3Com 3CR17451-91 manual Solving Hardware, Problems, Port Status LED is flashing green/yellow

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Solving Hardware Problems

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■ An internal fan has malfunctioned. If a fan has stopped spinning, power off the unit and check the air vents for obstructions. If this situation occurs, the Fault LED will light red.

■ The internal PSU has failed and power is being supplied by an external Redundant Power Supply (RPS). Although the Switch has a fault it will continue to operate normally.

On Powering up, the Power/Self Test LED lights yellow for about ten seconds after which it starts flashing green. This is normal and does not indicate any of the above conditions.

A Port Status LED is flashing green/yellow

The port has failed and has been automatically disabled. The Switch passes its Power On Self Test and continues to operate normally, even if one or more ports are disabled.

A link is connected and yet the Port 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 10BASE-T, 100BASE-TX or
	1000BASE-T where auto-negotiation is disabled and incorrect cables
	are being used (cross-over or straight).

Solving Hardware	In the rare event of your Switch unit experiencing a hardware failure,
Problems	refer to the list of suggested solutions below.
	An expansion module is installed and the unit will not power up
	Ensure that the expansion module is fully seated in the slot and the
	connectors are engaged so that the securing screws can be tightened.

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Contents SuperStack 3 Switch 3870 Family Getting Started Guide United States Government Legend 3Com Corporation Campus Drive Marlborough MA USAContents Setting UP for Management PIN-OUTS Page About this Guide Icon Description ConventionsConvention Description Documentation RelatedDocumentation documentation Comments To access the online documentation from the CD-ROM3870 SwitchHardware Features Switch Front View Detail Switch1000BASE-T Ports Stacking Status LED Color Indicates Port Status/Packet LEDsStack Master LED Fault LED Power/Self Test LEDColor Indicates Module LEDs Unit LEDView Detail Duplex Mode Feature Switch Port StatusType of Unit Total Units in the Stack Maximum Modules Port Port SpeedDefault Settings Introducing the Superstack 3 Switch Installing the Switch Choosing a Suitable Package ContentsSite To rack-mount your Switch Power lines and fluorescent lighting fixturesSwitch, as shown in Figure Rack-mountingFitting a bracket for rack-mounting Repeat steps 2 and 3 for the other side of the SwitchPowered-up and ready for operation Power-upSwitch SequenceCross-over Cable Straight-through Cable Power System outputSFP Operation Remove the plastic protective cover if fitted Transceiver Your SwitchRemoving an SFP Installing the Switch Setting UP for Management Overview Setting UpAutomatic IP Configuration Manual IP ConfigurationSetting UP for Management Pre-requisites Manually Configuring IP InformationSetting Up the Switch with IP Information Connecting the Workstation to the SwitchExample top-level command line interface menu Viewing Configured IPAutomatically Viewing Automatically Configured IP Information Viewing IP Information via the Console Port Refer to Setting Up Command Line Interface Management on Interface Management Command LineWeb Interface ManagementWhere xxx.xxx.xxx.xxx is the IP address of the Switch Network Using TelnetInterface Setting Up WebChoosing a Browser Over the NetworkDefault Users Setting Up SnmpPasswords Security Device User Modify operation on the web interface User Default Access Level Name PasswordProblem Solving Power/Self Test LED does not light Solving ProblemsOn powering-up, the Power/Self Test LED remains yellow Indicated by LEDsRefer to the list of suggested solutions below ProblemsSolving Hardware Port Status LED is flashing green/yellowUnit fails or Snmp thermal shutdown trap is received Fan failure warning message is receivedError message indicating that the SFP transceiver is faulty Solving Communication ProblemsIP Addressing How do you obtain a registered IP Address? Solving Software Upgrade Problems Problem Solving Safety Information This must be approved for the country where it is used Power Cord Set Japan Important Safety InformationImportant Safety Information Class ’information de Sécurité Importante’information de Sécurité Importante Dispositif Laser De Classe Vorsicht Europe Wichtige SicherheitsinformationenLaser Gerät der Klasse Información de seguridad importanteSchuko Appendix a Safety Information CSA Importanti Informazioni di SicurezzaSolo Regno Ważne informacje o zabezpieczeniach Appendix a Safety Information Laser Produkt Klasa Appendix a Safety Information Null Modem Cable RJ-45 to RS-232 25-pin PC-AT Serial CableRJ-45 to 9-pin RJ-45 Pin Assignments Modem CableRJ-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 Services Product to Gain Service BenefitsRegister Your PurchaseDownloads Access SoftwareContact Us Telephone TechnicalAustralia 800 678 Philippines US and Canada Telephone Technical Support and Repair Index SFP Page Chapter Index Regulatory Notices