3Com 5108M-TP manual Twisted Pair Cables, Figure A-1. RJ45 Connector Pin-outs

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Refer to Figure A-1 for an example of this connector and the cable pin-outs.

Pair 2

Pair 3

Pair 1

Pair4

1 2 3 4 5 6 7 8

W-G G W-O BL W-BL O W-BR BR

Jack Positions

Figure A-1. RJ45 Connector Pin-outs

Some installations may have 50-pin Telco connectors at the wiring closet. We recommend using a patch panel that converts from 50-pin to RJ45-type connectors. This allows direct connection to the ONline Ethernet 10BASE-T Module in your ONline System Concentrator.

Twisted Pair Cables

The cables that are supported must meet the following qualifications:

❑22, 24, or 26 gauge twisted pair cable

❑80 to 150 ohm impedance

❑minimum of 2 pairs

Usually, a pair on a twisted pair cable is designated by a solid color wire twisted with a striped wire with the same color.

A - 4 ONline Ethernet 10BASE-T Module User’s Guide

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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 How to Use This Guide AudienceStructure of This Guide Usr/snm/agents Document ConventionsConvention Indicates Example Related Documents 3Com Documents Reference DocumentsPage Introduction ONline Ethernet 10BASE-T ModuleIndicators 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 SW3 Crossover Mode, Channel Select, Squelch Dip Switch SW1 Settings and InterpretationsDip Switch SW3 Settings for Switches 1 Switch Function Factory Switch Setting Default OffCrossover Mode Switch Squelch Mode SwitchChannel Select Switch Settings Dip Switch SW3 Settings and Interpretations for Switches 2 Switch Channel SelectionEnable Related FeaturesDip Switch SW6 Settings and Interpretations LED State Channel Configuration Channel Check CodesPage Designing and ExpandingtheNetwork Understanding the General Rules Basic Network RulesSeven Basic Network Rules Rule Definition Recommendations/NotesCertain 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 Twisted Pair Backbone, Twisted Pair To-The-Desk Unshielded Twisted Pair NetworkRedundant Twisted Pair Configuration Redundant LinksPage Patch Panels Installing and Operating the Module Precautionary ProceduresUnpacking Procedures Installation ProceduresInstalling a 10BASE-T Module BASE-T Module Cable Connection Troubleshooting TroubleshootingTroubleshooting With the Status LEDs Troubleshooting With the Port Status LEDsTroubleshooting With the Port Status LEDs Troubleshooting With the Port Status LEDs Troubleshooting With the Activity LEDs Troubleshooting With the Port Activity LEDsPossible Problem Troubleshooting State Solutions LED NameTechnical Assistance ONline Ethernet 10BASE-T Module Specifications Electrical SpecificationsGeneral Specifications Environmental SpecificationsMechanical Specifications Twisted Pair Connectors and Cables Twisted Pair ConnectorsFigure A-1. RJ45 Connector Pin-outs Twisted Pair CablesConnecting Twisted Pair Cables Page Technical Support On-line Technical SupportWorld Wide Web Site Support from Your Network SupplierEmail Technical Support Support from 3Com Accessing the 3Com MIB Returning Products for Repair3Com Technical Publications Page Index MIB, B-4