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3Com 5108M-TP Related Features, LED and Channel Verification, Switch, Function, Factory, Default

Models: 5108M-TP

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If you enable a port and disable Link Integrity, the Status LED is on for 10 seconds and blinks off for 400 msecs to indicate that Link Integrity is disabled.

Table 1-5 lists the settings and functions for switches 1 through 8.

Table 1-5. Dip Switch SW6 Settings and Interpretations

	Switch	Function	Factory	Switch Setting
	Switch	Function	Default	Off	On
			Default	Off	On

	1 - 8	Enable/disable link integrity	enable	disable	enable

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

Related Features

The following sections describe functions which allow you to:

❑check the module's channel assignment and LED functionality

❑remotely manage the 10BASE-T Module

LED and Channel Verification

The ONline Controller Module is equipped with an LED/Channel Check button on the front panel. The LED/Channel Check button has two functions: it causes all LEDs in all modules in the concentrator to light and it causes each module to identify the channel to which it is assigned. When you activate this button, it causes all module LEDs to light for approximately five seconds. Any LED that does not light is defective.

After the five seconds elapse, the diagnostic continues with a channel check of all modules. This channel check causes each module's Status LEDs to blink a number of times corresponding to the channel to which it is

1 - 10 ONline Ethernet 10BASE-T Module User’s Guide

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3Com 5108M-TP manual Related Features, LED and Channel Verification, Function, Factory, Switch Setting, Default, enable

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 VDE Class B Compliance Federal Communications Commission NoticeCanadian Emissions Requirements EN55022/CISPR22 ComplianceONline Ethernet 10BASE-T Module User’s Guide Restricted Rightsiv ONline Ethernet 10BASE-T Module User’s Guide Chapter 1 - Introduction ContentsHow to Use This Guide Chapter 2 - Designing and Expanding the NetworkAppendix A - Specifications Chapter 3 - Installing and Operating the ModuleChapter 4 - Troubleshooting Appendix B - Technical SupportFigures viii ONline Ethernet 10BASE-T Module User’s Guide Tables Page How to Use This Guide AudienceStructure of This Guide Indicates Document ConventionsConvention ExampleA Warning. A Related DocumentsA Caution. 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 1Color Dip SwitchesLED Name StateDip Switch SW1 Port Status Figure 1-2. 10BASE-T Module and Dip Switch LocationsSwitch Setting Dip Switch SW3 Crossover Mode, Channel Select, SquelchSwitch DefaultSwitch Crossover Mode SwitchSquelch Mode Switch Switch SettingChannel Select Switch Settings 1 - 8 ONline Ethernet 10BASE-T Module User’s GuideSwitch Dip Switch SW6 Link IntegrityChannel Selection SwitchSwitch Related FeaturesLED and Channel Verification Switch SettingLED State Channel ConfigurationThe ONline Ethernet Network Management Module 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 RulesRecommendations/Notes RuleDefinition Table 2-1. Seven Basic Network RulesDefinition Table 2-1. Seven Basic Network Rules ContinuedRule Recommendations/NotesRecommendations/Notes RuleDefinition The fiber link distancesEquivalent LAN EquivalenceLAN Product Distance metersLAN Product Fiber Backbone, Twisted Pair To-The-DeskTable 2-2. LAN Product Equivalent Distances Continued EquivalentFiber Backbone, Twisted Pair To-The-Desk Example Figure 2-1. Sample Configuration Distance Calculation 22 .6mm Cable GaugeSupports Link Distances Up To 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 TroubleshootingProblem Troubleshooting With the Status LEDsTroubleshooting IndicationLED State TroubleshootingProblem IndicationLED State TroubleshootingProblem IndicationSolutions Troubleshooting With the Activity LEDsPossible Problem 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