C
HAPTER
29
| Interface Commands
Cable Diagnostics
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u Ports are linked down while running cable diagnostics.
u To ensure more accurate measurement of the length to a fault, first
disable power-saving mode (using the no power-save command) on the
link partner before running cable diagnostics.
u The test takes approximately 5 seconds. Use the show cable-
diagnostics command to display the results of the test, including
common cable failures, as well as the status and approximate length of
each cable pair.
EXAMPLE
Console#test cable-diagnostics interface ethernet 1/24
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: 1-24/48)
COMMAND MODE
Privileged Exec
COMMAND USAGE
u 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.
u 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.
u Potential conditions which may be listed by the diagnostics include:
n
OK: Correctly terminated pair
n
Open: Open pair, no link partner
n
Short: Shorted pair
n
Not Supported: This message is displayed for any Fast Ethernet
ports that are linked up, or for any Gigabit Ethernet ports linked up
at a speed lower than 1000 Mbps.
n
Impedance mismatch: Terminating impedance is not in the
reference range.
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