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ONline Ethernet 10BASE-FB Module Installation and Operation Guide
Document Number 17-00328-5
Printed February 1996
Model Number: 510M-FBP
5102M-FBP
5104M-FB1
3Com Corporation
118 Turnpike Road
Southborough, MA 01772-1886
U.S.A.
(508) 460-8900
FAX (508) 460-8950
Federal Communications Commission
Notice
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case you must correct the interference at your own expense.
Canadian Emissions Requirements
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.
VDE Class B Compliance
Hiermit wird bescheinigt, dass der 510M-FBP 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 510M-FBP is shielded against radio interference in accordance with the provisions of Vfg 243/1991.
The German Postal Services have been advised that this equipment is being placed on the market and that they have been given the right to inspect the series for compliance with regulations.
Compliance with applicable regulations depends on the use of shielded cables. The user is responsible for procuring the appropriate cables.
EN55022/CISPR22 Compliance
This equipment conforms to the Class A emissions limits for a digital device as defined by EN55022 (CISPR22).
VCCI Class 1 Compliance
This equipment is in the 1st Class category (information equipment to be used in commercial or industrial areas) and conforms to the
standards set by the Voluntary Control Council for Interference by Information Technology Equipment aimed at preventing radio interference in commercial or industrial areas.
Consequently, when the equipment is used in a residential area or in an adjacent area, radio interference may be caused to radio and TV receivers, and so on.
Read the instructions for correct handling.
Fiber Cable Classification Notice
Use this equipment only with fiber cable classified by Underwriters Laboratories as to fire and smoke characteristics in accordance with Section 770-2(b) and Section 725-2(b) of the National Electrical Code.
UK General Approval Statement
The ONcore Switching Hub, ONline System Concentrator, and ONsemble StackSystem Hub are manufactured to the International Safety Standard EN 60950 and are approved in the UK under the General Approval Number NS/G/12345/J/100003 for indirect connection to the public telecommunication network.
Disclaimer
The information in this document is subject to change without notice and should not be construed as a commitment by 3Com Corporation. 3Com Corporation assumes no responsibility for any errors that may appear in this document.
Copyright Statement
©1996 by 3Com Corporation. Printed in U.S.A. All rights reserved. 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 and Patents
Because of the nature of this material, numerous hardware and software products are mentioned by name. In most, if not all cases, these product names are claimed as trademarks by the companies that manufacture the products. It is not the intent of 3Com Corporation to claim these names or trademarks as its own.
3Com, Artel, Boundary Routing, CardBoard, CardFacts, Galactica, EtherDisk, EtherLink, EtherLink II, EtherLink Plus, LANplex, LANsentry, LinkBuilder, NETBuilder, NETBuilder II, NetFacts, ONcore, ONsemble, ORnet, Parallel Tasking, SmartAgent, StarBridge, TokenLink, TokenLink Plus, TriChannel, and ViewBuilder are registered trademarks of 3Com Corporation.
3Com Laser Library, 3Com OpenHub, 3TECH, FDDILink, FMS, G-Man, MultiProbe, NetProbe, OnDeck, ONdemand, ONline, PowerRing, StackJack, StackSystem, StackWay, Star-Tek, SwitchCentral, and Transcend are trademarks of 3Com Corporation.
3ComFacts and Ask3Com are service marks of 3Com Corporation.
ii ONline Ethernet 10BASE-FB Module Installation and Operation Guide
The 3Com Multichannel Architecture Communications System is registered under U.S. Patent Number 5,301,303.
AT&T is a registered trademark of American Telephone and Telegraph Company.
Banyan and VINES are registered trademarks of Banyan Systems Inc.
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ProComm is a registered trademark of DATASTORM TECHNOLOGIES, INC.
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DEC, DECnet, DELNI, POLYCENTER, VAX, VT100, VT220, and the Digital logo are trademarks of Digital Equipment Corporation.
Hayes is a registered trademark of Hayes Microcomputer Products.
