3. Troubleshooting Functional Failures in Operation353.4.6 Communication Failure on Using PoEIf electricity is not provided when PoE is in use, isolate the problem using the failure analysis methods listed in thefollowing table.Table 3-12: Communication Failure Analysis Methods When PoE Is in Use3 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. [IP8800/S6700][IP8800/S6600] [IP8800/S6300]• RFLine quality onsending 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.For the transceiver, 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 sending function. See the execution results of the no testinterfaces command and follow the indicated actions. For the testtype to be specified, see "6.1 Testing Line."4 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.• Long framesPackets withinvalid framelength are received.Follow the jumbo frame setting on the remote system.5 Check to see if statistics in thefollowing is not counted by theshow qos queueingcommand. If it is counted, see"Problem" and "Action"columns.• discard_pktPackets are beingdiscarded.Review the system maintenance using discard control and shaper.No. Troubleshooting Steps and Command Action1 Check to see PoEStatus display on the port bythe show power inline command.• PoEStatus indicates offElectricity is not provided. Go to No.2.• PoEStatus indicates deniedA shortage of electricity to the whole equipment occurs. Go to No.3.• PoEStatus indicates faultyElectricity is unable to be provided to the connected equipment. Go to No.4.2 Check to see if the port is shutdown. • The port is shutdownUse the no shutdown command.• The port is not showdownCheck to see if Power receiving equipment is connected properly.No. Troubleshooting Steps Problem Action
