error or MAU jabber

lockup protection.

Green Off Redundancy is disabled;

ports are independent of

each other.

On Redundancy is enabled

between ports 1 and 2

and/or 3 and 4.

Blinking Redundanc y is enabled

between ports 1 and 2

and/or 3 and 4 and there is

a failure on one of these

ports.

Installing and Op erating the Module 3 - 19

Verifying the LED and Network Assignments

Once you install the module, verify its operation through the front panel of the ONline Controller Module. The Controller Module is equipped with an LED check button on the front panel. Use the LED check button to:

❑ Verify LED operation ❑ V erify network (channel) assignment

When you press this button, the Controller Module initiates a test to all modules in the con centrator. All LEDs should respond by lighting continuously for approximately five seconds. Any LED that does not light is defective.

After the 5 seconds elapse, the diagnostic continues with a network (channel) check of all modules. Each Status LED should respond by blinking the number of times to correspond with the network to which the module is assigned. The network check sequence repeats five times. Table 3-6 explains the network check codes.

Table 3-6. Network Check Codes

LED State Module Is Configu red fo r...

1 Blink Network 1 2 Blinks Network 2 3 Blinks Network 3 Off Isolated mode (operates independent of any network)

3 - 20 ONline Ethernet 10BASE-FL Installation and Operation Guide

Troubleshooting

This chapter describes fault conditions and troubleshooting suggestions for the 10BASE-FL Module.

This chapter contains the following sections:

❑ Troubleshooting Using the Port Activity LEDs ❑ Troubleshooting Using the Port Status LEDs ❑ RFS Troubleshootin g ❑ Technical Assistance

Note: Do not connect a 10BASE-FL Module to an ONline Ethernet

Fiber Module, fiber transceiver , or any other non-10BASE-FL compliant or FOIRL- compatible product. ONline fiber products use 10BASE-FB signaling, which are incompatible with the 10BASE-FL protocol and FO IRL.

Troubleshooting 4 - 1

Troubleshooting Usin g the Port Acti vity LEDs

If a port Activity LED does not light, use the Table 4-1 to help troubleshoot the problem.

Table 4-1. Troubleshooting Using the Port Activity LEDs

LED Name

Activity (Ports)

1 - 4)

LED

State

Off There is no traffic

Possible Cause Corrective Action

received from the segment.

Port is disabled. Enable the port. Power is off. Check the Controller

Activity LED has burnt out.

10BASE-FL Module port is faulty.

10BASE-FL Module is faulty.

Backplane connection is bad.

None.

Module Power LED. Press the LED check

button on the Controller Module.

Connect the cabl e to a different port.

Try a different 10BASE-FL Module.

Reinsert the 10BASE-FL Module. If this fails, try another concentrator slot.

4 - 2 ONline Ethernet 10BASE-FL Inst allation and Operation Guide

Troubleshooting Using the Port Status LEDs

A blinking Port Status ind icator is always a sign that the port detects a potential problem. Once a port detects a problem, you can further analyze the problem by counting the number of blinks. Table 4-2 provides troubleshooting suggestions for each blinking sequence.

Table 4-2. Troubleshooting Using the Port Status LEDs

LED State Indication Possible Cause Corrective Action

Off Port

Disabled

1 Blink No Light

Received

Port disabled. Enable port. 10BASE-FL

Module not powered.

Broken LED. Press LED check

Bad 10BASE-FL Module.

Cables crossed. Verify TX on remote

Broken fiber cable.

Bad fiber connections.

Check concentrator power status.

Reinsert 10BASE-FL Module.

button on Controller Module.

Replace Module.

device is connected to RX on 10BASE-FL Module.

Check and fix RX fiber link.

Clean and reconnect fiber (both ends).

Troubleshooting 4 - 3

Table 4-2. Troubleshooting Using the Port Status LEDs

LED State Indication Possible Cause Corrective Action

1 Blink (continued)

2 Blinks Port

No Light Received

Partitioned

Insufficient opti cal power received.

