3Com 5102M-FBP, 5104M-FB1 ONline 10BASE-FB Module Optical Power Budget High Power, ONline to

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Table 2-5 provides information on the 10BASE-FB-specific optical power budget.

Table 2-4. ONline 10BASE-FB Module Optical Power Budget: High Power

					Link Loss	Link Loss
	Cable				Link Loss	Required
	Cable	Transmit	Receive	Optical	Required	Required
	Size	Transmit	Receive	Optical	Required	(dB)
	Size	Power	Power	Power	(dB)	(dB)
	Used	Power	Power	Power	(dB)	(ONline to
	Used	(dBm)	(dBm)	Budget	(ONline to	(ONline to
	(micron)	(dBm)	(dBm)	Budget	(ONline to	10BASE-F
	(micron)			(dB)	ONline)	10BASE-F
				(dB)	ONline)	B)
						B)

	50/125	-14.25 ±	-8.0 to	13.5	None	>2.0
	NA 0.20	2.25	-30.0

	62.5/125	-10.0 ±	-8.0 to	17.75	>0.25	>6.25
	NA	2.25	-30.0
	0.275

	85/125	-7.0 ±	-8.0 to	20.75	>3.25	>9.25
	NA 0.29	2.25	-30.0

	100/140	-4.5 ±	-8.0 to	23.25	>5.75	>11.75
	NA 0.29	2.25	-30.0

Table 2-5. 10BASE-FB Optical Power Budget

	Cable Size Used	Transmit	Receive	Optical
	Cable Size Used	Power	Power	Power
	(micron)	Power	Power	Power
	(micron)	(dBm)	(dBm)	Budget (dB)
		(dBm)	(dBm)	Budget (dB)

	50/125 (NA 0.20)	-20.0 ± 1.0	-14.0 to 29.0	8.0

	62.5/125(NA 0.275)	-15.1 ± 1.0	-14.0 to 29.0	12.9

	85/125 (NA 0.29)	-13.1 ± 1.0	-14.0 to 29.0	14.9

	100/140 (NA 0.29)	-11.6 ± 1.0	-14.0 to 29.0	16.4

Designing and Expanding the Network 2 - 9

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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 Audience How to Use This GuideStructure of This Guide Document Conventions Convention Indicates ExampleUsr/snm/agents 3Com Documents Related DocumentsReference Documents Slot ONline System Concentrator Installation and OperationPage Introduction 10BASE-FB Module Descriptions Introduction 1 Theory of Operation 10BASE-FB ComplianceBASE-FB Module Connections Compatibility With Other Ethernet Fiber Products BASE-FB Module Compatibility3Com Product Part Number Designing and Expanding the Network Understanding the General Rules Rules for Configuring a NetworkBasic Network Rules Rule Definition Recommendations/NotesDefinition Recommendations/Notes Is actually equal to 1.1 meters Equivalent Fiber Distances Equivalent Fiber Distances of LAN ProductsLAN Product Equivalent Fiber Determining Maximum Fiber Link Distances Determining Link Budget Calculating Maximum Link DistancePower ONline 10BASE-FB Module Optical Power Budget Normal PowerLink Link Loss DBmBASE-FB Optical Power Budget ONline 10BASE-FB Module Optical Power Budget High PowerCable Size Used Transmit Receive Optical Power Micron ONline toAttenuation Typical Fiber Loss Characteristics Connector and Splice Insertion LossMeter Fiber Link With Mechanical Splice Example 1700 Meter Fiber Link With Mechanical SpliceMeter Fiber Link Through Two Patch Panels Example 2000 Meter Fiber Link Through Two Patch PanelsChoosing a Network Backbone Cabling Structure Star-Wiring Configuration Star ConfigurationSerial Configuration Using 10BASE-FB Modules Serial ConfigurationFiber Backbone, Fiber-to-the-Desk 10BASE-FB Module ConfigurationsAll-Fiber Network Network With 3 Concentrators Example Network With 3 ConcentratorsExample Network with 8 Concentrators Network Configured With 8 ConcentratorsFiber Equivalent Distances Between Transceivers Fiber Backbone, Unshielded Twisted Pair to-the-Desk Example Sample Configuration Distance CalculationSample Configuration Distance Calculation Fiber Backbone, Coaxial Connection Example Connecting a Thin Ethernet 10BASE2 SegmentDesigning and Expanding the Network 2 Fault-Tolerant Configurations Configuring Ports for Fault ToleranceStandard Redundant Configuration In this configuration 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 Quick Installation Quick Installation ProceduresStep Procedure Section Title Setting the Dip Switches BASE-FB Module Dip Switch Locations Setting Dip Switch S1 Dip Switch S1 Settings for Switches 1Switch Label Function Factory Switch Setting Default Off Port-Switching Module Port Dip Switch S1 Settings for Switches 3 toModule-Switching Module Channel SelectionSetting Dip Switch S2 Dip Switch S2 SettingsSwitch Label Function Factory Switch Setting Default Enable/disable Disable Module Low Light Detection Not Used Installing the ModuleInstalling 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 waysEnabling Low Light Warning Enabling Optical PowerSaving Module Configuration Showing Module ConfigurationMonitoring the Front Panel Page LED Name Color State Indicates Interpreting the 10BASE-FB Module LEDsLED State Network Configuration Verifying LED and Network AssignmentsNetwork Check Codes Troubleshooting Troubleshooting Using the Port Activity LEDs Troubleshooting Using the Port Activity LEDsPossible Cause Corrective Action Troubleshooting Using the Port Status LEDs Troubleshooting Using the Port Status LEDsLED State Indication Possible Cause Corrective Action Troubleshooting Using the Port Status LEDs Troubleshooting Using the Port Status LEDs 10BASE-FL Technical Assistance Page Specifications Table A-1. General Specifications General SpecificationsTransmitter Specifications Optical SpecificationsTable A-2. Transmit Power Cable Type Normal Power High PowerReceiver Specifications Table A-3. Receiver SpecificationsSupported Fiber Optic Cables Table A-4. Fiber Optic Interface Specifications Power RequirementsTable A-5. Power Requirements Fiber Optic InterfaceMechanical Specifications Environmental SpecificationsTable A-6. Electrical Specifications Table A-7. Mechanical Specifications10BASE-FB Cables 10BASE-FB Cable and Connector Specifications10BASE-FB Connectors Port-Switching Connector TypeTable A-8 BASE-FB Module Part Numbers On-line Technical Support Technical SupportSupport from Your Network Supplier Email Technical SupportWorld Wide Web Site Support from 3Com Returning Products for Repair Accessing the 3Com MIB3Com Technical Publications Page Index Installing Link Budget Redundant Link, 3-16Redundancy LED Unpacking Procedures, 3-3Unshielded Twisted Pair Cable