3Com DUA1698 manual Problem

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Solving Problems Indicated by LEDs

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Solving Problems If the LEDs on the Switch indicate a problem, refer to Table 5 which

Indicated by LEDs contains a list of problems and suggested solutions.

Table 5 Problems indicated by LEDs

Problem

Suggested Solution

A Power LED does not Check that the power cable is firmly connected to the

lightrelevant Switch unit and to the supply outlet. If the connection is secure and there is still no power, you may have a faulty power cord.

On powering-up, the Power/Self Test LED lights yellow and a Unit LED lights green

The relevant Switch unit has failed its Power On Self Test (POST) because of an internal problem. Contact your supplier for advice.

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

Check that:

■All connections are secure.

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

■The connection uses cross-over cable if you are linking a 10BASE-T or 100BASE-TX port with a device that is MDIX-only.

For information about solving problems when managing the Switch, refer to the Problem Solving chapter in the “SuperStack Switch Management Guide”.

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Contents SuperStack 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents PIN-OUTS Page Page About this Guide Icon Description ConventionsConvention Description Documentation RelatedProduct YearCompliance CommentsIntroducing the Switch 3300 XM Summary of Features About SuperStack Switch 3300 XMSwitch 3300 XM front view Switch 3300 XM Front View DetailColor Indicates Port Status LEDs Power/Self Test LEDUnit LEDs Power Socket Switch 3300 XM Rear View DetailUnits on Examples ConfigurationSegmentation Switch NetworkUsing the Switch as a collapsed backbone SwitchSwitch Fast Ethernet configuration rules Configuration Rules with Full Duplex Introducing the Switch 3300 XM Installing the Switch Rack-mounting Repeat steps 2 and 3 for the other side of the Switch 3C16965. Contact your supplier for details Stacking UnitsYou need only one SuperStack 3 Switch 3300 MM per stack Stack of three units Sequence Power-upPowered-up and ready for operation Switch 3300 XMCorrect Cables ChoosingColor State Problem Managing SwitchSafety Information Information Important SafetyPersonnel only Important Safety Information Sécurité Importante ’information de’information de Sécurité Importante Wichtige Sicherheitsinformat ionen PC-AT Serial Cable PIN-OUTSAssignments Pin Number Signal FunctionModem Cable RJ45 PinPin Number Signal Function Appendix B PIN-OUTS Environmental Requirements Physical DimensionsSafety Power SupplyVlan MIB RFC Online Technical ServicesUsername anonymous Country Telephone Number Asia, Pacific Rim Europe, South Africa, and Middle EastCountry Telephone Number Fax Number Glossary Endstation BridgeBroadcast CollisionPage Protocol Line speedLoop MulticastTelnet ServerStack SuperStackGlossary Index Index 3Com Corporation Limited Warranty Page Disclaimer Regulatory Notices