Bad remote device.

Bad 10BASE-FL Module.

Bad fiber connections.

Bad remote device.

Broken fiber . Check and fix RX fiber

Check 10BASE-FL Module optical power using a light meter .

Check optical po wer of remot e de v i ce.

If optical power levels are OK, che ck cable; it may be bad or too long.

Replace remote device.

Replace module.

Clean and reconnect fiber (both ends).

Replace remote device.

link.

Bad 10BASE-FL Module.

3 Blinks FIFO error or

MAU jabber lockup protection

4 - 4 ONline Ethernet 10BASE-FL Inst allation and Operation Guide

Check optical power.

Bad fiber connections.

Broken or cracked fiber.

Replace Module.

Verify that optical power level is correct.

Clean and reconnect TX fiber (both ends).

Check and fix RX fiber link.

Table 4-2. Troubleshooting Using the Port Status LEDs

LED State Indication Possible Cause Corrective Action

3 Blinks (continued)

FIFO error or MAU jabber lockup protection

RFS Troubleshooting

When you enable redundancy for a port on one 10BASE-FL Module (splices), you must enable Remote Failure Signaling (RFS) on the corresponding port of the remote 10BASE-FL Module to which it is connected. If you accidentally enable RFS on both sides of a 10BASE-FL link, the link may fail because each side “thinks” it is the remote end of the link.

In addition, when you enable redundancy on both sides of a 10BASE-FL link and the primary port fails, the backup port on the remote end of the link does not take over because the port “thinks” it is the primary port.

Bad unit or non-10BASE-FL equipment at other end.

Bad 10BASE-FL Module.

Try another port or replace other unit.

Replace module.

Technical Assistance

Y ou can receive assistance for installing and troubleshooting the 10BASE-FL Module by calling either your 3Com reseller or 3Com T echnical Support. Be prepared to supply a representative with the following informatio n:

❑ Description of the problem ❑ Steps you have tak en to try and correct the problem ❑ T ype and software version of the ONline management module being

used

Troubleshooting 4 - 5

❑ Version of software installed on your 10BASE-FL Module ❑ Status of the front panel LEDs ❑ Configuration of your concentrator

(you may find it helpful to refer to the Slot Usage Chart in Appendix B of the ONline System Concentrator Installation and Operation Guide for a record of this information)

Refer to Appendix B for instruction s on contactin g Technical Support for your product .

4 - 6 ONline Ethernet 10BASE-FL Inst allation and Operation Guide

Specifications

This appendix lists specifications for the 10BASE-FL Module, including:

❑ General Specifications ❑ Optical Specifications ❑ Power Requirements ❑ Environmental Speci fications ❑ Mechanical Spec ifications ❑ 10BASE-FL Cable and Connec tor Specifications

Specifications A - 1

General Specific atio ns

Table A-1 lists general specifications for the 10BASE-FL Module.

Table A-1. General Specifications

10BASE-FL Module Model number

Collision Detection 100% determi nistic Configuration Rules Compliant with IEEE 802.3 10BASE-FL

Maximum Number of Nodes 1024 Backplane Interface 96-pin edge connector, compatible

External Connec tor 4 pairs of fiber ports (ST, SMA, or FC

Host Interfac e ONline System Co ncentrator bus

Installation Att ac hment Two t humbscrews on the mou nting

5104M-FL1

and FOIRL specifications

with the 3Com ONline System Concentrator

connectors)

interface standard

bracket

A - 2 ONline Ether net 10BASE-FL Installation and Operation Guide

Optical Specifications

This section lists the optical specifications for the 10BASE-FL Module, including:

❑ Transmitter Specifications ❑ Receiver Specifications ❑ Supported Fiber Optic Cables ❑ Fiber Optic Interface

Transmitter Specifications

Light Source: GaA1As LED at wavelength 820 ± 20 nm. Power coupled into fiber cable inclusive of ST, SMA, or FC connector loss.

