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210 CHAPTER 18: MANAGING DEVICE DIAGNOSTICS
■ Cable Fault Distance — Indicates the distance in meters from the
port where the cable error occurred.
■ Last Update — Indicates the last time the port was tested.
Configuring Cable
Diagnostics
The Diagnostics Page contains fields for performing tests on copper
cables. Cable testing provides information about where errors occurred in
the cable, the last time a cable test was performed, and the type of cable
error which occurred. The tests use Time Domain Reflectometry (TDR)
technology to test the quality and characteristics of a copper cable
attached to a port.
When performing cable tests consider the following:
■ During the tests, ports are in the down state.
■ The minimum cable length resolution is one meter, so if the cable is
shorter than 1 meter the test will display “no cable”.
■ An open cable or a 2-pair copper cable will display a cable fault
distance of 0.
■ The maximum cable length is 120 meters.