3Com DUA1770-0AAA04 manual Solving Problems, Indicated by LEDs, Solutions below

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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. The fault type will be indicated on the unit LEDs. 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 10BASE-T or 100BASE-T where auto-negotiation is disabled and incorrect cables are being used (cross-over or straight)

Auto-negotiation problems will occur with fiber if:

■The Receiver (RX) and Transceiver (TX) cable connectors are swapped

■Fibers are broken

■Auto-negotiation differs at either end (a link appears at the ‘fixed’ end and not at the auto-negotiation end)

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Contents SuperStack 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents Setting UP for Management PIN-OUTS Page About this Guide Conventions Icon DescriptionConvention Description Related DocumentationDocumentation documentation 3Com recommends that you copy the Docs/referenceguide Please include the following information when commentingSuperStack 3 Switch 4900 Series Getting Started Guide Directory as a whole to maintain the structure of the filesIntroducing Introducing the Superstack 3 Switch 4900 Series Hardware Features Switches Switch Front View Detail Switch 4900 front viewSwitch 4924 front view Ports cross-over Module Status LEDs Power/Self Test LEDColor Indicates Port Status LEDs Unit LEDsSwitch Rear Switch 4900 rear viewPower Socket Switch 4924 rear viewDefault Settings Supported by your SwitchSwitch units, it is returned to these defaults Installing the Switch Package Contents Choosing a SuitableSite Desk, or attach it to a wall Flow through the side panels of the SwitchRack-mounting Have been fittedRepeat steps 2 and 3 for the other side of the Switch Fitting a bracket for rack-mountingInterconnecting two Switch 4900 units Switch Power-upPowering-up SequencePower System output Your Switch RJ-45 connector is now a grounded portThat contain alignment pins can cause damage to your Switch OptionsApproved Gbic Switch 4950 GbicOperation TransceiversFiber SC connector Type 4 Gbic with internal Eeprom fitted Inserting a Gbic Transceiver into a SwitchSwitch 4950 Gbic Operation 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 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 19,200 baud Data bitsSetting Up the Switch with IP Information Configured IP ViewingAutomatically Pre-requisites Viewing IP Information via the Console Port Example top-level command line interface menu 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 Http//xxx.xxx.xxx.xxxSetting Up Snmp Default UsersPasswords User Default Name Password Access Level Security Device User Modify operation on the web interfaceProblem Solving For Technical Support information, see Appendix DPower LED does not light Solving ProblemsSolutions below On powering-up, the Power/Self Test LED lights yellowFan failure warning message is received ProblemsSolving Hardware For further information about RMON, refer to StatusError message indicating that the Gbic transceiver is faulty Unit fails, no Snmp fan failure message is receivedSolving Communication Problems IP AddressingHow do you obtain a registered IP Address? Safety Information Important Safety Information This must be approved for the country where it is usedImportant Safety Information 3CGBIC91 Gbic SX 3CGBIC92 Gbic LX ’information de Sécurité Importante SchkoAppendix a Safety Information 3CGBIC91 Gbic SX 3CGBIC92 Gbic LX Wichtige Sicherheitsinformationen Der Netzstecker muß die Norm CEE 7/7 erfüllen SchukoWichtige Sicherheitsinformationen Appendix a Safety Information PC-AT Serial Cable Null Modem Cable 9-pin to RS-232 25-pinPin to 9-pin RJ-45 Pin ConnectorsModem Cable AssignmentsPin Number 10/100BASE-T 1000BASE-T Appendix B PIN-OUTS Power Consumption Physical DimensionsSafety Same unless otherwise statedHeat Dissipation Power SupplyProtocols Used for Administration Standards SupportedServices Online TechnicalUsername anonymous Europe, Middle East and Africa Asia, Pacific RimFrom this region, email From this region, enter the URLAsia, Pacific Rim Europe, Middle East and AfricaCountry Telephone Number Asia, Pacific Rim Country Telephone Number Latin America Index NumbersPasswords Regulatory Notices