Planet SGS-6341 Series Command Manual page 140

Function:
Test the link of the twisted pair cable connected to the Ethernet port. The response may include: well, short, open, fail.
If the test information is not well, the location of the error will be displayed (how many meters it is away from the
port).
Command mode:
Port Configuration Mode.
Default:
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 +/-2 meters
is allowed. Notice: the test procedure will block all data flow on the line for 5-10 seconds, and then restore the original
status.
Notice: combo port support VCT function detection only at copper cable port mode.
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 1/0/25.
Switch(config)#interface ethernet 1/0/25
Switch(Config-If-Ethernet1/0/25)#virtual-cable-test
Interface Ethernet1/0/25:
--------------------------------------------------------------------------
Cable pairs
---------------
(1, 2)
(3, 6)
(4, 5)
(7, 8)
Cable status Error length (meters)
----------------- --------------------------
open 5
open 5
open 5
short 5
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SGS-6341 Series Command Guide