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AIX, IBM, and NetView are registered trademarks of International Business Machines Corporation.
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Windows is a trademark of Microsoft Corp.
OSF and OSF/Motif are registered trademarks of Open Software Foundation, Inc.
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NetWare and Novell are registered trademarks of Novell, Incorporated.
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3Com registered trademarks are registered in the United States, and may or may not be registered in other countries. Other brand and product names may be registered trademarks or trademarks of their respective holders.
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Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1) (ii) of the Rights in Technical Data and Computer Software clause at
DFARS 252.227-7013.
Printed on recycled paper.
ONline Ethernet 10BASE-FB Module Installation and Operation Guide iii
iv ONline Ethernet 10BASE-FB Module Installation and Operation Guide
Contents
How to Use This Guide
Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii Structure of This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi 3Com Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi Reference Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xvii
Chapter 1 — Introduction
10BASE-FB Module Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2 10BASE-FB Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4 Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4 Compatibility With Other Ethernet Fiber Products . . . . . . . . . . . . . . . . . . . .1-6
Chapter 2 — Designing and Expanding the Network
Understanding the General Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2 Rules for Configuring a Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2 Equivalent Fiber Distances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5 Determining Maximum Fiber Link Distances . . . . . . . . . . . . . . . . . . . . . . . .2-6 Calculating Maximum Link Distance . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7 Determining Link Budget . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10 Splicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10 Optical Fiber Loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11 Maximum Link Distance Calculation . . . . . . . . . . . . . . . . . . . . . . .2-12 Choosing a Network Backbone Cabling Structure . . . . . . . . . . . . . . . . . . .2-14 Star Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-15 Serial Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-16 10BASE-FB Module Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-17 Fiber Backbone, Fiber-to-the-Desk . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-17
ONline Ethernet 10BASE-FB Module Installation and Operation Guide v
Network Distance Calculation Examples . . . . . . . . . . . . . . . . . . . .2-19 Fiber Backbone, Unshielded Twisted Pair to-the-Desk . . . . . . . . . . . . .2-22 Fiber Backbone, Coaxial Connection . . . . . . . . . . . . . . . . . . . . . . . . . .2-24 Fault-Tolerant Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-26 Configuring Ports for Fault Tolerance . . . . . . . . . . . . . . . . . . . . . . . . .2-26 Setting Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-27 Implementing Total Backbone Fault Tolerance . . . . . . . . . . . . . . . . . .2-29
Chapter 3 — Installing and Operating the Module
Precautionary Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Unpacking Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Quick Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Setting the Dip Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
Setting Dip Switch S1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7
Setting Dip Switch S2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9
Installing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-10
Configuring the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13
Enabling Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-14
Selecting a Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-15
Enabling Port Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-16
Enabling Low Light Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-17
Enabling Optical Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-17
Saving Module Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-18
Showing Module Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-18
Monitoring the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-19
Verifying LED and Network Assignments . . . . . . . . . . . . . . . . . . . . . . . . .3-22
Chapter 4 — Troubleshooting
Troubleshooting Using the Port Activity LEDs . . . . . . . . . . . . . . . . . . . . . . .4-2 Troubleshooting Using the Port Status LEDs . . . . . . . . . . . . . . . . . . . . . . . .4-3 Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7
vi ONline Ethernet 10BASE-FB Module Installation and Operation Guide
Appendix A — Specifications
