3Com 1100 User Manual

Also see for SuperStack II 1100 3C16950: User guide

3Com 1100 User Manual Manual pdf 32 page image

32 C HAPTER 2: INSTALLING THE SWITCHSolving ProblemsIndicated by LEDsIf the LEDs on the Switch indicate a problem, refer to Table 5 whichcontains a list of possible problems and suggested solutions.Table 5 Problems indicated by LEDsProblem 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 aUnit LED 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 flashesyellowAn unrecognized Expansion Module or Matrix Module isinstalled into the relevant Switch unit. You may need toremove the Module, or upgrade the managementsoftware used by the Switch to a version that recognizesthe Module. Contact your supplier for further advice.A link is connected andyet the Status LED forthe port does not lightCheck that:n All connections are secure.n The devices at both ends of the link are powered-up.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 a10BASE-T port is lit,but the Status LED forthat port does notlightThe 10BASE-T port is connected to a10BASE-T/100BASE-TX port or a 100BASE-TX port. Doone of the following:n If the 10BASE-T port is connected to a10BASE-T/100BASE-TX port, enable auto-negotiationon the 10BASE-T/100BASE-TX port, or set the10BASE-T/100BASE-TX port to 10Mbps.n If the 10BASE-T port is connected to a 100BASE-TXport, move the 10BASE-T connection to a100BASE-TX connection.The Packet LED for anExpansion Module isflashing even thoughthere is no externaltraffic on 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.16950ua.bk Page 32 Thursday, August 27, 1998 11:55 AM