Choosing a Network Backbone Cabling Structure | 3Com 5104M-FL1

Choosing a Network Backbone 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 backbone using 10BASE-FL Modules in the ONline 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 plant 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

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3Com 5104M-FL1 installation and operation guide Choosing a Network Backbone Cabling Structure, Star Configuration

Contents

Page Vcci Class 1 Compliance Page 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 Text Convention Example Document ConventionsText Conventions 3Com Documents Related Documents Reference Documents Page Introduction 10BASE-FL Module Description 10BASE-F Standard Description 10BASE-FL and Foirl Ieee Standards ComparisonTheory of Operation BASE-F Standards BASE-FL Module Connections Designing and ExpandingtheNetwork Rule Definition Recommendations/Notes Understanding the General RulesBasic Network Rules Seven Basic Network Rules As equivalent distance. Every Assume that one LAN Product Equivalent LAN EquivalenceLAN Product Equivalent Distances Calculating Maximum Link Distance Determining Maximum 10BASE-FL Link Distances Determining Link Budget ONline to BASE-FL Module Optical Power BudgetCable Size Transmit Receive Optical Link Loss Power DBm Splicing Splice Type Range of Loss dB Typical Loss dB Connector and Splice Insertion LossConnector Type Range of Loss Per Typical Loss dB Pair dB Typical Fiber Loss Characteristics Meter Fiber Link With Mechanical Splice Example Fiber Link With Mechanical Splice Meter Fiber Link Through Two Patch Panels Example Fiber Link Through Patch Panels Choosing a Network Backbone Cabling Structure Star Configuration Star-Wiring Configuration Serial Configuration Serial Configuration Using 10BASE-FL Modules 10BASE-FL Module Configurations 10BASE-FL Backbone, 10BASE-FL to-the-Desk All-10BASE-FL Network with 3 Concentrators Example a Network with 6 Concentrators Example a Network with 3 Concentrators Network with 6 Concentrators Path 10BASE-FL Backbone, Unshielded Twisted Pair to-the-DeskFiber Equivalent Distances Between Transceivers Total Fiber Number Equivalent Example Sample Configuration Distance Calculation Sample Configuration Distance Calculation 10BASE-FB Fiber Backbone, 10BASE-FL to-the-Desk Example Fiber Backbone, 10BASE-FL to-the-Desk Sample Fiber Backbone, 10BASE-FL to-the-Desk Configuration Connecting External Network Devices Ieee 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 Implementing Backbone Cable Plant Fault Tolerance 10. Redundant Fiber Backbone Configuration Remote Failure Signaling 11. Total Backbone Fault-Tolerant Configuration Implementing Total Backbone Fault Tolerance 12. Network With 3 Concentrators ONline Ethernet 10BASE-FL Installation and Operation Guide Installing and Operating the Module Unpacking Procedures Precautionary Procedures Step Procedure Section Title Quick InstallationQuick Installation Procedures Setting the Dip Switches BASE-FL Module Dip Switch Locations Setting Dip Switch SW1 Function Off Default Dip Switch SW1 SettingsFactory Switch Setting Switch Function Factory Default Setting Dip Switch SW2Dip Switch SW2 Settings for Switches 1 to Channel Selection Installing the ModuleDip Switch SW2 Settings for Switches 5 Switch Settings Installing the 10BASE-FL Module BASE-FL Module Connection Configuring the Module Enabling Ports Enabling Port Redundancy Selecting a Network SET Port slot.port Mode Redundant slot.port BASE-FL Modules Connected with Redundancy/RFS Enabled Enabling Remote Failure Signaling Saving Module Configuration Showing Module Configuration Monitoring the Front Panel Shows the location of these indicators BASE-FL Module Faceplate and ONline System Concentrator LED Name Color State Indicates Interpreting the 10BASE-FL Module LEDs Network Check Codes LED State Module Is Configured forVerifying the LED and Network Assignments Troubleshooting Possible Cause Corrective Action State Troubleshooting Using the Port Activity LEDsTroubleshooting Using the Port Activity LEDs LED Name LED State Indication Possible Cause Corrective Action Troubleshooting Using the Port Status LEDsTroubleshooting Using the Port Status LEDs Replace remote device Technical Assistance RFS Troubleshooting ONline Ethernet 10BASE-FL Installation and Operation Guide Specifications Table A-1. General Specifications General Specifications Table A-2. Transmit Power Peak Values Optical SpecificationsTransmitter Specifications 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 Fiber Cables and Connectors 10BASE-FL Cable and Connector Specifications Connector Type Part Number Table A-8. Connector Type Part Number 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 Index RFS VDE compliance Verify LED Operation, 3-19Network Assignment