General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2 Optical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3 Transmitter Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3 Receiver Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4 Supported Fiber Optic Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4 Fiber Optic Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5 Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6 Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6 3Com 10BASE-FB Network Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6 10BASE-FB Cable and Connector Specifications . . . . . . . . . . . . . . . . . . . . . A-7 10BASE-FB Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7 10BASE-FB Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8 Connecting Fiber Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
Appendix B — Technical Support
On-line Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1 Email Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2 World Wide Web Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2 Support from Your Network Supplier . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2 Support from 3Com . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-3 Returning Products for Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-4 Accessing the 3Com MIB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-4 3Com Technical Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-5
Index
ONline Ethernet 10BASE-FB Module Installation and Operation Guide vii
viii ONline Ethernet 10BASE-FB Module Installation and Operation Guide
Figures
Figure 1-1. 10BASE-FB Module Connections . . . . . . . . . . . . . . . . . . . . .1-5 Figure 2-1. 1700 Meter Fiber Link With Mechanical Splice . . . . . . . . .2-12 Figure 2-2. 2000 Meter Fiber Link Through Two Patch Panels . . . . . . .2-13 Figure 2-3. Star-Wiring Configuration . . . . . . . . . . . . . . . . . . . . . . . . .2-15 Figure 2-4. Serial Configuration Using 10BASE-FB Modules . . . . . . . . .2-16 Figure 2-5. All-Fiber Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-18 Figure 2-6. Network With 3 Concentrators . . . . . . . . . . . . . . . . . . . . .2-19 Figure 2-7. Network Configured With 8 Concentrators . . . . . . . . . . . .2-20 Figure 2-8. Sample Configuration Distance Calculation . . . . . . . . . . . .2-23 Figure 2-9. Thin Ethernet Segment Connected to an ONline
10BASE-FB Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-24 Figure 2-10. Redundant Fiber Backbone Configuration . . . . . . . . . . . . .2-28 Figure 2-11. Total Backbone Fault-Tolerant Configuration . . . . . . . . . . .2-30 Figure 2-12. Fiber Network With 3 Concentrators . . . . . . . . . . . . . . . .2-31 Figure 3-1. 10BASE-FB Module Dip Switch Locations . . . . . . . . . . . . . .3-6 Figure 3-2. Installing the 10BASE-FB Module . . . . . . . . . . . . . . . . . . .3-11 Figure 3-3. 10BASE-FB Module Connection . . . . . . . . . . . . . . . . . . . .3-12 Figure 3-4. 10BASE-FB Port-Switching Module Faceplate and
ONline System Concentrator . . . . . . . . . . . . . . . . . . . . . .3-20
ONline Ethernet 10BASE-FB Module Installation and Operation Guide ix
x ONline Ethernet 10BASE-FB Module Installation and Operation Guide
Tables
Table 1-1. 10BASE-FB Module Compatibility. . . . . . . . . . . . . . . . . . . . .1-6 Table 2-1. Basic Network Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2 Table 2-2. Equivalent Fiber Distances of LAN Products . . . . . . . . . . . . .2-5 Table 2-3. ONline 10BASE-FB Module Optical Power Budget:
Normal Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8 Table 2-4. ONline 10BASE-FB Module Optical Power Budget:
High Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9 Table 2-5. 10BASE-FB Optical Power Budget . . . . . . . . . . . . . . . . . . . .2-9 Table 2-6. Connector and Splice Insertion Loss. . . . . . . . . . . . . . . . . .2-11 Table 2-7. Typical Fiber Loss Characteristics . . . . . . . . . . . . . . . . . . . .2-11 Table 2-8. Fiber Equivalent Distances Between Transceivers . . . . . . . .2-21 Table 3-1. Quick Installation Procedures. . . . . . . . . . . . . . . . . . . . . . . .3-4 Table 3-2. Dip Switch S1 Settings for Switches 1 and 2 . . . . . . . . . . . .3-7 Table 3-3. Dip Switch S1 Settings for Switches 3 to 10. . . . . . . . . . . . .3-8 Table 3-4. Dip Switch S2 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9 Table 3-5. Interpreting the 10BASE-FB Module LEDs. . . . . . . . . . . . . .3-21 Table 3-6. Network Check Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-22 Table 4-1. Troubleshooting Using the Port Activity LEDs . . . . . . . . . . . .4-2 Table 4-2. Troubleshooting Using the Port Status LEDs. . . . . . . . . . . . .4-3
ONline Ethernet 10BASE-FB Module Installation and Operation Guide xi
How to Use This Guide
This guide is designed to help you understand the features, indicators, and installation procedures for the:
3Com ONline™ Ethernet Port-Switching 10BASE-FB Modules (Model Numbers 5102M-FBP and 5104M-FBP)
3Com ONline™ Ethernet 10BASE-FB Module (Model Number 5104M-FB1)
This guide also contains information on troubleshooting and diagnostics for operation verification. In addition, a configuration section provides you with network configuration information.
