NEC IP8800/S2400 Communication Failure on Using PoE, Troubleshooting Steps and Command Action

3. Troubleshooting Functional Failures in Operation

No.	Troubleshooting Steps	Problem	Action
3	According to the failure	Line quality on	Check the type of fiber optics. For the fiber optics type, see "Hardware
	statistical information displayed	sending side is	Installation Guide."
	by the show interfaces	degraded.
			Check the attenuation value if an optical attenuator is used. For the
	command, check to see if the
			optical level, see "Hardware Installation Guide."
	statistical information below is
	counted for the port. If counted,		Check the cable length. For the cable length, see "Hardware Installation
	see "Problem" and "Action"		Guide."
	columns. [IP8800/S6700]
			Check to see if the cable is connected correctly. Check to see if end
	[IP8800/S6600] [IP8800/
	S6300]		surfaces of the cable are dirty. If they are dirty, remove the dirt.
	• RF		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 problem
			in the sending function. See the execution results of the no test
			interfaces command and follow the indicated actions. For the test
			type to be specified, see "6.1 Testing Line."
4	According to the failure	Packets with	Follow the jumbo frame setting on the remote system.
	statistical information displayed	invalid frame
	by the show interfaces	length are received.
	command, check to see if the
	statistical information below is
	counted for the port.
	If counted, see "Problem" and
	"Action" columns.
	• Long frames
5	Check to see if statistics in the	Packets are being	Review the system maintenance using discard control and shaper.
	following is not counted by the	discarded.
	show qos queueing
	command. If it is counted, see
	"Problem" and "Action"
	columns.
	• discard_pkt

3.4.6Communication Failure on Using PoE

If electricity is not provided when PoE is in use, isolate the problem using the failure analysis methods listed in the following table.

Table 3-12: Communication Failure Analysis Methods When PoE Is in Use

No.	Troubleshooting Steps and Command		Action
1	Check to see PoEStatus display on the port by	•	PoEStatus indicates off
	the show power inline command.	•	Electricity is not provided. Go to No.2.
			PoEStatus indicates denied
			A shortage of electricity to the whole equipment occurs. Go to No.3.
		•	PoEStatus indicates faulty
			Electricity 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 shutdown
			Use the no shutdown command.
		• The port is not showdown
			Check to see if Power receiving equipment is connected properly.

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