3Com 5108M-TP manual Support from 3Com

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When you contact your network supplier for assistance, have the following information ready:

❑Diagnostic error messages

❑A list of system hardware and software, including revision levels

❑Details about recent configuration changes, if applicable

If you are unable to contact your network supplier, see the following section on how to contact 3Com.

Support from 3Com

If you are unable to receive support from your network supplier, technical support contracts are available from 3Com.

For direct access to customer service for Integrated Systems Division products in:

❑U.S.A. and Canada - call (800) 724-2447

❑Asia Pacific - call (508) 787-5151

❑Europe - Refer to the table below. For European countries not listed, call 31 30 60 299 00.

Country	Telephone Number

Belgium	0800 71429
Denmark	800 17309
Finland	0800 113153
France	05 917959
Germany	0130 821502
Ireland	1 800 553117
Italy	1678 79489

Country	Telephone Number

Netherlands	06 0227788
Norway	800 11376
Spain	900 983125
Sweden	020 795482
U.K.	0800 966197
U.S.	800 876-3266

Technical Support B - 3

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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 Convention Indicates Example Document ConventionsUsr/snm/agents Related Documents Reference Documents 3Com DocumentsPage ONline Ethernet 10BASE-T Module IntroductionIndicators BASE-T Module Faceplate and ONline System Concentrator Interpretation of the 10BASE-T Module LEDs Dip SwitchesLED Name Color State Indicates Dip Switch SW1 Port Status Dip Switch SW1 Settings and Interpretations Dip Switch SW3 Crossover Mode, Channel Select, SquelchSwitch Function Factory Switch Setting Default Off Dip Switch SW3 Settings for Switches 1Crossover Mode Switch Squelch Mode SwitchChannel Select Switch Settings Switch Channel Selection Dip Switch SW3 Settings and Interpretations for Switches 2Dip Switch SW6 Settings and Interpretations Related FeaturesEnable 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 Distances LAN EquivalenceLAN Product Equivalent Distance meters Fiber Backbone, Twisted Pair To-The-Desk Fiber Backbone, Twisted Pair To-The-Desk Example Sample Configuration Distance Calculation Unshielded Twisted Pair High Squelch Low Squelch Maximum Link Distance on Twisted PairShielded Twisted Pair High Squelch Low Squelch IBM Type 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 Troubleshooting With the Port Activity LEDs Troubleshooting With the Activity LEDsPossible Problem Troubleshooting State Solutions LED NameTechnical Assistance Electrical Specifications ONline Ethernet 10BASE-T Module SpecificationsMechanical Specifications Environmental SpecificationsGeneral 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 SupportEmail Technical Support Support from Your Network SupplierWorld Wide Web Site Support from 3Com Returning Products for Repair Accessing the 3Com MIB3Com Technical Publications Page Index MIB, B-4