Audience
This guide contains instructions for installing the modules and maintaining normal operation. It is intended for the following people at your site:
Hardware installer
System/Network manager
ONline Ethernet 10BASE-FB Module Installation and Operation Guide xiii
Structure of This Guide
This guide contains the following chapters:
Chapter 1, Introduction – Introduces the principal features of the ONline Ethernet Port-Switching 10BASE-FB Modules and the ONline Ethernet 10BASE-FB Module.
Chapter 2, Designing and Expanding the Network – Contains configuration information to help you integrate the 10BASE-FB Modules into your Ethernet network.
Chapter 3, Installing and Operating the Module – Provides illustrated procedures for installing the 10BASE-FB Modules into the ONline System Concentrator and configuring them for operation. This chapter also provides a front panel view of the 10BASE-FB Modules showing ports, LEDs, and dip switches.
Chapter 4, Troubleshooting – Provides help in isolating and correcting problems that could arise during the installation process and during normal operation.
Appendix A, Specifications – Describes product dimensions, power requirements, and other specifications for the modules.
Appendix B, Technical Support – Lists the various methods for contacting the 3Com technical support organization and for accessing other product support services.
Index – Contains an alphabetical list of important terms and features referenced throughout this guide.
xiv ONline Ethernet 10BASE-FB Module Installation and Operation Guide
Document Conventions
The following document conventions are used in this manuall:
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ONline Ethernet 10BASE-FB Module Installation and Operation Guide xv
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Related Documents
This section provides information on supporting documentation, including:
3Com Documents
Reference Documents
3Com Documents
The following documents provide additional information on 3Com products:
17-Slot ONline System Concentrator Installation and Operation Guide – Explains how to install, operate, and manage the 3Com ONline 17-Slot System Concentrator (Models 5017C-LS and 5017C with load sharing).
xvi ONline Ethernet 10BASE-FB Module Installation and Operation Guide
6-Slot ONline System Concentrator Installation and Operation
Guide – Explains how to install, operate, and manage the 3Com ONline 6-Slot System Concentrator.
ONline Ethernet Management Module Installation and Operation Guide –
Describes how to install the ONline Ethernet Management Module in the ONline System Concentrator and explains the LEDs on the module faceplate. This guide also provides instructions for connecting a terminal to the module and describes the management commands necessary to perform management tasks on the concentrator and on remote devices.
ONline Management Commands Guide – Provides an alphabetized reference resource describing all ONline management commands.
For a complete list of 3Com documents, contact your 3Com representative.
Reference Documents
The following documents supply related background information:
Case, J., Fedor, M., Scoffstall, M., and J. Davin, The Simple Network Management Protocol, RFC 1157, University of Tennessee at Knoxville, Performance Systems International and the MIT Laboratory for Computer Science, May 1990.
Rose, M., and K. McCloghrie, Structure and Identification of Management Information for TCP/IP-based Internets, RFC 1155, Performance Systems International and Hughes LAN Systems, May 1990.
ONline Ethernet 10BASE-FB Module Installation and Operation Guide xvii
1Introduction
This chapter introduces you to the:
3Com ONline™ Ethernet Port-Switching 10BASE-FB Modules (5102M-FBP and 5104M-FBP)
3Com ONline™ Ethernet 10BASE-FB Module (5104M-FB1)
The modules are referred throughout this guide as the 10BASE-FB Modules. Information in this guide refers to all three 10BASE-FB Modules listed above. Differences between the modules are noted where applicable.
