3Com 5101T-FB-SMA, 5101T-FB-FC, 5101T-FB-ST manual Troubleshooting, Status LED

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If after completing Steps 1 and 2 you find blink- ing Status indicators on connected and enabled modules or devices, refer to the Troubleshooting section in this manual.

Troubleshooting

This section explains how to use the diagnostic features of the 10BASE-FB Transceiver for fault isolation. This section describes:

■Status LED

■Troubleshooting Fiber Links

■System Problems

Status LED

The 10BASE-FB Transceiver provides a diagnostic status LED that indicates link status. The normal state for this indicator is the steady ON state. If the LED is OFF, this usually indicates lack of power.

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Contents 10BASE-FB Transceiver Installation Guide Page VDE Class B Compliance Copyright Statement Table of Contents EEE Version Page Page Preface Intended AudienceThis guide is divided into five sections Transceiver Overview Transceiver Top PanelTransceiver Top Panel Transceiver DIP Switch Settings Switch Setting DescriptionTransceiver Front Panel Transceiver Front PanelTransceiver Rear Panel Fiber link transmit and receive SQE Test PortsTransceiver Rear Panel Alternate Collision Mode Transceiver LED DescriptionsHigh Power PWR SQE TestInstallation Half Step ModeSite Preparation and Placement Unpacking Procedures Verifying Transceiver Switch Settings Transceiver DIP Switch Default 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 Verifying Physical Link Operation To verify physical link operationTroubleshooting Status LEDPage Troubleshooting Using the Status LEDs LEDTroubleshooting Using the Status LEDs Troubleshooting Using the Status LEDs Troubleshooting Link Problems Troubleshooting System Problems Excessive CollisionsLate Collisions and Failure to Defer Miscellaneous Errors Signal Differences Transceiver CablesEEE VersionWire Sizes Transceiver Cable Wire Sizes Cable Type Signal Pair Power PairAUI Cable Pinout Chart Cable PinoutsCO-A Troubleshooting Transceiver Cables Symptoms of Faulty Transceiver CablesCauses of Fault Transceiver Cables Specifications Cable RecommendationsGeneral Specifications General SpecificationsOptical Interface Specifications Optical Interface SpecificationsFiber Optic Cable Specifications Transmit Power SpecificationsTransmit Power Fiber Optic Cables CompatibilityAttachment Unit Interface Specifications AUI Specifications