3Com 510M-FBP Example Network with 8 Concentrators, Network Configured With 8 Concentrators

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

1 km + 1 km + 1 km = 3 km (Rule 5)

4.The remainder is the maximum allowable distance of the link between Concentrators A and C:

4200 m - 570 m - 3000 m = 630 meters

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

Example: Network with 8 Concentrators

Figure 2-7 shows a network with eight connected concentrators. Use this example to determine if the distances between transceivers are all within the 4200 meter maximum network diameter restriction for Ethernet networks.

100m

500m

1km

Conc A

Conc E

Conc C

Transceivers

500m

500m

Conc D

Conc E

500m

Conc F

400m

Conc G

Transceivers

100m

1km

100m

Conc H

Transceivers

100m

Note: All transceiver connections to concentrators are 100 meters

Figure 2-7. Network Configured With 8 Concentrators

2 - 20 ONline Ethernet 10BASE-FB Module Installation and Operation Guide

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Contents Page VDE Class B Compliance Restricted Rights Page Contents Installing and Operating the Module Appendix a Specifications Page Figures Page Tables Page How to Use This Guide AudienceStructure of This Guide Usr/snm/agents Document ConventionsConvention Indicates Example Related Documents 3Com DocumentsSlot ONline System Concentrator Installation and Operation Reference DocumentsPage Introduction 10BASE-FB Module Descriptions Introduction 1 10BASE-FB Compliance Theory of OperationBASE-FB Module Connections 3Com Product Part Number Compatibility With Other Ethernet Fiber ProductsBASE-FB Module Compatibility Designing and Expanding the Network Rules for Configuring a Network Understanding the General RulesBasic Network Rules Rule Definition Recommendations/NotesDefinition 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 Calculating Maximum Link Distance Determining Link BudgetONline 10BASE-FB Module Optical Power Budget Normal Power PowerLink Link Loss DBmONline 10BASE-FB Module Optical Power Budget High Power BASE-FB Optical Power BudgetCable Size Used Transmit Receive Optical Power Micron ONline toAttenuation Connector and Splice Insertion Loss Typical Fiber Loss CharacteristicsExample 1700 Meter Fiber Link With Mechanical Splice Meter Fiber Link With Mechanical SpliceExample 2000 Meter Fiber Link Through Two Patch Panels Meter Fiber Link Through Two Patch PanelsChoosing a Network Backbone Cabling Structure Star Configuration Star-Wiring ConfigurationSerial Configuration Serial Configuration Using 10BASE-FB Modules10BASE-FB Module Configurations Fiber Backbone, Fiber-to-the-DeskAll-Fiber Network Example Network With 3 Concentrators Network With 3 ConcentratorsNetwork Configured With 8 Concentrators Example Network with 8 ConcentratorsFiber Equivalent Distances Between Transceivers Example Sample Configuration Distance Calculation Fiber Backbone, Unshielded Twisted Pair to-the-DeskSample Configuration Distance Calculation Example Connecting a Thin Ethernet 10BASE2 Segment Fiber Backbone, Coaxial ConnectionDesigning 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 Dip Switch S1 Settings for Switches 3 to Port-Switching Module PortModule-Switching Module Channel SelectionSwitch Label Function Factory Switch Setting Default Setting Dip Switch S2Dip Switch S2 Settings Installing the Module Enable/disable Disable Module Low Light Detection Not UsedInstalling the 10BASE-FB Module BASE-FB Module Connection Configuring the Module Enabling Ports Selecting a Network You can enable port redundancy in one of the following ways Enabling Port RedundancyEnabling Optical Power Enabling Low Light WarningShowing Module Configuration Saving Module ConfigurationMonitoring the Front Panel Page Interpreting the 10BASE-FB Module LEDs LED Name Color State IndicatesNetwork 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 General Specifications Table A-1. General SpecificationsOptical Specifications Transmitter SpecificationsTable A-2. Transmit Power Cable Type Normal Power High PowerSupported Fiber Optic Cables Receiver SpecificationsTable A-3. Receiver Specifications Power Requirements Table A-4. Fiber Optic Interface SpecificationsTable A-5. Power Requirements Fiber Optic InterfaceEnvironmental Specifications Mechanical SpecificationsTable A-6. Electrical Specifications Table A-7. Mechanical Specifications10BASE-FB Cable and Connector Specifications 10BASE-FB CablesTable A-8 BASE-FB Module Part Numbers 10BASE-FB ConnectorsPort-Switching Connector Type Technical Support On-line Technical SupportWorld Wide Web Site Support from Your Network SupplierEmail Technical Support Support from 3Com Accessing the 3Com MIB Returning Products for Repair3Com Technical Publications Page Index Installing Link Budget Redundant Link, 3-16Redundancy LED Unpacking Procedures, 3-3Unshielded Twisted Pair Cable