3Com 5108M-TP manual Designing and ExpandingtheNetwork

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2 Designing and ExpandingtheNetwork

This appendix contains configuration information that will help you to design your network. Install all equipment using only approved cables for proper operation. Refer to Appendix A in the Twisted Pair Connectors and Cables section for information on twisted pair connector and cable requirements.

This appendix describes how to configure your network with the ONline System Concentrator and the ONline Ethernet 10BASE-T Module. It also provides examples of alternative network cabling structures and rules for configuring Ethernet networks. There are five sections:

Network Diameter Calculations: General Rules

Fiber Backbone, Twisted Pair To-The-Desk

Twisted Pair Backbone, Twisted Pair To-The-Desk

Redundant Links

Patch Panels

Designing and Expanding the Network 2 - 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, 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 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 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 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