Table A-2 lists transmit power specifications.

Table A-2. Transmit Power (Peak Values)

- 6.5 dBm (± 3.0 dBm ) 100/140 m icron, 0.29 NA fiber

- 9.0 dBm (± 3.0 dBm) 85/125 micron, 0.29 NA fiber

- 12.0 dBm (± 3.0 dBm) 62.5/125 micron, 0.275 NA fiber

- 16.5 dBm (± 3.0 dBm) 50/125 micron, 0.20 N A fiber

Specifications A - 3

Receiver Specifications

Table A-3 lists receiver specifications for t he 10BASE-FL Module.

Table A-3. Receiver Specifications

Light Detector Silicon PIN photodiode Input Range Optical power input of -8.0 dBm to

Bit Error Rate 1 in 10 Dynamic R ange 21.5 dB

Supported Fiber Optic Cables

You can use the following fib er optic cables with the 10BASE-FL Mod ule:

❑ 50/125 ❑ 62.5/125

-29.5 dBm (peak values)

-9

over dynamic range

❑ 85/125 ❑ 100/140

The fiber optic cable must be:

❑ Micron diameter graded index ❑ Duplex fiber ❑ 150 MHz km rating or better

A - 4 ONline Ether net 10BASE-FL Installation and Operation Guide

Fiber Optic Interface

Table A-4 lists specifications for the fiber optic interface.

Table A-4. Fiber Optic Interface Sp ecifications

Data Rate 10 Mbps (million bits per second) Data Modulation Manchester Fiber Optic Interface ST-, SMA-, an d FC-type

Power Requirements

Table A-5 lists power requirements for the 10BASE-FL Module.

Table A-5. Power Requirements

Power Requirements 2.0 Amp @ 5 V Fuse 4.0 Amps for 5 V, Fast blow Power Consumption 10 watts BTU/hour 34.13

Specifications A - 5

Environmental Speci fic atio n s

Table A-6 lists electrical specificati ons for the 10BASE-FL Module.

Table A-6. Electrical Specifications

Operating Temperatu re 0° to 50° C (32 ° to 122° F) Storage Temperature -30° to 65° C (-22° to 149° F) Humidity Less than 95%, non-c ondensing

Mechanic al Sp eci fic atio ns

Table A-7 lists mechanical specifications for the 10BASE-FL Module.

Table A-7. Mechanical Specifications

Dimensions 1.0" W x 10.25" L x 8.5" H

(2.54 cm x 26.04 cm x 21.6 cm)

Weight 1.25 lb. (0.57 kg.)

A - 6 ONline Ether net 10BASE-FL Installation and Operation Guide

10BASE-FL Cable and Connector Specifications

This section contains information on 10BASE-FL and fiber products, cables, and connectors. Use the information in the following sections to ensure that the cables and connecting hardware meet requirements.

In addition to the ONline Ethernet 10BASE-FL Module, 3Com offers the ONline 10BASE- FL Transceiver (Model Number 5101T-FL1-ST, 5101T-FL1-SMA, or 5101T-FL1-FC). The 10BASE-FL Transceiver connects the ONline 10BASE-FL Module to the fiber or 10BASE-FL network.

Fiber Cables and Connectors

You can use several type s of fiber cables and connectors to link your 10BASE-FL Module to your network. These cables and connectors are explained in the sections that follow. For proper operation, use only approved cables when you in stall all equi pm ent.

Fiber Cables

The fiber optic cable diameters that the 10BASE-FL Module supports must meet the followin g qualifications:

❑ 50/125, 62.5/1 25, 85/125, or 100/1 40 µm graded index fiber ❑ Duplex fiber with a 150 MHzKm rating or better

Note that network link distances are affected by the grade of cable you choose. The quality of fiber cable varies significantly . Typically , measure quality in terms of the signal loss per kilometer . The less amount of loss the cable has, the better the cable quali ty is. Good quality 62.5 µm fib er typically has a 3 to 4 dB loss per kilometer.

