3Com 5124M-TPCL manual Technical Assistance, Troubleshooting Using the Port Activity LEDs

Page 80

Troubleshooting Using the Port Activity LEDs

Under some conditions a Port Activity LED may not light. Use the troubleshooting suggestions in Table 4-2 to help determine why this has occurred and to isolate the source of the problem.

Table 4-2. Troubleshooting Using the Port Activity LEDs

LED State	Possible Cause	Corrective Action

Off	There is no traffic	None.
	received from the
	segments (normal).

	Hub power is off.	Check the Controller
		Module Power LEDs.

	The Activity LED has	Press the LED test button
	burned out.	on the Controller Module.

	A 24-Port Module port	Connect the cable to a
	is faulty.	different port.

	The module	Re-insert the 24-Port
	connection to the	Module. If this fails to
	backplane is bad.	correct the problem, try
		another concentrator slot.

	The 24-Port Module is	Try a different 24-Port
	faulty.	Module.

Technical Assistance

Refer to Appendix B for instructions on contacting Technical Support for your product.

4 - 4 ONline Ethernet 24-Port 10BASE-T Module Installation Guide

Image 80

Contents ONline Ethernet 24-Port 10BASE-T Module Installation Guide VDE Class B Compliance Restricted Rights Page Contents Installing and Operating the Module Troubleshooting Page Figures ONline Ethernet 24-Port 10BASE-T Module Installation Guide Tables Page How to Use This Guide AudienceStructure of This Guide Usr/snm/agents Document ConventionsConvention Indicates Example Related Documents 3Com Documents Reference DocumentsPage Introduction Ethernet 24-Port 10BASE-T Module DescriptionModule Features Model Number 5124M-TPCL Features Bank Switching CapabilityModel Number 5124M-TP Features Theory of OperationTypical 24-Port Module Configuration Page Designing and Expanding the Network Rules for Configuring a Network Understanding the General RulesSeven Basic Network Rules Rule Definition Recommendations/NotesCertain LAN devices Seven Basic Network Rules LAN Product Equivalent Distance meters LAN EquivalenceLAN Product Equivalent Distances Choosing a Network Backbone Cabling Structure LAN Product EquivalentBuilding a Network Star Configuration Star-Wiring ConfigurationBuilding a Network Serial Configuration Serial ConfigurationPort Module Configurations Fiber Backbone, 10BASE-T To-The-DeskExample Sample Configuration Distance Calculation 10BASE-T Backbone, 10BASE-T To-The-Desk Unshielded Twisted Pair Network Using 24-Port Modules Using Patch Panels Establishing Fault-Tolerant ConfigurationsSetting Port Redundancy Setting Backbone RedundancyRedundant Twisted Pair Backbone Designing and Expanding the Network 2 Page Installing and Operating the Module Precautionary Procedures Quick InstallationProcedures for Completing Installation Step Procedure Section TitleEstablish connections from the 24-Port Unpacking Procedures Setting the DIP SwitchesDIP Switch Overview Model 5124M-TPCL and Model 5124M-TP DIP Switch Location DIP Switch Description Default DIP Switch SettingsLabel Function Factory DIP Switch Setting Network Selection Channel Network Select DIP Switch SettingsDIP Switch Setting Conn Installing the Module Installing a 24-Port Module Model Number 5124M-TPCL Port Module Cable Connection Model Number 5124M-TPCL Using 90 Cable Connectors Installing the Cable Tie-Wrap KitAttaching the Tie-Wrap Bracket to the Module Securing 90 Cables to the Module Attaching Cables With 90 Connectors Configuration in a Managed Environment If Management is Not Available Enabling Port Redundancy Before Configuring the ModuleEnabling Ports Enabling Link Integrity Selecting a NetworkEnabling Remote Diagnostics Mode Setting the Autopartition Threshold Value Saving Module Configurations Showing Module ConfigurationsShow Module Show Port Telco Gathering Network Statistics Selecting the Per-Port Counters Connector Monitoring the Front Panel Shows the location of the LEDs on Model Number 5124M-TPCLShows the location of the LEDs on Model Number 5124M-TP Port Module LED Interpretations LED Name Color State IndicatesUsing the LED Check Button Verifying LED and Network AssignmentsLED State Network Configuration Network Check CodesPage Troubleshooting LED State Indication Possible Cause Corrective Action Troubleshooting Using the Port Status LEDsTroubleshooting Using the Port Status LEDs Troubleshooting Using the Port Status LEDs Troubleshooting Using the Port Activity LEDs Troubleshooting Using the Port Activity LEDsTechnical Assistance LED State Possible Cause Corrective ActionSpecifications General Specifications Table A-1 -Port Module General SpecificationsSpecification Value Model Number 5124M-TPPower Specifications Values Power SpecificationsTable A-2 -Port Module Power Specifications Environmental Specifications Table A-3 -Port Module Fuse SpecificationsFuse Specifications for 24-Port Module Table A-4 -Port Module Environmental SpecificationsMechanical Specifications Twisted Pair Cable and Connector SpecificationsTable A-5 -Port Module Mechanical Specifications Mechanical 5124M-TPCL Values 5124M-TP Values SpecificationsTwisted Pair Cable Specifications Table A-6. IBM Twisted Pair Cable SpecificationsIBM Type No. Shielding Nominal Pairs ImpedanceTwisted Pair Connector Specifications RJ-45 Connector PinoutsPin Connector Pinouts Figure A-1 -Port Module RJ-45 Connector PinoutsFigure A-2 -Pin Male and Female Connectors Table A-7 -Pin Cable Pinouts and Port Assignments Port TX, + RX, + Not Used Connecting Twisted Pair Cables 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 Activity LEDs, 3-29,3-31 VDE compliance