This chapter contains the following sections:
10BASE-FB Module Descriptions
10BASE-FB Compliance
10BASE-FB Theory of Operation
Compatibility With Other Ethernet Fiber Products
Introduction 1 - 1
10BASE-FB Module Descriptions
The ONline Ethernet Port-Switching 10BASE-FB Module is a 2- or 4-port, Ethernet fiber module designed for 3Com ONline System Concentrators. The ONline Ethernet 10BASE-FB Module is a 4-port, Ethernet fiber module also designed for 3Com ONline System Concentrators.
The ONline Ethernet Port-Switching 10BASE-FB Module (Model Number 5104M-FBP) is functionally identical to the ONline Ethernet 10BASE-FB Module (Model Number 5104M-FB1) except for the Port-Switching Module's ability to set each port to an independent backplane network in the concentrator.
The 5104M-FB1 is module-switching only. You can update the 10BASE-FB Module to a port-switching module by installing the ONline Ethernet 10BASE-FB Upgrade Kit.
The 10BASE-FB Modules provide:
Fiber backbone connectivity for Ethernet local area networks
Direct fiber to-the-desk connectivity
You can directly connect the 10BASE-FB Modules to any other ONline fiber module as well as all of the products in the 3Com 10BASE-FB family, including the:
3Com 10BASE-FB Star Coupler
3Com 10BASE-FB Fiber Transceiver
3Com Fault-Tolerant 10BASE-FB Transceiver The 10BASE-FB Modules:
Provide up to 4.0 kilometers distance between any two concentrators
Support network diameters up to 4.2 kilometers
Contain built-in link redundancy for fault tolerance
1 - 2 ONline Ethernet 10BASE-FB Module Installation and Operation Guide
Include diagnostics for troubleshooting
Provide 10 Mbps performance with 100 percent collision detection using CSMA/CD
Support 50, 62.5, 85, and 100 μm fiber cable
Are shipped with either ST, SMA, or FC-type connectors
Other benefits of the 10BASE-FB Modules include:
3Com TriChannel Architecture - The 10BASE-FB Modules operate in an ONline System Concentrator with all ONline modules, including Token Ring and FDDI.
Slot Independence - You can install modules into any available slot in the ONline Concentrator. This flexibility eliminates the need to shut down the network and rearrange the existing configuration of the concentrator when you install new modules into the concentrator.
“Hot Swap” Capability - You can install or remove modules from the ONline System Concentrator when it is powered up without affecting the operation of any other modules in the concentrator.
Independent Networks - You can assign each module to any of three independent Ethernet networks.
Management Support - You can manage the module through the 3Com ONdemand™ Network Control System. You may also manage the 10BASE-FB modules using terminal management through an ONline network management module.
Compliance - The 10BASE-FB Modules comply with the IEEE 10BASE-FB fiber standard to provide interoperability with other standards-based products.
Introduction 1 - 3
10BASE-FB Compliance
The ONline Ethernet Port-Switching 10BASE-FB Modules and the ONline Ethernet 10BASE-FB Module are fully compliant with the IEEE 10BASE-FB fiber standard. The IEEE ratification of the 10BASE-FB standard validates synchronous fiber Ethernet as the choice for backbone links. Synchronous technology provides robust transmission for fiber Ethernet backbones.
Compliance with the 10BASE-FB standard allows 3Com fiber modules to be compatible with:
Industry 10BASE-FB-compliant products
Existing 3Com 10BASE-FB technology
3Com 10BASE-FB Modules implement Ethernet/IEEE 802.3 physical layer functionality on a fiber optic medium. Full interconnection of all devices that comply with Ethernet V2.0 or IEEE 802.3 specifications are provided, including:
Minicomputers
Engineering workstations
PC networking servers
Bridges
Theory of Operation
The 10BASE-FB Modules serve mainly as network backbone links. Network backbone links connect concentrators together. You may also use the 10BASE-FB Modules to connect directly to devices using the:
3Com 5101T-FB Transceiver
3Com 5102T-FBFT Fault-Tolerant Transceiver
1 - 4 ONline Ethernet 10BASE-FB Module Installation and Operation Guide
Figure 1-1 illustrates a configuration using fiber transceivers and the 10BASE-FB Modules to connect concentrators and devices
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Figure 1-1. 10BASE-FB Module Connections
Introduction 1 - 5
Compatibility With Other Ethernet Fiber Products
The 10BASE-FB Modules are compatible with the 3Com products outlined in Table 1-1.
