3Com 5108M-TP manual Troubleshooting With the Port Status LEDs

Page 49

Table 4-1. Troubleshooting With the Port Status LEDs (Continued)

LED State

Indication

Possible

Troubleshooting

Problem

Suggestions

 

 

 

 

 

 

 

 

1 Blink

Link

Cable not

Connect cable.

 

Integrity

connected

 

 

Error

 

 

 

 

 

Cable broken

Check cable with cable

 

 

 

 

 

 

 

tester. Repair or replace

 

 

 

 

cable.

 

 

 

 

 

 

 

 

Cable too long

Try a shorter cable.

 

 

 

 

 

 

 

 

Remote

Enable Link Integrity at

 

 

 

connection has

remote connection or if

 

 

 

Link Integrity

the remote link does not

 

 

 

disabled

have Link Integrity,

 

 

 

 

disable Link Integrity at

 

 

 

 

local connection.

 

 

 

 

 

 

 

 

Weak or no

Change Squelch level

 

 

 

signal - link

from high to low (low

 

 

 

distance too

setting does not

 

 

 

long

conform to the

 

 

 

 

10BASE-T standard).

 

 

 

 

 

 

 

 

Bad port

Try another port.

 

 

 

 

 

 

 

 

Device attached

This is not a problem.

 

 

 

to transceiver at

 

 

 

 

other end is not

 

 

 

 

powered on

 

 

 

 

 

 

Troubleshooting 4 - 3

Image 49
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