3Com 3 manual Solving Problems, Indicated by LEDs, Solutions below, Power LED does not light

Page 54

54CHAPTER 4: PROBLEM SOLVING

Solving Problems

If the LEDs on the Switch indicate a problem, refer to the list of suggested

Indicated by LEDs

solutions below.

The Power LED does not light

Check that the power cable is firmly connected to the Switch and to the supply outlet. If the connection is secure and there is still no power, you may have a faulty power cord or an internal fault. Firstly, check the power cord by:

testing it in another device

connecting a working power cord to the ‘problem’ device

then contact your supplier for advice.

On powering-up, the Power/Self Test LED lights yellow

The Switch unit has failed its Power On Self Test (POST) because of an internal problem. If a port has failed it’s POST, it’s LED will flash green/yellow alternately to indicate that the port is disabled. Contact your supplier for advice.

A link is connected and yet the Status LED for the port does not light

Check that:

The Switch and the device at the other end of the link (or cable) are connected securely.

The devices at both ends of the link are powered-up

The quality of cable is satisfactory

Auto-negotiation settings are the same at both ends.

Auto-negotiation problems will occur with all ports where auto-negotiation is disabled and incorrect cables are being used (cross-over or straight).

Solving Hardware Error message indicating that the SFP transceiver is invalid.

ProblemsThe Switch has identified that the SFP does not meet the minimum requirements for the Switch and has disabled the port. To correct this

Image 54 Contents
SuperStack 3Com Corporation 350 Campus Drive Marlborough, MA United States Government LegendContents Setting UP for Management PIN-OUTS Page About this Guide Conventions Icon DescriptionConvention Description Related DocumentationAbout this Guide Introducing About the Switch FamilySwitch 4200 Family Front View DetailIntroducing the Superstack 3 Switch 4200 Family Port Status LEDs 10/100/1000BASE-T ports Color Indicates Port Status LEDs 10BASE-T/100BASE-TX portsPort Status LEDs SFP ports Unit LEDsLED Color Indicates Power/Self Test LED Rear View DetailAlert LED Rmon Alarm Feature Switch 4200 Family Automatic IP ConfigurationDuplex Mode Quality of Service QoSIntroducing the Superstack 3 Switch 4200 Family Installing the Switch Package Contents Choosing a SuitableSite Rack-mounting Repeat steps 2 and 3 for the other side of the Switch Fitting a bracket for rack-mountingPlacing Units On Top of Each OtherStacking Units Switch 4200 Family Power-upPowering-up SequenceSFP port on the Switch 4200 28-Port SFP OperationColor State Installing the Switch Correct Cables Your SwitchChoosing TransceiverFiber Cables Cross-over Cable Straight-through CableChoosing the Correct Cables Installing the Switch Setting UP for Management Automatically configured IP information Setting UpConfigure IP information manually for your Switch or view OverviewManual IP Configuration Automatic IP ConfigurationSetting UP for Management Manually Configuring IP Information Pre-requisitesConnecting the Workstation to the Switch Configuring the Workstation with IP InformationSetting Up the Switch with IP Information Using Command Line Interface via Telnet Example top-level command line interface menu Connecting a workstation to the Switch via the console port Setting Up the Switch with IP Information Example top-level command line interface menu Configured IP ViewingAutomatically Viewing Automatically Configured IP Information Viewing IP Information via the Console Port Methods of Managing a Switch Refer to Setting Up Command Line Interface Management on Interface Management Command LineNetwork Using Telnet CLI Management viaSetting Up Web InterfaceChoosing a Browser Over the Network Setting Up SnmpManagement Protocol Snmp can manage a Switch if Management workstationDefault Users User Default Access Level Name Password Security device user modify command on the CLI, or Security Device User Modify operation on the web interfaceSetting UP for Management Problem Solving For Technical Support information, see Appendix DPower LED does not light Solving ProblemsSolutions below On powering-up, the Power/Self Test LED lights yellowSolving Communication Problems Error message indicating that the SFP transceiver is faultyIP Addressing Formation Upgrade ProblemsSolving Stack Solving SoftwareSafety Information Important Safety Information This must be approved for the country where it is usedImportant Safety Information ’information de Sécurité Importante Schko Wichtige Sicherheitsinformationen Vorsicht Europe Información de seguridad importante Schuko Importanti informazioni di sicurezza Avvertenza Lunità deve disporre di messa a terra Prodotto Laser Classe Pin to RS-232 25-pin Null Modem CablePC-AT Serial Cable Pin to 9-pinAssignments Modem CableRJ-45 Pin Pin Number 10/100 1000Pin Number 10/100 1000 Appendix B PIN-OUTS Switch 4200 26-Port 3C17300A Switch 4200 50-Port 3C17302A Switch 4200 28-Port 3C17304A Appendix C Technical Specifications Product ServicesRegister Your PurchaseOnline Access SoftwareTroubleshoot DownloadsContact Us Country Telephone Number Latin America Telephone Technical Support and RepairUS and Canada Telephone Technical Support and Repair Index NumbersSFP ports 14 SFP transceiver Regulatory Notices
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