Allied Telesis AT-S95 CLI - Manual (Page 163)

PHY Diagnostics Commands
Page 151
Example
The following example displays the estimated copper cable length attached to all ports.
Console show copper-ports cable-length
Port Length [meters]
---- ---------------------
1/g1 < 50
1/g2 Copper not active
1/g3 110-140
1/g1 Fiber