Chapter 10
| Interface Commands
Cable Diagnostics
– 360 –
â—† 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 of each cable pair.
â—† Potential conditions which may be listed by the diagnostics include:
â–
OK: Correctly terminated pair
â–
Open: Open pair, no link partner
â–
Short: Shorted pair
â–
Not Supported: This message is displayed for Gigabit Ethernet ports linked
up at a speed lower than 1000 Mbps.
â–
Impedance mismatch: Terminating impedance is not in the reference
range.
â—† Ports are linked down while running cable diagnostics.
Example
Console#test cable-diagnostics interface ethernet 1/23
Console#
show cable-
diagnostics
This command shows the results of a cable diagnostics test.
Syntax
show cable-diagnostics interface [interface]
interface
ethernet unit/port
unit - Unit identifier. (Range: 1)
port - Port number. (Range: 1-10/24)
Command Mode
Privileged Exec
Command Usage
â—† 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.
â—† To ensure more accurate measurement of the length to a fault, first disable
power-saving mode on the link partner before running cable diagnostics.
â—† The reported distance to a fault is accurate to +/- 4 meters for most cables.
However, depending on cable quality, accuracy may be within +/- 6 meters.
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