Specifications A - 7

Fiber Connect ors

The 10BASE-FL Module is available in ST-, SMA-, and FC-type fiber connectors for direct connection to a Fiber Ethernet LAN. When you order the 10BASE-FL Modul e, use the part number listed in Table A-8 for the correct connector type.

Table A-8. Connector Ty pe Part Number

Connector Type Part Number

ST 510 4M-FL 1-ST

SMA 5104M-FL 1-SMA

FC 5104M-FL1-FC

Connecting Fiber Cables

If you use a concentrator in your network setup, connect cables first at the active concentrator location. Refer to the ONline System Concentrator Installation and Operation Guide for more information about the concentrator connections and configuration rules.

A - 8 ONline Ether net 10BASE-FL Installation and Operation Guide

Technical Support

3Com provides easy access to technical support information through a variety of services. This appendix describes the following services:

❑ On-line Technical Support ❑ Support from Your Network Supplier ❑ Support from 3Com ❑ Returning Products for Repair ❑ Accessing the 3Com MIB ❑ 3Com Technical Public ation s

On-line Technical Supp ort

3Com offers world wide product suppo rt through the following on-line systems:

❑ Email Technical Support ❑ World Wide Web Site

Technical Support B - 1

Email Technical Support

Y ou can contact the Integrated Systems Division (formerly Chipcom) on the Internet fo r technical support using the e-mail address techsupp@chipcom.com.

World Wide Web Site

You can access the latest netwo rking information on the 3Com World Wide Web site by entering our URL into your Int ernet browser:

http://www.3Com.com/

This service features news and information about 3Com products, customer service and support, the 3Com latest news releases, selected articles from 3TECH™, the 3Com award-winning technical journ al, and more.

You can contact the Integrated Systems Division on the World Wide Web by entering our URL into your Internet browser:

http://www.chipcom.com/

There are links between both WWW pages to view information from all 3Com divisio n s.

Support from Your Network Supplie r

If additional assistance is required, contact your network supplier. Many 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.

B - 2 Online Ethernet 10BASE-FL Inst allation and Operation Guide

When you contact your network supplier for assistance, have the following information ready:

❑ Diagnostic error messages ❑ A list of system hardware and sof tware, inclu ding revision levels ❑ Details about recent configuration changes, if applicable

If you are unable to contact your network supp lier, see the following section on h ow to contact 3Com.

Support from 3Com

If you are unable to receive support from your network supplier , technical support contracts are available from 3Com.

For direct access to customer service for Integrated Systems Division products in:

❑ U.S.A. and Canada - call (800) 724-2447 ❑ Asia Pacific - call (508) 787-5151 ❑ Europe – refer to the table below. For European countries not listed,

call 31 30 60 299 00.

Country Telephone Number Country T elephone Number Belgium 0800 71429 Netherlands 06 0227788 Denmark 800 17309 Norway 800 11376 Finland 0800 113153 Spain 900 983125 Franc e 05 917959 Sweden 020 795482 Germany 0130 821502 U.K. 0800 966197 Ireland 1 800 553117 U.S. 800 876-3266 Italy 1678 79489

Technical Support B - 3

For access to customer service for all 3Com products, call (800) 876-3266. You can also contact the Integrated Systems Division (ISD) on the Internet

by using the e-mail address techsupp@chipcom.com.

Return i ng P roducts fo r Repa ir

A product sent directly to 3Com for repair must first be assigned a Return Materials Authorization (RMA) number . A product sent to 3Com without an RMA number will be returned to the sender unopened, at the sender’ s expense.

To obtain an RMA number for Integrated Systems Division products (formerly Chipcom), use the following numbers.

