3Com 5104M-FL1 Example Fiber Link Through Patch Panels, Meter Fiber Link Through Two Patch Panels

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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.

.

Patch 1700 meters Patch

Panel

Panel

Connectors

Connectors

1.7 Km Fiber Cable

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

Two ST Patch Panel

1.5 dB loss worst case

Path Loss

10.0

dB

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

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Contents Page Vcci Class 1 Compliance Page Page Contents Installing and Operating the Module Appendix a Specifications Page Figures Page Tables Page How to Use This Guide AudienceStructure of This Guide Text Conventions Document ConventionsText Convention Example Related Documents 3Com DocumentsReference Documents Page Introduction 10BASE-FL Module Description BASE-F Standards 10BASE-FL and Foirl Ieee Standards ComparisonTheory of Operation 10BASE-F Standard DescriptionBASE-FL Module Connections Designing and ExpandingtheNetwork Seven Basic Network Rules Understanding the General RulesBasic Network Rules Rule Definition Recommendations/NotesAs equivalent distance. Every Assume that one LAN Product Equivalent Distances LAN EquivalenceLAN Product Equivalent Determining Maximum 10BASE-FL Link Distances Calculating Maximum Link DistanceDetermining Link Budget DBm BASE-FL Module Optical Power BudgetCable Size Transmit Receive Optical Link Loss Power ONline toSplicing Typical Fiber Loss Characteristics Connector and Splice Insertion LossConnector Type Range of Loss Per Typical Loss dB Pair dB Splice Type Range of Loss dB Typical Loss dBExample Fiber Link With Mechanical Splice Meter Fiber Link With Mechanical SpliceExample Fiber Link Through Patch Panels Meter Fiber Link Through Two Patch PanelsStar Configuration Choosing a Network Backbone Cabling StructureSerial Configuration Star-Wiring Configuration10BASE-FL Module Configurations Serial Configuration Using 10BASE-FL Modules10BASE-FL Backbone, 10BASE-FL to-the-Desk All-10BASE-FL Network with 3 Concentrators Example a Network with 3 Concentrators Example a Network with 6 ConcentratorsNetwork with 6 Concentrators Total Fiber Number Equivalent 10BASE-FL Backbone, Unshielded Twisted Pair to-the-DeskFiber Equivalent Distances Between Transceivers PathExample Sample Configuration Distance Calculation Sample Configuration Distance Calculation 10BASE-FB Fiber Backbone, 10BASE-FL to-the-Desk Sample Fiber Backbone, 10BASE-FL to-the-Desk Configuration Example Fiber Backbone, 10BASE-FL to-the-DeskConnecting External Network Devices Example Connecting a Thin Ethernet 10BASE2 Segment IeeeDesigning and Expanding the Network 2 Configuring Ports for Fault Tolerance Fault-Tolerant ConfigurationsStandard Redundant Configuration In this configuration Implementing Backbone Cable Plant Fault Tolerance Setting Redundancy10. Redundant Fiber Backbone Configuration Remote Failure Signaling Implementing Total Backbone Fault Tolerance 11. Total Backbone Fault-Tolerant Configuration12. Network With 3 Concentrators ONline Ethernet 10BASE-FL Installation and Operation Guide Installing and Operating the Module Precautionary Procedures Unpacking ProceduresQuick Installation Procedures Quick InstallationStep Procedure Section Title Setting the Dip Switches Setting Dip Switch SW1 BASE-FL Module Dip Switch LocationsFactory Switch Setting Dip Switch SW1 SettingsFunction Off Default Dip Switch SW2 Settings for Switches 1 to Setting Dip Switch SW2Switch Function Factory Default Switch Settings Installing the ModuleDip Switch SW2 Settings for Switches 5 Channel SelectionInstalling the 10BASE-FL Module BASE-FL Module Connection Configuring the Module Enabling Ports Selecting a Network Enabling Port RedundancySET Port slot.port Mode Redundant slot.port Enabling Remote Failure Signaling BASE-FL Modules Connected with Redundancy/RFS EnabledShowing Module Configuration Saving Module ConfigurationShows the location of these indicators Monitoring the Front PanelBASE-FL Module Faceplate and ONline System Concentrator Interpreting the 10BASE-FL Module LEDs LED Name Color State IndicatesVerifying the LED and Network Assignments LED State Module Is Configured forNetwork Check Codes Troubleshooting LED Name Troubleshooting Using the Port Activity LEDsTroubleshooting Using the Port Activity LEDs Possible Cause Corrective Action StateTroubleshooting Using the Port Status LEDs Troubleshooting Using the Port Status LEDsLED State Indication Possible Cause Corrective Action Replace remote device RFS Troubleshooting Technical AssistanceONline Ethernet 10BASE-FL Installation and Operation Guide Specifications General Specifications Table A-1. General SpecificationsTransmitter Specifications Optical SpecificationsTable A-2. Transmit Power Peak Values Table A-3. Receiver Specifications Receiver SpecificationsSupported Fiber Optic Cables Table A-5. Power Requirements Power RequirementsTable A-4. Fiber Optic Interface Specifications Fiber Optic InterfaceTable A-6. Electrical Specifications Environmental SpecificationsMechanical Specifications Table A-7. Mechanical Specifications10BASE-FL Cable and Connector Specifications Fiber Cables and ConnectorsTable A-8. Connector Type Part Number Connector Type Part NumberTechnical Support On-line Technical SupportEmail Technical Support Support from Your Network SupplierWorld Wide Web Site Support from 3Com Accessing the 3Com MIB Returning Products for Repair3Com Technical Publications Page Index Index RFS VDE compliance Verify LED Operation, 3-19Network Assignment