3Com 3CR17450-91, 3CR17451-91 manual Solving Problems, Indicated by LEDs, Unit LED does not light

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46CHAPTER 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 Unit 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.
	The Unit LED will not light if the Switch 3870 is a standalone unit. If the
	Switch 3870 is part of a stack, the Unit ID will be shown.
	The Power/Self Test 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. 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 for about ten
	seconds after which it starts flashing green.
	On powering-up, the Power/Self Test LED remains yellow
	This indicates one of the following:
	■ A port has failed and has been automatically disabled. You can verify
	this by checking that the Port Status LED is flashing Green/Yellow
	(fast). This could be due to a loop back failure. If a port fails the Switch
	passes its Power On Self Test and continues to operate normally.

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Contents SuperStack 3 Switch 3870 Family Getting Started Guide 3Com Corporation Campus Drive Marlborough MA USA United States Government LegendContents Setting UP for Management PIN-OUTS Page About this Guide Conventions Icon DescriptionConvention Description Related DocumentationDocumentation documentation To access the online documentation from the CD-ROM CommentsSwitch 3870Hardware Features Switch Switch Front View Detail1000BASE-T Ports Color Indicates Port Status/Packet LEDs Stacking Status LEDStack Master LED Power/Self Test LED Fault LEDColor Indicates Module LEDs Unit LEDView Detail Feature Switch Port Status Duplex ModeType of Unit Total Units in the Stack Maximum Modules Port Port SpeedDefault Settings Introducing the Superstack 3 Switch Installing the Switch Package Contents Choosing a SuitableSite Power lines and fluorescent lighting fixtures To rack-mount your SwitchSwitch, as shown in Figure Rack-mountingRepeat steps 2 and 3 for the other side of the Switch Fitting a bracket for rack-mountingPower-up Powered-up and ready for operationSwitch SequencePower System output Cross-over Cable Straight-through CableSFP Operation Remove the plastic protective cover if fitted Your Switch TransceiverRemoving an SFP Installing the Switch Setting UP for Management Setting Up OverviewManual IP Configuration Automatic IP ConfigurationSetting UP for Management Manually Configuring IP Information Pre-requisitesConnecting the Workstation to the Switch Setting Up the Switch with IP InformationExample top-level command line interface menu Configured IP ViewingAutomatically Viewing Automatically Configured IP Information Viewing IP Information via the Console Port Refer to Setting Up Command Line Interface Management on Command Line Interface ManagementWeb Interface ManagementNetwork Using Telnet Where xxx.xxx.xxx.xxx is the IP address of the SwitchSetting Up Web InterfaceChoosing a Browser Over the NetworkSetting Up Snmp Default UsersPasswords User Default Access Level Name Password Security Device User Modify operation on the web interfaceProblem Solving Solving Problems Power/Self Test LED does not lightOn powering-up, the Power/Self Test LED remains yellow Indicated by LEDsProblems Refer to the list of suggested solutions belowSolving Hardware Port Status LED is flashing green/yellowFan failure warning message is received Unit fails or Snmp thermal shutdown trap is receivedSolving Communication Problems Error message indicating that the SFP transceiver is faultyIP Addressing How do you obtain a registered IP Address? Solving Software Upgrade Problems Problem Solving Safety Information Power Cord Set Japan Important Safety Information This must be approved for the country where it is usedImportant Safety Information ’information de Sécurité Importante Class’information de Sécurité Importante Dispositif Laser De Classe Wichtige Sicherheitsinformationen Vorsicht EuropeInformación de seguridad importante Laser Gerät der KlasseSchuko Appendix a Safety Information Importanti Informazioni di Sicurezza CSASolo Regno Ważne informacje o zabezpieczeniach Appendix a Safety Information Laser Produkt Klasa Appendix a Safety Information PC-AT Serial Cable Null Modem Cable RJ-45 to RS-232 25-pinRJ-45 to 9-pin Modem Cable RJ-45 Pin AssignmentsRJ-45 to RS-232 25-pin Pin Number 10/100 1000Pin Number 10/100 1000 Appendix B PIN-OUTS Switch 3870 24 Port Switch 3870 48 Port Product to Gain Service Benefits ServicesRegister Your PurchaseAccess Software DownloadsContact Us Telephone TechnicalAustralia 800 678 Philippines US and Canada Telephone Technical Support and Repair Index SFP Page Chapter Index Regulatory Notices