Sample Configuration Distance Calculation | 3Com 510M-FBP specification

Figure 2-8. Sample Configuration Distance Calculation

To determine if your network configuration is legal:

1.Use 4200 m as the maximum network diameter for a pure fiber network as defined by the 802.3 specification.

2.Calculate the equivalent distances for each concentrator, and subtract the total from 4200 (see figures for details).

3.Subtract all cable lengths between the two transceivers and if the result is greater than zero, the configuration is within legal Ethernet limits (Rule 5).

For the configuration shown in Figure 2-8 to work, ensure the fiber equivalent distance between Transceiver A and Transceiver B is less than 4200 meters. As shown in the calculation, there are still 1510 meters left for expansion in this configuration. Therefore, this configuration is legal.

Designing and Expanding the Network 2 - 23

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3Com 510M-FBP, 5102M-FBP, 5104M-FB1 installation and operation guide Sample Configuration Distance Calculation

Contents

Page VDE Class B Compliance Restricted Rights Page Contents Installing and Operating the Module Appendix a Specifications Page Figures Page Tables Page Audience How to Use This Guide Structure of This Guide Usr/snm/agents Document ConventionsConvention Indicates Example 3Com Documents Related Documents Reference Documents Slot ONline System Concentrator Installation and OperationPage Introduction 10BASE-FB Module Descriptions Introduction 1 Theory of Operation 10BASE-FB Compliance BASE-FB Module Connections 3Com Product Part Number Compatibility With Other Ethernet Fiber ProductsBASE-FB Module Compatibility Designing and Expanding the Network Rule Definition Recommendations/Notes Rules for Configuring a NetworkUnderstanding the General Rules Basic Network Rules Definition Recommendations/Notes Is actually equal to 1.1 meters LAN Product Equivalent Fiber Equivalent Fiber DistancesEquivalent Fiber Distances of LAN Products Determining Maximum Fiber Link Distances Determining Link Budget Calculating Maximum Link Distance DBm ONline 10BASE-FB Module Optical Power Budget Normal PowerPower Link Link Loss ONline to ONline 10BASE-FB Module Optical Power Budget High PowerBASE-FB Optical Power Budget Cable Size Used Transmit Receive Optical Power Micron Attenuation Typical Fiber Loss Characteristics Connector and Splice Insertion Loss Meter Fiber Link With Mechanical Splice Example 1700 Meter Fiber Link With Mechanical Splice Meter Fiber Link Through Two Patch Panels Example 2000 Meter Fiber Link Through Two Patch Panels Choosing a Network Backbone Cabling Structure Star-Wiring Configuration Star Configuration Serial Configuration Using 10BASE-FB Modules Serial Configuration Fiber Backbone, Fiber-to-the-Desk 10BASE-FB Module Configurations All-Fiber Network Network With 3 Concentrators Example Network With 3 Concentrators Example Network with 8 Concentrators Network Configured With 8 Concentrators Fiber Equivalent Distances Between Transceivers Fiber Backbone, Unshielded Twisted Pair to-the-Desk Example Sample Configuration Distance Calculation Sample Configuration Distance Calculation Fiber Backbone, Coaxial Connection Example Connecting a Thin Ethernet 10BASE2 Segment Designing and Expanding the Network 2 Standard Redundant Configuration In this configuration Fault-Tolerant ConfigurationsConfiguring Ports for Fault Tolerance Setting Redundancy 10. Redundant Fiber Backbone Configuration Implementing Total Backbone Fault Tolerance 11. Total Backbone Fault-Tolerant Configuration 12. Fiber Network With 3 Concentrators Page Installing and Operating the Module Precautionary Procedures Unpacking Procedures Step Procedure Section Title Quick InstallationQuick Installation Procedures Setting the Dip Switches BASE-FB Module Dip Switch Locations Switch Label Function Factory Switch Setting Default Off Setting Dip Switch S1Dip Switch S1 Settings for Switches 1 Channel Selection Dip Switch S1 Settings for Switches 3 toPort-Switching Module Port Module-Switching Module Switch Label Function Factory Switch Setting Default Setting Dip Switch S2Dip Switch S2 Settings Enable/disable Disable Module Low Light Detection Not Used Installing the Module Installing the 10BASE-FB Module BASE-FB Module Connection Configuring the Module Enabling Ports Selecting a Network Enabling Port Redundancy You can enable port redundancy in one of the following ways Enabling Low Light Warning Enabling Optical Power Saving Module Configuration Showing Module Configuration Monitoring the Front Panel Page LED Name Color State Indicates Interpreting the 10BASE-FB Module LEDs Network Check Codes LED State Network ConfigurationVerifying LED and Network Assignments Troubleshooting Possible Cause Corrective Action Troubleshooting Using the Port Activity LEDsTroubleshooting Using the Port Activity LEDs LED State Indication Possible Cause Corrective Action Troubleshooting Using the Port Status LEDsTroubleshooting Using the Port Status LEDs Troubleshooting Using the Port Status LEDs Troubleshooting Using the Port Status LEDs 10BASE-FL Technical Assistance Page Specifications Table A-1. General Specifications General Specifications Cable Type Normal Power High Power Optical SpecificationsTransmitter Specifications Table A-2. Transmit Power Supported Fiber Optic Cables Receiver SpecificationsTable A-3. Receiver Specifications Fiber Optic Interface Power RequirementsTable A-4. Fiber Optic Interface Specifications Table A-5. Power Requirements Table A-7. Mechanical Specifications Environmental SpecificationsMechanical Specifications Table A-6. Electrical Specifications 10BASE-FB Cables 10BASE-FB Cable and Connector Specifications Table A-8 BASE-FB Module Part Numbers 10BASE-FB ConnectorsPort-Switching Connector Type On-line Technical Support Technical Support World Wide Web Site Support from Your Network SupplierEmail Technical Support Support from 3Com Returning Products for Repair Accessing the 3Com MIB 3Com Technical Publications Page Index Installing Link Budget Redundant Link, 3-16Redundancy LED Unpacking Procedures, 3-3Unshielded Twisted Pair Cable