3. Troubleshooting Functional Failures in Operation323.4.4 Actions against Troubles on 1000BASE-XIf a trouble occurs on 1000BASE-X, follow the procedure below to isolate the problem.1. Checking logFor the log, see the manual "Message Log Reference."2. Isolating the problem according to the failure analysis methodIsolate the problem according to the failure analysis method listed below.Table 3-10: Failure Analysis Method for Troubles on 1000BASE-X5 According to the failurestatistical informationdisplayed by the showinterfaces command,check to see if the statisticalinformation below iscounted for the port.If counted, see "Problem"and "Action" columns.• Long framesPackets withinvalid framelength are received.Follow the jumbo frame setting on the remote system.6 Check to see if statistics inthe following is not countedby the show qosqueueing command. If itis counted, see "Problem"and "Action" columns.• discard_pktPackets are beingdiscarded.Review the system maintenance using discard control and shaper.No. Troubleshooting Steps Problem Action1 According to the failurestatistical information displayedby the show interfacescommand, check to see if thestatistical information below iscounted for the port. If counted,see "Problem" and "Action"columns.• Link down• Signal detect errorsLine quality onreceiving side isdegraded.Check the type of fiber optics. For the fiber optics type, see "HardwareInstallation Guide."Check the attenuation value if an optical attenuator is used. For theoptical level, see "Hardware Installation Guide."Check the cable length. For the cable length, see "Hardware InstallationGuide."Check to see if the cable is connected correctly. Check to see if endsurfaces of the cable are dirty. If they are dirty, remove the dirt.Check to see if the transceiver is connected correctly.Use the same values as the remote system in configuration commandsspeed and duplex.Follow the segment standard on the remote system.Check to see if the optical level is correct. For the optical level, see"Hardware Installation Guide."Perform the line test on this system and confirm that there is no problemin the receiving function. See the execution results of the no testinterfaces command and follow the indicated actions.For the test type to be specified, see "6.1 Testing Line."No. Troubleshooting Steps Problem Action
