3Com 5104M-FL1 installation and operation guide 10BASE-FB Fiber Backbone, 10BASE-FL to-the-Desk

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Incoming signal from Transceiver A to the 10BASE-T Module = 420 m.

Outgoing signal from the 10BASE-T Module to Transceiver B = 165 m (420 m + 165 m = 585 m).

4.Subtract all cable lengths between the two transceivers (calculate copper length the same way you do for fiber). In this example, the total cable distance equals 1725 meters.

If the result from step 4 is greater than zero, the configuration is within legal Ethernet limits (Rule 5).

The calculation in this example shows that 770 meters remain for expansion in this configuration. Therefore, this configuration is legal.

10BASE-FB Fiber Backbone, 10BASE-FL to-the-Desk

Use the information in this section when designing your network using 10BASE-FB fiber as the network backbone and 10BASE-FL Modules for to-the-desk connectivity. This section assumes that the backbone is comprised of 3Com fiber products, such as the ONline Ethernet Fiber Module or ONline Ethernet 10BASE-FB Module. 3Com Ethernet Fiber modules and transceivers conform to the IEEE 10BASE-F standard.

The rules that apply to building this type of network have been covered in the previous sections. The following two additional rules apply when using ONline Ethernet Fiber Modules:

1.The equivalent fiber distance for the Fiber Module and the Port-Switching Fiber Module is:

140 meters for signals that externally enter the module

50 meters for signals that internally enter the module through the ONline Concentrator backplane

Designing and Expanding the Network 2 - 23

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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 Audience How to Use This GuideStructure of This Guide Document Conventions Text ConventionsText Convention Example 3Com Documents Related DocumentsReference Documents Page Introduction 10BASE-FL Module Description Theory of Operation 10BASE-FL and Foirl Ieee Standards ComparisonBASE-F Standards 10BASE-F Standard DescriptionBASE-FL Module Connections Designing and ExpandingtheNetwork Basic Network Rules Understanding the General RulesSeven Basic Network Rules Rule Definition Recommendations/NotesAs equivalent distance. Every Assume that one LAN Equivalence LAN Product Equivalent DistancesLAN Product Equivalent Calculating Maximum Link Distance Determining Maximum 10BASE-FL Link DistancesDetermining Link Budget Cable Size Transmit Receive Optical Link Loss Power BASE-FL Module Optical Power BudgetDBm ONline toSplicing Connector Type Range of Loss Per Typical Loss dB Pair dB Connector and Splice Insertion LossTypical Fiber Loss Characteristics Splice Type Range of Loss dB Typical Loss dBMeter Fiber Link With Mechanical Splice Example Fiber Link With Mechanical SpliceMeter Fiber Link Through Two Patch Panels Example Fiber Link Through Patch PanelsChoosing a Network Backbone Cabling Structure Star ConfigurationStar-Wiring Configuration Serial ConfigurationSerial Configuration Using 10BASE-FL Modules 10BASE-FL Module Configurations10BASE-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 ConcentratorsNetwork with 6 Concentrators Fiber Equivalent Distances Between Transceivers 10BASE-FL Backbone, Unshielded Twisted Pair to-the-DeskTotal Fiber Number Equivalent PathExample 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 ConfigurationConnecting External Network Devices Ieee 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 Implementing Backbone Cable Plant Fault Tolerance10. Redundant Fiber Backbone Configuration Remote Failure Signaling 11. Total Backbone Fault-Tolerant Configuration Implementing Total Backbone Fault Tolerance12. Network With 3 Concentrators ONline Ethernet 10BASE-FL Installation and Operation Guide Installing and Operating the Module Unpacking Procedures Precautionary ProceduresQuick Installation Quick Installation ProceduresStep Procedure Section Title Setting the Dip Switches BASE-FL Module Dip Switch Locations Setting Dip Switch SW1Dip Switch SW1 Settings Factory Switch SettingFunction Off Default Setting Dip Switch SW2 Dip Switch SW2 Settings for Switches 1 toSwitch Function Factory Default Dip Switch SW2 Settings for Switches 5 Installing the ModuleSwitch Settings Channel SelectionInstalling the 10BASE-FL Module BASE-FL Module Connection Configuring the Module Enabling Ports Enabling Port Redundancy Selecting a NetworkSET Port slot.port Mode Redundant slot.port BASE-FL Modules Connected with Redundancy/RFS Enabled Enabling Remote Failure SignalingSaving Module Configuration Showing Module ConfigurationMonitoring the Front Panel Shows the location of these indicatorsBASE-FL Module Faceplate and ONline System Concentrator LED Name Color State Indicates Interpreting the 10BASE-FL Module LEDsLED State Module Is Configured for Verifying the LED and Network AssignmentsNetwork Check Codes Troubleshooting Troubleshooting Using the Port Activity LEDs Troubleshooting Using the Port Activity LEDsLED Name 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 Technical Assistance RFS TroubleshootingONline Ethernet 10BASE-FL Installation and Operation Guide Specifications Table A-1. General Specifications General SpecificationsOptical Specifications Transmitter SpecificationsTable A-2. Transmit Power Peak Values Receiver 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 SpecificationsFiber Cables and Connectors 10BASE-FL Cable and Connector SpecificationsConnector Type Part Number Table A-8. Connector Type Part NumberOn-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 Index RFS VDE compliance Verify LED Operation, 3-19Network Assignment