Dell PowerEdge M605 - Manual (Page 268)

244 PHY Diagnostics Commands
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Default Configuration
This command has no default configuration.
Command Mode
Privileged EXEC mode
User Guidelines.
During the test shut down the port under test unless it is a combo port with an active fiber
port.
NOTE: The maximum distance VCT can function is 120 meters.
Examples
The following example results in a report on the cable attached to port 1/g3.
console#test copper-port tdr 1/g3
Cable is open at 64 meters
The following example results in a failure to report on the cable attached to port 2/g3.
console#test copper-port tdr 2/g3
Can’t perform the test on fiber ports