Country Telephone Number Fax Num ber U.S. and Canada (800) 724-2447 (508) 787-3400 Europe (44) (1442) 275860 No Fax Asia Pacific (508) 787-5296 (508) 787-3400

Accessing the 3Com MIB

The 3Com Management Information Base (MIB) for the Integrated Systems Division describe s commands that enable you to manage 3Co m SNMP-based products. The MIB is available over the Internet on an anonymous FTP server. Updates to these MIBs are released as new 3C om products are introduced.

To access Internet versions:

1. FTP to ftp.chipcom.com (151.104.9.65).

2. Enter the login n ame anonymous.

B - 4 Online Ethernet 10BASE-FL Inst allation and Operation Guide

3. Enter your full Internet e-mail add ress as the password (for example, jdoe@company.com).

4. Change to the mib or schema directory using the cd /pub/mibs or cd /pub/ mi bs /s ch em as command.

5. To view the 3Com MIB, OID, or schema entries, enter the dir command.

❑ To pause the display, press [CTRL-S]. ❑ To continue the display, press [CTRL-Q].

6. Copy the MIB, OID, or schema files to your current directory using the appropriate command (for example, get chipcom.mib).

7. To exit the F TP session, invoke the quit command.

3Com Technical Publicatio n s

If you have comments or questions on 3Com Integrated Systems Division T echnical Publications documents, please contact the T echnical Publications group by FAX (508) 229-1551.

Technical Support B - 5

Index

Numerics

10BASE-FL Links

Determine Maximum Distance

10BASE-FL Module

Assign a Network To Configuring, 3-11 Connections, 1-3, 3-10 Connectors, 1-2 Distance Limitations, 2-6, 2-7 Enable/Disable Ports, 3-12 Faceplate, 3-17 Features, 1-1, 1-2 Installing, 3-1, 3-8, 3-9 LEDs, 3-17, 3-18 Network Assignments, 3-19 Optical Power Budget, 2-8 Port Redundancy, 2-27, 2-28, 3-13 Setting the Dip Switches, 3-4 Specifications, A-1, A-5 Troubleshooting, 4-1 Unpacking, 3-2 Used as Network Backbone, 1-3

Used for To-The-Desk Connectivity, 2-23 10BASE-FL Module Configurations, 2-15 3Com Bulletin Board Service (3ComBBS), B-3

, 3-12

, 2-6, 2-7

Activity Indicator, 3-18 All Fiber Network, 2-17 All-10BASE-FL Network

Configuration Rules assign, 3-12

, 2-17

Assign a Channel

Using Dip Switches Assign a Network, 3-12 Audience of Manual, xiii

, 3-8

Backbone Fault Tolerance, 2-31 Backbone Medium, 2-23 Bend Radius, 3-10 Broken Cables

Splicing Bulkhead Barrel Connectors, 2-9 bulletin board service, B-3

, 2-9

Calculate

Maximum 10BASE-FL Distance

Maximum 10BASE-FL Link Distance, 2-6

Maximum Link Distance, 2-10

Network Distances, 2-18

Optical Power Budget, 2-7, 2-8

Splice Insertion Loss, 2-9 Collision Detection, 1-2, 2-15 Configuration Rules, 2-1

All-10BASE-FL Netwo rk, 2-16

Backbone Medium, 2-13

Fiber Backbone, 10BASE-FL To-The-Desk,

2-23

Fiber Backbone, 10BASE-FL to-the-De sk,

2-24

General, 2-3, 2-4

ONline Ethernet Fiber Modules, 2-23

, 2-6

Index 1

Twisted Pair To-The-Desk, 2-20, 2-22

Configuration Topologies

Serial Configuration

Star Configuration, 2-13 Configuring the Module, 3-11 Connect

External Network Devic es Connecting

Fiber Cables Connecting the Module, 3-10 Connector Loss, 2-9 Connector Type Part Numbers, A-6 Connectors, 1-2, A-6

