3Com 3300 User Manual

Also see for SuperStack II 3300 FX: User guide

3Com 3300 User Manual Manual pdf 31 page image

Solving Problems Indicated by LEDs 31Solving ProblemsIndicated by LEDsIf the LEDs on the Switch indicate a problem, refer to Table 5 whichcontains a list of known problems and suggested solutions.For information about solving problems when managing the Switch, referto the Problem Solving chapter in the “SuperStack II Switch ManagementGuide” (DUA1695-0BAA0x).Table 5 Known problems indicated by LEDsKnown Problem Suggested SolutionA Power LED does notlightCheck that the power cable is firmly connected to therelevant Switch unit and to the supply outlet. If theconnection is secure and there is still no power, you mayhave a faulty power cord.On powering-up, thePower/Self Test LEDlights yellow and UnitLED lights greenThe relevant Switch unit has failed its Power On Self Test(POST) because of an internal problem. Contact yoursupplier for advice.An Expansion ModuleStatus LED flashes yellowAn unrecognized Expansion Module is installed into therelevant Switch unit. You may need to remove theModule, or upgrade the management software used bythe Switch to a version that recognizes the Module.Contact your supplier for further advice.A link is connected andyet the Status LED for theport does not lightCheck that:n All connections are secure.n The devices at both ends of the link are powered-up.n Tx fiber cables are connected to remote Rx sockets,and Rx fiber cables are connected to remote Txsockets.n The connection uses cross-over cable if you arelinking a 10BASE-T or 100BASE-TX port with a devicethat is MDIX-only.The Packet LED for anExpansion Module isflashing even thoughthere is no external trafficon this linkIf you have a Matrix Module installed into your Switch,this is normal operation. Management software in thestack passes packets between units even if there is noother traffic activity.