3Com 5104M-FL1 installation and operation guide All-10BASE-FL Network with 3 Concentrators

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4.Each 10BASE-FL Module counts as one half of a repeater. The 802.3 specification limits the number of repeaters between any two network stations to 4. This restricts the number of serially-connected 10BASE-FL Modules to a maximum of 8.

Note: The Ethernet 4-repeater rule limits the number of repeaters between any two transceivers to 4. In general, this restricts most vendor configurations to a maximum of 4 concentrators connected in series.

5.Rule number 1 does not include AUI cables of up to 50 meters. Thus, the total network diameter between 10BASE-FL Ethernet nodes can be 3740 meters (4200 m - 560 m + 50 m + 50 m = 3740 m) through a single concentrator.

Figure 2-5 shows an example of an all-10BASE-FL network

.

Concentrator A

500m

?

Concentrator C

Concentrator B

500 m			1 km

	A			B

Transceiver			Transceiver

Figure 2-5. All-10BASE-FL Network with 3 Concentrators

Designing and Expanding the Network 2 - 17

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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 10BASE-F Standard Description 10BASE-FL and Foirl Ieee Standards ComparisonTheory of Operation BASE-F StandardsBASE-FL Module Connections Designing and ExpandingtheNetwork Rule Definition Recommendations/Notes Understanding the General RulesBasic Network Rules Seven Basic Network RulesAs 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 ONline to BASE-FL Module Optical Power BudgetCable Size Transmit Receive Optical Link Loss Power DBmSplicing 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 CharacteristicsMeter 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 Path 10BASE-FL Backbone, Unshielded Twisted Pair to-the-DeskFiber Equivalent Distances Between Transceivers Total Fiber Number EquivalentExample 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 Channel Selection Installing the ModuleDip Switch SW2 Settings for Switches 5 Switch SettingsInstalling 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 Possible Cause Corrective Action State Troubleshooting Using the Port Activity LEDsTroubleshooting Using the Port Activity LEDs LED NameTroubleshooting 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 Fiber Optic Interface Power RequirementsTable A-4. Fiber Optic Interface Specifications Table A-5. Power RequirementsTable A-7. Mechanical Specifications Environmental SpecificationsMechanical Specifications Table A-6. Electrical 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