Bulkhead Barrel, 2-9

, A-7

, 2-14, 2-15

, 2-25

Dip Switch Locations, 3-5 Dip Switch Settings

SW1 Switches

SW2 Switches, 3-7, 3-8 Disable

Port Redundancy Disabling Ports, 3-12 Display

Module Configuration

, 3-5, 3- 6

, 3-13

, 3-16

Ethernet Management Module Commands

Configuring the 10BASE-FL Module

External Network Devices

Thin Ethernet Segments

, 2-25, 2-26

, 3-11

Fault-Tolerant Configur ations, 2-31, 2-32 FCC notice, ii Fiber

As Backbone Medium as Backbone Medium, 2-23 Cable Specifications, A-6 Cables, A-7 Connectors, A-6 Equivalent Distances, 2-16, 2-20

Fiber Cable

Diameter

Light Loss, 2-6 Fiber Link Distances, 2-4 Fiber Loss Characteristics, 2-10 Fiber Optic Cable

Bend Radius Fusion Splice, 2-9

, 2-6

, 3-10

, 2-13

Electrostatic Discharge (ESD), 3-2 EMM Management Commands

Showing Module Configurations

Enable

Port Redundancy

Remote Failure Signaling, 3-14 Enable Redundancy, 3-13 Enable/Disable Ports

Using Dip Switch es Enabling Ports, 3-12 Ethernet Four-Repeater Rule, 2-21 Ethernet Management Module, 3-4

2 Index

, 3-13

, 3-7

, 3-16

Grounding Techniques, 3-2

Hot Swap Feature, 3-8

IEEE 802.3 Specification, 2-7, 2-15 Installing the Module, 3-1, 3-3, 3-8, 3-9

Grounding Techniques, 3-2 Precautions, 3-2 Unpacking the Mod ule, 3-2

LAN Product Equivalent Distances, 2-5 LEDs

Interpreting

Location of, 3-17

Monitoring, 3-17

Port Activity LEDs, 4-2

Port LEDs, 3-14

Port Statu s LEDs, 4-3

Redundancy Status LEDs, 3-14

Verify Operation of, 3-19 Link Budget, 2-6, 2-7

, 3-18

Configuration Considerations, 2-23

Equivalent Fiber Distanc e, 2-23 ONline Management Modules, 3-11 on-line technical s ervices, B-1 Optical Fibe r Loss

Characteristics of Optical Power

Receiver

Transmit, 2-7 Optical Power Budget, 2-6, 2-7, 2-8 Optical Power Loss, 2-10

, 2-7

, 2-10

Management Commands

Assign Module to a Network Enable Remote Failure Signaling, 3-15 Enable/Disable Port R edundancy, 3-14 Enable/Disable Ports, 3-12

Saving Module Configurations, 3-15 Mechanical Splice, 2-9, 2- 10 MIB, B-4 Module Configurations

Displaying

Saving, 3-15

, 3-16

, 3-13

Network Configuration Rules

Configuration Rules network supplier support, B-2 No Light Condition, 3-14

, 2-1

ONline 10BAS E-FL Transceiv e r, 3-10, A-5 ONline 10BASE-T Modules , 2-21, 2-26 ONline Controller Mo dule, 3-19

LED Check Button, 3-19 ONline Ethernet Fiber Modules, 3-11

Patch Panels, 2-9 Planning the Network, 2-1 Port Activity LEDs

Troubleshooting With Port LEDs, 3-14 Port Redundancy, 2-28, 3-13, 3-14 Port Status LEDs

Troubleshooting With Primary Link, 3-13

, 4-2

, 4-3

Redundancy Status LED s, 3-14 Redundant Configurations, 2-27, 2-29, 2-30 Redundant Link, 3-13 Remote Failure Signaling, 2-28, 2-30, 4-5

