3Com 5108M-TP manual Dip Switch SW3 Crossover Mode, Channel Select, Squelch

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On position, therefore, all ports are initially enabled. Table 1-2 describes the settings and functions for switches 1 through 8.

Table 1-2. Dip Switch SW1 Settings and Interpretations

Switch

Function

Factory

Switch Setting

Default

Off

On

 

 

 

 

 

 

 

1 - 8

Enable/disable port

enable

disable

enable

 

 

 

 

 

If you have an ONline Ethernet Network Management Module installed in your concentrator, you can remotely override these switch settings. Refer to the ONline Ethernet Network Management Module Installation and Operation Guide for information on remotely managing the ports.

Dip Switch SW3 (Crossover Mode, Channel Select, Squelch)

The four switches on dip switch SW3 allow you to:

set port 8 to uncrossed mode

select a channel for the module

set the Squelch level to high (normal) or low (sensitive)

The switches are labeled 1 through 4 and the settings affect all eight ports. Switch 1 allows you to enable or disable crossover mode for port 8. The channel is initially configured for channel 1 (default) and Squelch level is initially configured for high (default). The following sections explain the crossover, channel selection, and Squelch mode.

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

1 - 6 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 Convention Indicates Example Document ConventionsUsr/snm/agents Related Documents 3Com Documents Reference DocumentsPage Introduction ONline Ethernet 10BASE-T ModuleIndicators 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 SW3 Crossover Mode, Channel Select, Squelch Dip Switch SW1 Settings and InterpretationsCrossover Mode Switch Dip Switch SW3 Settings for Switches 1Switch Function Factory Switch Setting Default Off Squelch Mode SwitchChannel Select Switch Settings Dip Switch SW3 Settings and Interpretations for Switches 2 Switch Channel SelectionDip Switch SW6 Settings and Interpretations Related FeaturesEnable 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 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 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 Possible Problem Troubleshooting State Solutions Troubleshooting With the Activity LEDsTroubleshooting With the Port Activity LEDs LED NameTechnical Assistance ONline Ethernet 10BASE-T Module Specifications Electrical SpecificationsMechanical Specifications Environmental SpecificationsGeneral 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 SupportEmail Technical Support Support from Your Network SupplierWorld Wide Web Site Support from 3Com Accessing the 3Com MIB Returning Products for Repair3Com Technical Publications Page Index MIB, B-4