Diagnosing the Device & Network Diagnosing the Device
User Guide 815
Status Displays the cable status. Test results include normal, closed, open and crosstalk.
Normal : The cable is connected normally.
Closed: A short circuit is being caused by abnormal contact of wires in the cable.
Open: No device is connected to the other end or the connection is broken.
Crosstalk: Impedance mismatch due to the poor quality of the cable.
Length If the connection status is normal, the length range of the cable is displayed.
Fault Location If the connection status is short, close or crosstalk, here displays the length from
the port to the trouble spot.
1.2 Using the CLI
On privileged EXEC mode or any other configuration mode, you can use the following
command to check the connection status of the cable that is connected to the switch.
show cable-diagnostics interface { fastEthernet
port
| gigabitEthernet
port
| ten-
gigabitEthernet
port
}
View the cable diagnostics of the connected Ethernet Port.
port
: Enter the port number in 1/0/1 format to check the result of the cable test.
show cable-diagnostics careful interface { fastEthernet
port
| gigabitEthernet
port
| ten-
gigabitEthernet
port
}
View the cable diagnostics of the connected Ethernet Port. When taking the careful cable test, the switch
will only test the cable for the port which is in the link-down status.
port
: Enter the port number in 1/0/1 format to check the result of the cable test.
The following example shows how to check the cable diagnostics of port 1/0/2:
Switch#show cable-diagnostics interface gigabitEhternet 1/0/2
Port Pair Status Length Error
Gi1/0/2 Pair-A Normal 2 (+/- 10m) ---
Pair-B Normal 2 (+/- 10m) ---
Pair-C Normal 0 (+/- 10m) ---
Pair-D Normal 2 (+/- 10m) ---
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