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99
of the error will be displayed (how many meters it is away from the port).
Command mode: Port Configuration Mode.
Default Settings: No link test.
Usage Guide: The RJ-45 port connected with the twisted pair under test should be in
accordance with the wiring sequence rules of IEEE802.3, or the wire pairs in the test
result may not be the actual ones. On a 100M port, only two pairs are used: (1, 2) and (3,
6), whose results are the only effective ones. If a 1000M port is connected to a 100M port,
the results of (4, 5) and (7, 8) will be of no meaning. The result may have deviations
according to the type of the twisted pair, the temperature, working voltage and other
conditions. When the temperature is 20 degree Celsius, and the voltage is stable without
interference, and the length of the twisted pair is no longer than 100 meters, a deviation of
+/- 5 meters is allowed.
568A wiring sequence: (1 green white, 2 green), (3 orange white, 6 orange), (4 blue, 5
blue white), (7 brown white, 8 brown).
568B wiring sequence: (1 orange white, 2 orange), (3 green white, 6 green), (4 blue, 5
blue white), (7 brown white, 8 brown).
Example: Test the link status of the twisted pair connected to the 1000M port 1/25.
Switch(config)#interface ethernet 1/25
Switch(Config-If-Ethernet1/25)#virtual-cable-test
Interface Ethernet1/25:
--------------------------------------------------------------------------
Cable pairs Cable status Error length (meters)
--------------- ----------------- --------------------------
(1, 2) open 5
(3, 6) open 5
(4, 5) open 5
(7, 8) short 5