◆
Cable diagnostics can only be performed on twisted-pair media.
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This cable test is only accurate for Gigabit Ethernet cables 7 - 100 meters long.
◆
The test takes approximately 5 seconds. The switch displays the results of the
test immediately upon completion, including common cable failures, as well as
the status and approximate length to a fault.
◆
Potential conditions which may be listed by the diagnostics include those listed
below. Note that TDR testing can only show Test failed or OK.
■
Test failed
■
OK: Correctly terminated pair
■
Open: Open pair, no link partner
■
Short: Shorted pair
■
Impedance mismatch: Terminating impedance is not in the reference
range.
■
No cable
■
Not tested
■
Not Supported: This message is displayed for any Gigabit Ethernet ports
linked up at a speed lower than 1000 Mbps
■
Unknown – Unknown error
◆
Ports are linked down while running cable diagnostics.
Parameters
These parameters are displayed:
◆
Port – Switch port identifier.
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Type – Displays media type. (GE – Gigabit Ethernet, Other – SFP)
◆
Link Status – Shows if the port link is up or down.
◆
Test Result – The results include common cable failures, as well as the status
and approximate distance to a fault, or the approximate cable length if no fault
is found.
To ensure more accurate measurement of the length to a fault, first disable
power-saving mode on the link partner before running cable diagnostics.
For link-down ports, the reported distance to a fault is accurate to within +/- 2
meters. For link-up ports, the accuracy is +/- 10 meters.
◆
Last Updated
– Shows the last time this port was tested.
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Test – Initiates cable test.
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