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

Models: DUA1770-0AAA04

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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)

Image 54

3Com DUA1770-0AAA04 manual Solving Problems, Indicated by LEDs, solutions below, The Power LED does not light

Contents

Switch 4950 3C17706 Switch 4900 Series Getting Started GuideSwitch 4900 3C17700 Switch 4900 SX 3C17702 Switch 4924 3C17701 SuperStackEnd of Life Statement UNITED STATES GOVERNMENT LEGENDENVIRONMENTAL STATEMENT Regulated Materials Statement2 INSTALLING THE SWITCH CONTENTS1 INTRODUCING THE SUPERSTACK 3 SWITCH 4900 SERIES ABOUT THIS GUIDE3 SETTING UP FOR MANAGEMENT Choosing the Correct Fiber CablesSNMP Management C TECHNICAL SPECIFICATIONS D TECHNICAL SUPPORT PROBLEM SOLVINGSAFETY INFORMATION PIN-OUTSPage ABOUT THIS GUIDE Notice Icons ConventionsCommands Table 2 Text ConventionsRelated DocumentationDocumentation documentation Documentation ProductRegistration Comments1000BASE-SX Ports GBIC Ports LEDs Switch - Rear View Detail About the Switches Summary of Hardware FeaturesSwitch - Front View Detail 100/1000BASE-T and 10/100/1000BASE-T Ports Unit Information Label Power Socket Redundant Power System Socket12 CHAPTER 1 INTRODUCING THE SUPERSTACK 3 SWITCH 4900 SERIES Hardware Features Switches Table 3 Hardware featuresFigure 2 Switch 4900 SX - front view Switch - Front View DetailFigure 1 Switch 4900 - front view 14 CHAPTER 1 INTRODUCING THE SUPERSTACK 3 SWITCH 4900 SERIESFigure 3 Switch 4924 - front view Figure 4 Switch 4950 - front view Switch - Front View DetailPorts cross-over Color Power/Self Test LEDTable 4 LED behavior IndicatesFigure 5 Switch 4900 - rear view Switch - RearView Detail Figure 6 Switch 4900 SX - rear viewPower Socket Default Settings supported by your Switchthe Switch units, it is returned to these defaults The Power-up Sequence Switch 4950 - GBIC Operation INSTALLING THE SWITCHPackage Contents Choosing a Suitable Site Rack-mounting Placing Units On Top of Each Other Creating an XRN Distributed FabricPackage Contents Choosing a SuitableSite Rack-mounting 4 Repeat steps 2 and 3 for the other side of the Switch The maximum number of Switch units that can be interconnected is two Switch The Power-upPowering-up the SequenceIf there is evidence of a problem, see “Solving Problems Indicated by Fiber Cables Approved GBIC Switch 4950 - GBICOperation TransceiversFiber SC connector Type 4 GBIC with internal EEPROM fitted 3 The transceiver connects to the network using a duplex SC connector. Attach a male duplex SC connector on the network cable into the duplex SC connector on the transceiver 32 CHAPTER 2 INSTALLING THE SWITCH Viewing Automatically Configured IP Information SETTING UP FOR MANAGEMENTSetting Up Overview Manually Configuring IP Information Methods of Managing a Switchwhole setup process is summarised in Figure 12. Detailed procedural Setting UpOverview Figure 12 Initial Switch Setup and Management Flow diagramManual IP Configuration Automatic IP Configurationon page You should use the automatic IP configuration method ifManually Configuring IP Information Pre-requisitesSetting Up the Switch with IP Information Connecting the Workstation to the SwitchConfiguring the Workstation with IP Information IP addressUsing Command Line Interface via Telnet Figure 14 Example top-level command line interface menu Pre-requisitesYou can find pin-out diagrams for both cables in Appendix B on page Connecting the Workstation to the SwitchFigure 15 Connecting a workstation to the Switch via the console port Setting Up the Switch with IP Information Figure 16 Example top-level command line interface menu42 CHAPTER 3 SETTING UP FOR MANAGEMENT Automatically Configured IPViewing InformationConnecting the Workstation to the Switch 44 CHAPTER 3 SETTING UP FOR MANAGEMENTPre-requisites Viewing IP Information via the Console Port Figure 18 Example top-level command line interface menu 46 CHAPTER 3 SETTING UP FOR MANAGEMENTRefer to “Setting Up Command Line Interface Management” on page Refer to “Setting Up Web Interface Management” on pageusing Telnet Command LineRefer to “Setting Up SNMP Management” on page Interfacetelnet Setting Up Webdescribed in “Setting Up Overview” on page Choosing a Browser50 CHAPTER 3 SETTING UP FOR MANAGEMENT Over the Networkhttp//xxx.xxx.xxx.xxx c\ pingPasswords Setting Up SNMPDefault Users and system management snmp community command - refer to theThe gettingStarted command on the CLI, or The security device user modify command on the CLI, orYou can change the default passwords using either Default UsersPROBLEM SOLVING Solving Problems Indicated by LEDs Solving Hardware ProblemsSolving Communication Problems Solving Software Upgrade Problems The Power LED does not light Solving Problemssolutions below On powering-up, the Power/Self Test LED lights yellowProblems Solving HardwareA fan failure warning message is received Error message indicating that the GBIC transceiver is invalid Error message indicating that the GBIC transceiver is faultyUnit fails, no SNMP fan failure message is received Solving Communication Problems IP AddressingHow do you obtain a registered IP Address? SAFETY INFORMATION Important Safety Information Important Safety Information 62 APPENDIX A SAFETY INFORMATION L’information de Sécurité Importante AVERTISSEMENT France et Pérou uniquement 3CGBIC91 GBIC SX 3CGBIC92 GBIC LX 3CGBIC97 GBIC LH70 Wichtige Sicherheitsinformationen VORSICHT EuropeWichtige Sicherheitsinformationen 68 APPENDIX A SAFETY INFORMATION B PIN-OUTS PC-AT Serial CableAssignments Modem CableRJ-45 Pin Pin assignments are identical for 10/100BASE-T and 1000BASE-T RJ-4510/100BASE-T Table 11 Pin assignmentsPin Number 1000BASE-T72 APPENDIX B PIN-OUTS 413 mm 16.27 in. not including bulge. Weight 6.4 Kg 14.10 lbs TECHNICAL SPECIFICATIONSSwitch 4900 SX Height 65.8 mm 2.59 in. x Width 440 mm 17.3 in 413 mm 16.27 in. not including bulge. Weight 6.91 Kg 15.23 lbsHeat Dissipation Power SupplyProtocols Used for Administration Standards SupportedOnline Technical ServicesServices World Wide Web SiteUsername anonymous Latin America Asia, Pacific RimEurope, Middle East and Africa aprtechnicalsupport@3com.comCountry CountryTelephone Number Telephone NumberReturning Products for Repair Country CountryTelephone Number Telephone NumberINDEX NumbersPage FCC STATEMENT How to Identify and Resolve Radio-TV Interference ProblemsREGULATORY NOTICES INFORMATION TO THE USER