3Com 5104M-FL1 BASE-FL Module Optical Power Budget, DBm, ONline to

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Note: The values in Table 2-3 are peak power values. You determine average optical power by subtracting 3 dBm from the peak value. All of the examples provided in the pages that follow refer to peak optical power. Note that higher optical power is represented by a smaller negative number (for example, -12 dBm is greater than -20 dBm).

Table 2-3. 10BASE-FL Module Optical Power Budget

	Cable Size	Transmit	Receive	Optical	Link Loss
	Cable Size	Power	Power	Power	Required
	Used	Power	Power	Power	Required
	Used	(dBm)	Range	Budget	(dB)
	(microns)	(dBm)	Range	Budget	(dB)
	(microns)	(Peak)	(dBm) (Peak)	(dB)	(ONline to
		(Peak)	(dBm) (Peak)	(dB)	(ONline to
					ONline)

	50/125	-16.5 ± 3.0	-8.0 to -29.5	10.0	None
	NA 0.20

	62.5/125	-12.0 ± 3.0	-8.0 to -29.5	14.5	None
	NA 0.275

	85/125	-9.0 ± 3.0	-8.0 to -29.5	17.5	>2.0 dB
	NA 0.29

	100/140	-6.5 ± 3.0	-8.0 to -29.5	20.0	>4.5 dB
	NA 0.29

Attenuation

It is possible for receivers to receive too much light when:

❑Using 85/125 and 100/140 micron fiber cables

❑Ports are close together on a link

2 - 8 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 Document Conventions Text 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 Equivalence LAN Product Equivalent DistancesLAN 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 Fault-Tolerant Configurations Configuring Ports for Fault ToleranceStandard 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 Quick Installation ProceduresStep Procedure Section Title Setting the Dip Switches Setting Dip Switch SW1 BASE-FL Module Dip Switch LocationsDip Switch SW1 Settings Factory Switch SettingFunction Off Default Setting Dip Switch SW2 Dip Switch SW2 Settings for Switches 1 toSwitch 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 IndicatesLED State Module Is Configured for Verifying the LED and Network AssignmentsNetwork 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 SpecificationsOptical Specifications Transmitter SpecificationsTable A-2. Transmit Power Peak Values Receiver Specifications Table A-3. 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 SupportSupport from Your Network Supplier Email Technical SupportWorld 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