Enable, 3-14 returning products for repair, B-4 RFS

Remote Failure Signaling

, 2-30, 3-14

Save

Module Configuration Serial Configuration, 2-14, 2- 15 Setting the Dip Switches, 3-4 SNMP Commands, B-4

, 3-15

Index 3

Specifications

Environmental General, A-1 Mechanical, A-5 Optical, A-2

Power Requirements, A-4 Splice Insertion Loss, 2-9 Splicing Broken Cables, 2-9

Fusion Splice, 2-9

Mechanical Splice, 2-9 Star Topology, 2-2, 2-13, 2-14

Benefits of, 2-13 Status Indicator, 3-18 Status LED, 3-19

, A-5

Technical Assistanc e, 4-5 Technical Support, 4-5 technical support, B-1 Theory of Operation, 1-3 Thin Ethernet Segments

Connecting To-the-Desk Cabling

Twisted Pair Transceivers

Fiber Equivalent Distances for TriChannel Architecture, 3-12 Troubleshooting

Technical Assistanc e

Using Port Activity LEDs, 4-2

Using Port Status LED s, 4-3

Using the Activity LEDs, 4-2 Twisted Pair Cabling To-The-Desk

10BASE-T Modules

10BASE-T Transceiv e rs, 2-21, 2-22

Configuration Rules, 2-20, 2-22

, 2-25, 2-26

, 2-20

, 4-5

, 2-21, 2-2 2

, 2-20

LED Operation Network Assignment, 3-19

, 3-19

VDE compliance, ii Verify

4 Index

3Com 5104M-FL1 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Audience

Structure of This Guide

Document Conventions

Text Conventions

Notes, Cautions, and Warnings

Related Documents

3Com Documents

Reference Documents

10BASE-FL Module Description

10BASE-FL and FOIRL IEEE Standards Comparison

Theory of Operatio n

Understandi ng the General Rules

Basic Network Rules

LAN Equivalence

Determining Maximum 10B ASE-FL Link Distanc es

Calculating Maximum Link Distance

Determining Link Budget

Atte nua tion

Splicing

Optical Fiber Loss

Maximum Link Distance Calculation

Choosing a Netw ork Bac kb o ne Cabling Structure

Star Configuration

Serial Configuration

10BASE-FL Module Configurations

10BASE-FL Backbone, 10BASE-FL to-the-Desk

Network Distance Calculation Examples

10BASE-FB Fiber Backbone, 10BASE-FL to-the-Desk

Connecting Extern al Netwo rk Devices

Fault-Tolerant Configurations

Configuring Ports for Fault Tolerance

Implementing Backbone Cable Plant Fault Tolerance

Setting Red undancy

Remote Failure Signaling

Implementing Total Backbone Fault Tolerance

Precautionary Procedures

Unpacking Procedures

Quick Install atio n

Setting the Dip Switches

Setting Dip Switch SW1

Setting Dip Switch SW2

Installing the Module

Configuring the Module

Enab ling Port s

Selecting a Network

Enab ling Port Redund ancy

Enabling Remote Failu re Signal ing

Saving Modu le Co nfig uratio n

Showing Mo du le Configu ratio n

Monitorin g the Front Panel

Verifying the LED and Network Assignments

Troubleshooting Usin g the Port Acti vity LEDs

Troubleshooting Using the Port Status LEDs

RFS Troubleshooting

Technical Assistance

General Specific atio ns

Optical Specifications

Transmitter Specifications

Receiver Specifications

Supported Fiber Optic Cables

Fiber Optic Interface

Power Requirements

Environmental Speci fic atio n s

Mechanic al Sp eci fic atio ns

10BASE-FL Cable and Connector Specifications

Fiber Cables and Connectors

Fiber Cables

Fiber Connect ors

Connecting Fiber Cables

On-line Technical Supp ort

Email Technical Support

World Wide Web Site

Support from Your Network Supplie r

Support from 3Com

Return i ng P roducts fo r Repa ir

Accessing the 3Com MIB