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

Models: 5108M-TP

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Figure A-1. RJ45 Connector Pin-outs

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

Contents

118 Turnpike Road Southborough, MA U.S.A 508 FAX 508 ONline Ethernet 10BASE-T Module User’s GuideDocument Number Printed March Model Number 5108M-TP 3Com Corporation Federal Communications Commission Notice Canadian Emissions RequirementsVDE Class B Compliance EN55022/CISPR22 ComplianceONline Ethernet 10BASE-T Module User’s Guide Restricted Rightsiv ONline Ethernet 10BASE-T Module User’s Guide Contents How to Use This GuideChapter 1 - Introduction Chapter 2 - Designing and Expanding the NetworkChapter 3 - Installing and Operating the Module Chapter 4 - TroubleshootingAppendix A - Specifications Appendix B - Technical SupportFigures viii ONline Ethernet 10BASE-T Module User’s Guide Tables Page How to Use This Guide AudienceStructure of This Guide Document Conventions ConventionIndicates ExampleRelated Documents A Caution. AA Warning. A Warning Wear eye3Com Documents Reference DocumentsPage 1 Introduction The ONline Ethernet 10BASE-T ModuleIndicators Figure 1-1. 10BASE-T Module Faceplate and ONline System Concentrator Introduction 1Dip Switches LED NameColor StateDip Switch SW1 Port Status Figure 1-2. 10BASE-T Module and Dip Switch LocationsDip Switch SW3 Crossover Mode, Channel Select, Squelch SwitchSwitch Setting DefaultCrossover Mode Switch Squelch Mode SwitchSwitch Switch SettingChannel Select Switch Settings 1 - 8 ONline Ethernet 10BASE-T Module User’s GuideDip Switch SW6 Link Integrity Channel SelectionSwitch SwitchRelated Features LED and Channel VerificationSwitch Switch SettingChannel Configuration The ONline Ethernet Network Management ModuleLED State Table 1-6. Channel Check Codes1 - 12 ONline Ethernet 10BASE-T Module User’s Guide 2 Designing and ExpandingtheNetwork Designing and Expanding the Network 2Understanding the General Rules Basic Network RulesRule DefinitionRecommendations/Notes Table 2-1. Seven Basic Network RulesTable 2-1. Seven Basic Network Rules Continued RuleDefinition Recommendations/NotesRule DefinitionRecommendations/Notes The fiber link distancesLAN Equivalence LAN ProductEquivalent Distance metersFiber Backbone, Twisted Pair To-The-Desk Table 2-2. LAN Product Equivalent Distances ContinuedLAN Product EquivalentFiber Backbone, Twisted Pair To-The-Desk Example Figure 2-1. Sample Configuration Distance Calculation Cable Gauge Supports Link Distances Up To22 .6mm 150mTwisted Pair Backbone, Twisted Pair To-The-Desk Figure 2-2. Unshielded Twisted Pair NetworkRedundant Links Figure 2-3. Redundant Twisted Pair ConfigurationTo set redundancy between two 10BASE-T Modules, connect two links between the modules. The redundant link must be connected to a port on the same 10BASE-T Module as the primary link. Use a crossover adapter between each link unless you choose to uncross port 8 on one of the modules to make the connection. Refer to Chapter 1 for information on using crossover mode. Then use the SET PORT slot.port MODE REDUNDANT slot.port command to specify which port is the primary link and which is the backup link Patch Panels 2 - 14 ONline Ethernet 10BASE-T Module User’s Guide3 Installing and Operating the Module Precautionary ProceduresUnpacking Procedures Installation ProceduresFigure 3-1. Installing a 10BASE-T Module Figure 3-2. 10BASE-T Module Cable Connection 4 Troubleshooting TroubleshootingTroubleshooting With the Status LEDs TroubleshootingProblem IndicationTroubleshooting ProblemLED State IndicationTroubleshooting ProblemLED State IndicationTroubleshooting With the Activity LEDs Possible ProblemSolutions TroubleshootingTechnical Assistance Electrical Specifications A SpecificationsONline Ethernet 10BASE-T Module Specifications General Specifications Environmental SpecificationsMechanical Specifications Twisted Pair Connectors and Cables Twisted Pair ConnectorsTwisted Pair Cables Figure A-1. RJ45 Connector Pin-outsConnecting Twisted Pair Cables Page B 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 Numerics