3Com 3CRDSF9PWR-US - OfficeConnect Managed Fast Ethernet PoE Switch, Руководство пользователя

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Configuring Cable Diagnostics 221
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Failed — Indicates that the cable failed the test. The test will fail if a
cable is not connected to the port, the cable is connected on only
one side, the cable is shorter than one meter, or a short has
occurred in the cable.
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Cable Fault Distance — Indicates the distance in meters from the
port where the cable error occurred. The number pair indicates the
fault distance for transmit/receive signals.
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Last Update — Indicates the last time the port was tested.
Defining Cable
Diagnostics
The Diagnostics Page contains fields for performing tests on copper
cables. Cable testing provides information about where errors occurred in
the cable, and the last time a cable test was performed.
When performing cable tests consider the following:
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During the tests, ports are in the down state.
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The minimum cable length resolution is one meter, so if the cable is
shorter than one meter the test will display “Failed.”
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An open cable or a 2-pair copper cable will display a cable fault at a
distance of 0 meters.
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The maximum cable length is 120 meters.