3Com 5108M-TP manual Dip Switch SW3 Settings and Interpretations for Switches 2

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10BASE-T Module is initially configured to channel 1. To reconfigure the module to a different channel, refer to the information in Table 1-4.

Table 1-4. Dip Switch SW3 Settings and Interpretations for Switches 2 and 3

 

 

Switch 2

Switch 3

Channel Selection

 

 

 

 

 

Switch Setting

On

On

1 (default)

 

 

 

 

 

 

 

On

Off

2

 

 

 

 

 

 

 

Off

On

3

 

 

 

 

 

 

 

Off

Off

Isolated (module

 

 

 

 

operates independent of

 

 

 

 

any channel)

 

 

 

 

 

If you have an ONline Ethernet Network Management Module installed in your concentrator, you can remotely override these switch settings.

Dip Switch SW6 (Link Integrity)

The eight switches on dip switch SW6 allow you to enable or disable Link Integrity for each port. The switches are labeled 1 through 8 and correspond to the eight ports. The On position enables Link Integrity for each port (default) and the Off position disables Link Integrity for each port. The switch settings are initially configured in the On position, therefore, all eight ports have Link Integrity enabled, as per the 10BASE-T standard.

In general, you should enable Link Integrity. To conform to the 10BASE-T standard, for example, a connection requires Link Integrity to be enabled. You must disable Link Integrity to connect to older equipment which does not conform to the 10BASE-T standard. Link Integrity must either be enabled at both ends of the link or disabled at both ends or the module will report a Link Integrity error.

Introduction 1 - 9

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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