Table 1-1. 10BASE-FB Module Compatibility
3Com Product |
Part Number |
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10BASE-FB Star Coupler |
9308S-FB |
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10BASE-FB Transceiver |
5101T-FB |
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Fault-Tolerant 10BASE-FB Transceiver |
5102T-FBFT |
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From the backplane interface, you can also connect the 10BASE-FB Modules to other Ethernet modules on the same network.
Caution: The 10BASE-FB Modules are not compatible with the ONline Ethernet 10BASE-FL Module (Model Number 5104M-FL1). The 4-port10BASE-FL Module faceplate is similar to the 10BASE-FB Modules, but the two modules cannot communicate.
1 - 6 ONline Ethernet 10BASE-FB Module Installation and Operation Guide
2Designing and
Expanding the Network
This chapter contains configuration information to help you design your network. It describes how to configure networks using the ONline System Concentrator and the ONline 10BASE-FB Modules. It also provides examples of network cabling structures and Ethernet network cabling solutions.
This chapter contains the following sections:
Understanding the General Rules
Determining Maximum Fiber Link Distances
Choosing a Network Backbone Cabling Structure
10BASE-FB Module Configurations
Fault-Tolerant Configurations
Note: To ensure proper operation of your network, install all equipment using only approved cables. Refer to Appendix A for information on cable requirements.
Designing and Expanding the Network 2 - 1
Understanding the General Rules
This section describes general rules for configuring an Ethernet network using fiber as the backbone medium. It also provides rules to ensure that your network configuration conforms to distance limitations imposed by Ethernet and networking equipment. Use these guidelines for building your network.
Refer to the sections that follow for specific rules for:
Determining maximum 10BASE-FB fiber link distances
Connecting various horizontal media types (10BASE-FB, twisted pair) to a 10BASE-FB backbone
Examples of recommended fault-tolerant configurations
Rules for Configuring a Network
This section outlines the network rules and recommendations for building an Ethernet network. For more hardware-specific information on the 10BASE-FB, refer to Appendix A.
Table 2-1. Basic Network Rules
Rule |
Definition |
Recommendations/Notes |
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1 |
Use 10BASE-FB as the |
Use 62.5 micron cable to |
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backbone medium. |
conform with the IEEE 10BASE-F |
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and ANSI FDDI standards. |
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Use ST-type connectors. |
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2 |
Wire the backbone in a |
Lay extra fiber cables. The extra |
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star topology to isolate |
cost is small and you will need |
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faults. |
them as your network grows. |
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2 - 2 ONline Ethernet 10BASE-FB Module Installation and Operation Guide
Table 2-1. |
Basic Network Rules (Continued) |
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Rule |
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Definition |
Recommendations/Notes |
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2 |
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Wire the backbone in a |
The star topology conforms to |
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(con’t) |
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star topology to isolate |
FDDI wiring. Run at least two |
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faults. |
fiber strands to each backbone |
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connection. |
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3 |
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Do not exceed the |
The 4200 meters is the |
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maximum Fiber Ethernet |
maximum distance between |
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network diameter of |
any two transceivers on the |
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4200 meters of fiber |
network. |
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cable. |
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The 4200 meters does not |
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include the transceiver cable |
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that connects a device with an |
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external transceiver. |
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Transceiver cable can extend up |
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to 50 meters. Thus, total |
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network diameter can be as |
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much as 4300 meters (4200 m + |
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2 * 50 m) between any two |
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modes. |
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4 |
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Certain LAN products |
Each microsecond delay |
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on the network shrink |
through a device on the |
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the maximum Fiber |
network shrinks the network |
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Ethernet network |
diameter by approximately 200 |
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diameter to less than |
meters of fiber cable. This |
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4200 meters. |
reduction is known as |
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equivalent distance. Table 2-2 |
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lists the equivalent fiber |
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distances for 3Com ONline LAN |
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products. |
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Designing and Expanding the Network 2 - 3
