3Com 5101T-FB-ST, 5101T-FB-SMA, 5101T-FB-FC manual Troubleshooting Link Problems

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Table 6. Troubleshooting Using the Status LEDs

LED

Indicates

Possible

Possible

Status

Problem

Solution

 

 

 

 

 

 

 

5

Invalid

Broken or

Check and fix

Blinks

data

degraded

RX fiber link

(con’t)

 

 

fiber

 

 

 

 

 

 

 

 

 

Bad or

Try another

 

 

 

degraded

port or

 

 

 

port on other

replace unit

 

 

 

end

 

 

 

 

 

 

Troubleshooting Link Problems

Each full duplex fiber link is monitored at both ends. The 10BASE-FB Star Coupler and the 3Com Ethernet 10BASE-FB Modules contain status indicators (one for each port). The Transceiver contains a single status indicator. In addition to signifying link problems, the Transceiver indicator also indicates a local or remote jabber condition.

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Contents 10BASE-FB Transceiver Installation Guide Page VDE Class B Compliance Copyright Statement Table of Contents EEE Version Page Page Intended Audience PrefaceThis guide is divided into five sections Transceiver Top Panel Transceiver OverviewTransceiver Top Panel Switch Setting Description Transceiver DIP Switch SettingsTransceiver Front Panel Transceiver Front PanelFiber link transmit and receive SQE Test Ports Transceiver Rear PanelTransceiver Rear Panel Transceiver LED Descriptions Alternate Collision ModeSQE Test High Power PWRHalf Step Mode InstallationSite Preparation and Placement Unpacking Procedures Transceiver DIP Switch Default Settings Verifying Transceiver Switch SettingsPage Page Connecting to Ethernet V2.0 and Ieee 802.3 Controllers Connecting to Ethernet V2.0 and Ieee 802.3 Repeaters Connecting Fiber Cables Connecting the AUI Cable To verify physical link operation Verifying Physical Link OperationStatus LED TroubleshootingPage LED Troubleshooting Using the Status LEDsTroubleshooting Using the Status LEDs Troubleshooting Using the Status LEDs Troubleshooting Link Problems Excessive Collisions Troubleshooting System ProblemsLate Collisions and Failure to Defer Miscellaneous Errors Transceiver Cables Signal DifferencesVersion EEEWire Sizes Cable Type Signal Pair Power Pair Transceiver Cable Wire SizesCable Pinouts AUI Cable Pinout ChartCO-A Symptoms of Faulty Transceiver Cables Troubleshooting Transceiver CablesCauses of Fault Transceiver Cables Cable Recommendations SpecificationsGeneral Specifications General SpecificationsOptical Interface Specifications Optical Interface SpecificationsFiber Optic Cables Compatibility Transmit Power SpecificationsTransmit Power Fiber Optic Cable SpecificationsAUI Specifications Attachment Unit Interface Specifications