Справочник Пользователя для 3com 2924-PWR

C

HAPTER

 18: M

ANAGING

 D

EVICE

 D

IAGNOSTICS

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Cable Fault Distance — Indicates the distance in meters from the 
port where the cable error occurred.

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Last Update — Indicates the last time the port was tested.

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.