Nortel Networks 70 Series manual Chapter Troubleshooting, Using the LED Display

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Chapter 4

Troubleshooting

This chapter provides methods for diagnosing problems with the BayStack 70 Series 10/100 Ethernet Switch.

Using the LED Display

Use the LED display to help you identify the type of problem you have; then check the following:

Verify that the switch is powered on.

Verify that each cable and port connection has the correct pin assignment and no connections are loose.

A good link on a port is verified when the Link/Activity LED is lit for that port.

If the Power LED is not on:

Verify that the power adapter and/or power cord are securely attached to the switch and to the power outlet.

Verify that your AC power source is functioning properly.

If the Link LED is not on:

Verify that the device connected to your switch has a properly funtioning power supply.

Try using a different port on your switch to connect to the device.

Try using a different port on the device connected to your switch.

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Contents Installation and Reference for Copyright 1999 Nortel Networks Iii Statement of Conditions Restricted Rights LegendNortel Networks NA Inc. Software License Agreement 206375-A Contents Chapter Troubleshooting Figures 206375-A Tables Xii Purpose PrefaceHard-Copy Technical Manuals AudienceTechnical Solutions Center Telephone Number How to Get HelpPage Chapter Introduction BayStack 70 Series 10/100 Ethernet Switches OverviewFront Panel Physical DescriptionFront Panel of the BayStack 70-8T 10/100 Ethernet Switch RJ-45 10BASE-T/100BASE-TX Ethernet Ports LEDs Type Label Color Activity Description Description of Switch and Port Status LEDsRear Panel of the BayStack 70-24T 10/100 Ethernet Switch DC Power Adapter Model MAC Addresses in Information Table FeaturesMAC Address Quantities Model Buffer Size Buffer SizesModel External Power Adapter External Power AdaptersPage Benefits of Using Switching Technology Chapter Network ConfigurationTypes of Ethernet Switches Before Desktop SwitchingSegment Switching Before After Extending a Network Bridging 10 Mb/s Networks to 100 Mb/s Networks Bridging from 10BASE-T to 100BASE-TX NetworksPower Workgroup Connections Power WorkgroupsPackage Contents Chapter InstallationOperating Environment Power SpecificationsSet the switch on a desktop or any other flat surface Installing the SwitchAttach any additional devices to the ports in your switch Installing the Switch in a Rack Connecting Devices to the SwitchConnecting Power Verifying Installation BayStack 70-24T 10/100 Ethernet Switch LED Display Checking the Diagnostic DisplaysDescription of Switch and Port Status LEDs Page Using the LED Display Chapter TroubleshootingPage Table A-1 Technical Specifications Appendix a Technical SpecificationsProduct Specifications Electromagnetic Emissions Physical SpecificationsEnvironmental Specifications Electromagnetic Susceptibility Safety Agency ApprovalsPerformance Specifications Page RJ-45 Appendix B Cables and ConnectorsTable B-1 RJ-45 Connector Pin Assignments 10BASE-T/100BASE-TX UTP CableFigure B-1. Straight-Through Twisted-Pair Cable Straight-Through and Crossover CablesNumbers IndexIndex-2