Cabletron Systems MicroMMAC-24E Installation Manual

Contents

Cabletron Systems MicroMMAC-24E Installation Manual Manual pdf 61 page image

Troubleshooting ChecklistMicroMMAC Installation GuidePage 5-35.2 TROUBLESHOOTING CHECKLISTIf your MicroMMAC is not operating properly, Table 5-1 describes someof the problems that may occur, possible causes for the problem, andsuggestions for resolving the problem.Table 5-1 Troubleshooting ChecklistProblem Possible Causes Recommended ActionNo LEDs on. Loss of Power. Check that the MicroMMAChas adequate power.Cannot contact theMicroMMAC fromin-bandmanagement.ImproperCommunity Namestable.MicroMMAC doesnot have an IPaddress.No link to device.Refer to theMicroMMAC LocalManagement User’s Guide forCommunity Names Table setupand IP address assignmentprocedures.Check the link to theMicroMMAC.User-enteredparameters (IPaddress,Community Names,etc.) are lost whendevice is powereddown.NVRAM resetswitch has beentoggled anduser-enteredparameters havebeen reset to thefactory default.See Chapter 2 for proper use ofthe NVRAM switch.If NVRAM is defective, callCabletron Systems TechnicalSupport.No power to anexternaltransceiverconnected to anEPIM-A.AUI cable may bedefective.Transceiver may bedefective.EPIM is defective.Replace AUI cable.Replace transceiver.Replace EPIM.High Number ofcollisions on EPIMports.Externaltransceiver hasSQE enabled.Disable SQE.