All-10BASE-FL Network with 3 Concentrators | 3Com 5104M-FL1 guide

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

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 Guide Structure of This Guide Document Conventions Text ConventionsText Convention Example 3Com Documents Related Documents Reference Documents Page Introduction 10BASE-FL Module Description 10BASE-F Standard Description 10BASE-FL and Foirl Ieee Standards ComparisonTheory of Operation BASE-F Standards BASE-FL Module Connections Designing and ExpandingtheNetwork Rule Definition Recommendations/Notes Understanding the General RulesBasic Network Rules Seven Basic Network Rules As equivalent distance. Every Assume that one LAN Equivalence LAN Product Equivalent DistancesLAN Product Equivalent Calculating Maximum Link Distance Determining Maximum 10BASE-FL Link Distances Determining Link Budget ONline to BASE-FL Module Optical Power BudgetCable Size Transmit Receive Optical Link Loss Power DBm Splicing 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 Characteristics Meter Fiber Link With Mechanical Splice Example Fiber Link With Mechanical Splice Meter Fiber Link Through Two Patch Panels Example Fiber Link Through Patch Panels Choosing a Network Backbone Cabling Structure Star Configuration Star-Wiring Configuration Serial Configuration Serial Configuration Using 10BASE-FL Modules 10BASE-FL Module Configurations 10BASE-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 Concentrators Network with 6 Concentrators Path 10BASE-FL Backbone, Unshielded Twisted Pair to-the-DeskFiber Equivalent Distances Between Transceivers Total Fiber Number Equivalent Example 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 Configuration Connecting External Network Devices Ieee Example Connecting a Thin Ethernet 10BASE2 Segment Designing 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 Tolerance 10. Redundant Fiber Backbone Configuration Remote Failure Signaling 11. Total Backbone Fault-Tolerant Configuration Implementing Total Backbone Fault Tolerance 12. Network With 3 Concentrators ONline Ethernet 10BASE-FL Installation and Operation Guide Installing and Operating the Module Unpacking Procedures Precautionary Procedures Quick Installation Quick Installation ProceduresStep Procedure Section Title Setting the Dip Switches BASE-FL Module Dip Switch Locations Setting Dip Switch SW1 Dip 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 Settings Installing the 10BASE-FL Module BASE-FL Module Connection Configuring the Module Enabling Ports Enabling Port Redundancy Selecting a Network SET Port slot.port Mode Redundant slot.port BASE-FL Modules Connected with Redundancy/RFS Enabled Enabling Remote Failure Signaling Saving Module Configuration Showing Module Configuration Monitoring the Front Panel Shows the location of these indicators BASE-FL Module Faceplate and ONline System Concentrator LED Name Color State Indicates Interpreting the 10BASE-FL Module LEDs LED 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 Name Troubleshooting Using the Port Status LEDs Troubleshooting Using the Port Status LEDsLED State Indication Possible Cause Corrective Action Replace remote device Technical Assistance RFS Troubleshooting ONline Ethernet 10BASE-FL Installation and Operation Guide Specifications Table A-1. General Specifications General Specifications Optical 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 Requirements Table A-7. Mechanical Specifications Environmental SpecificationsMechanical Specifications Table A-6. Electrical Specifications Fiber Cables and Connectors 10BASE-FL Cable and Connector Specifications Connector Type Part Number Table A-8. Connector Type Part Number On-line Technical Support Technical Support Support from Your Network Supplier Email Technical SupportWorld Wide Web Site Support from 3Com Returning Products for Repair Accessing the 3Com MIB 3Com Technical Publications Page Index Index RFS VDE compliance Verify LED Operation, 3-19Network Assignment