Table 2-1. |
Basic Network Rules (Continued) |
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Rule |
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Definition |
Recommendations/Notes |
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5 |
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Assume that one meter |
This is a conservative |
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of coaxial or twisted |
equivalence. One meter of fiber |
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pair cable is equal to |
is actually equal to 1.1 meters of |
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one meter of fiber |
coaxial. For simplicity, assume |
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cable. |
one meter. |
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6 |
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Verify that the |
In general, on 62.5 cable, use |
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10BASE-FB link |
up to 4000 meters |
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distances do not |
point-to-point using the |
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exceed the limits |
10BASE-FB Modules. If you |
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imposed by the optical |
have poor quality cable or |
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power budget. |
numberous patch panels, you |
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may have to sacrifice some |
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distance. |
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Some older Ethernet fiber optic |
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products are less powerful than |
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ONline 10BASE-FB Module |
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optics. When connecting to |
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these products, remember that |
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they determine the maximum |
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point-to-point distance. |
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7 |
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When in doubt, use a |
If you are not certain you have |
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bridge. |
exceeded acceptable network |
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distances, use a bridge to |
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extend the network. |
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2 - 4 ONline Ethernet 10BASE-FB Module Installation and Operation Guide
Equivalent Fiber Distances
Equivalent fiber distance is the sum of both the incoming and outgoing module port signals. Different products, however, have different equivalent distances. Table 2-2 lists the equivalent fiber distance of 3Com ONline LAN products.
Table 2-2. Equivalent Fiber Distances of LAN Products
LAN Product |
Equivalent Fiber |
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Distance (meters) |
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ONline Ethernet 10BASE-FB Modules |
190 |
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(5104M-FB1, 5102M-FBP, 5104M-FBP) |
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Incoming signal to fiber port |
140 |
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Outgoing signal from fiber port |
50 |
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ONline Ethernet 10BASE-FL Module (5104M-FL1) |
560 |
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Incoming signal to fiber port |
330 |
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Outgoing signal from fiber port |
230 |
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ONline Ethernet 10BASE-T Module (5108M-TP) |
585 |
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Incoming signal to TP port |
420 |
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Outgoing signal from TP port |
165 |
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ONline Ethernet 50-Pin Module |
585 |
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(5112M-TPL, 5112M-TPPL) |
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Incoming signal to TP port |
420 |
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Outgoing signal from TP port |
165 |
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ONline Ethernet 24-Port Module (5124M-TPCL,) |
585 |
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Incoming signal to TP port |
420 |
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Outgoing signal from TP port |
165 |
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Designing and Expanding the Network 2 - 5
Table 2-2. Equivalent Fiber Distances of LAN Products (Continued)
LAN Product |
Equivalent Fiber |
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Distance (meters) |
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ONline Ethernet Repeater Module (5102M-AUIF) |
800 |
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Incoming signal to AUI port |
600 |
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Outgoing signal from AUI port |
200 |
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ONline Ethernet BNC Module (5106M-BNC) |
900 |
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Incoming signal to BNC port |
450 |
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Outgoing signal from BNC port |
450 |
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ONline Ethernet Transceiver Module (5103M-AUIM) |
0 |
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3Com 10BASE-FB Star Coupler (9308S-FB) |
180 |
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10BASE-FB Star Coupler (9314S) |
180 |
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IEEE Repeater |
800 |
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Determining Maximum Fiber Link Distances
This section describes how to calculate the maximum allowable link distances between two fiber ports. To do this, you must know the following information:
10BASE-FB optical 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 patch panel connections and link splices
2 - 6 ONline Ethernet 10BASE-FB Module Installation and Operation Guide
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