3Com 5101T-FB-SMA, 5101T-FB-FC, 5101T-FB-ST Troubleshooting System Problems, Excessive Collisions

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All link problems cause the link to be inoperable. If a link problem is indicated, check the indicators at both sides of the link, and then consult Table 6.

Troubleshooting System Problems

This section addresses some of the system problems that can be corrected using the options on the 10BASE-FB Transceiver. If problems occur, always check the diagnostics indicators on the Transceiver.

Excessive Collisions

Collisions can be caused by loops in the 10BASE-FB network. Such loops cause every packet to collide with itself. If you cannot locate the loop, try segmenting your network (by dis- connecting Star Couplers, or ONline and ONcore Hubs one at a time) until the loop is located.

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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 SpecificationsTransmit Power Specifications Transmit PowerFiber Optic Cable Specifications Fiber Optic Cables CompatibilityAttachment Unit Interface Specifications AUI Specifications