3Com 5108M-TP manual Troubleshooting

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4 Troubleshooting

This chapter describes troubleshooting procedures for the ONline Ethernet 10BASE-T Module. Information on troubleshooting will assist you in verifying operation. Typical fault conditions are addressed in this chapter.

Troubleshooting

Diagnostic features are covered in Table 1-1 on page 1-4. Table 4-1 and Table 4-2 in this chapter cover fault conditions and troubleshooting suggestions for the 10BASE-T Module. This chapter is divided into the following parts:

❑Troubleshooting With the Port Status LEDs

❑Troubleshooting With the Activity LEDs

❑Technical Assistance

Troubleshooting 4 - 1

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Contents ONline Ethernet 10BASE-T Module User’s Guide Ii ONline Ethernet 10BASE-T Module User’s Guide ONline Ethernet 10BASE-T Module User’s Guide Iv ONline Ethernet 10BASE-T Module User’s Guide Contents Installing and Operating the Module Figures Viii ONline Ethernet 10BASE-T Module User’s Guide Tables Page Audience How to Use This GuideStructure of This Guide Usr/snm/agents Document ConventionsConvention Indicates Example Related Documents Reference Documents 3Com DocumentsPage ONline Ethernet 10BASE-T Module IntroductionIndicators BASE-T Module Faceplate and ONline System Concentrator LED Name Color State Indicates Dip SwitchesInterpretation of the 10BASE-T Module LEDs Dip Switch SW1 Port Status Dip Switch SW1 Settings and Interpretations Dip Switch SW3 Crossover Mode, Channel Select, SquelchSquelch Mode Switch Dip Switch SW3 Settings for Switches 1Switch Function Factory Switch Setting Default Off Crossover Mode SwitchChannel Select Switch Settings Switch Channel Selection Dip Switch SW3 Settings and Interpretations for Switches 2Enable Related FeaturesDip Switch SW6 Settings and Interpretations Channel Check Codes LED State Channel ConfigurationPage Designing and ExpandingtheNetwork Basic Network Rules Understanding the General RulesRule Definition Recommendations/Notes Seven Basic Network RulesCertain LAN devices Seven Basic Network Rules LAN Product Equivalent Distance meters LAN EquivalenceLAN Product Equivalent Distances Fiber Backbone, Twisted Pair To-The-Desk Fiber Backbone, Twisted Pair To-The-Desk Example Sample Configuration Distance Calculation Shielded Twisted Pair High Squelch Low Squelch IBM Type Maximum Link Distance on Twisted PairUnshielded Twisted Pair High Squelch Low Squelch Unshielded Twisted Pair Network Twisted Pair Backbone, Twisted Pair To-The-DeskRedundant Links Redundant Twisted Pair ConfigurationPage Patch Panels Precautionary Procedures Installing and Operating the ModuleInstallation Procedures Unpacking ProceduresInstalling a 10BASE-T Module BASE-T Module Cable Connection Troubleshooting TroubleshootingTroubleshooting With the Port Status LEDs Troubleshooting With the Status LEDsTroubleshooting With the Port Status LEDs Troubleshooting With the Port Status LEDs LED Name Troubleshooting With the Activity LEDsTroubleshooting With the Port Activity LEDs Possible Problem Troubleshooting State SolutionsTechnical Assistance Electrical Specifications ONline Ethernet 10BASE-T Module SpecificationsGeneral Specifications Environmental SpecificationsMechanical Specifications Twisted Pair Connectors Twisted Pair Connectors and CablesTwisted Pair Cables Figure A-1. RJ45 Connector Pin-outsConnecting Twisted Pair Cables Page On-line Technical Support Technical SupportWorld Wide Web Site Support from Your Network SupplierEmail Technical Support Support from 3Com Returning Products for Repair Accessing the 3Com MIB3Com Technical Publications Page Index MIB, B-4