Chapter 10
| Interface Commands
Cable Diagnostics
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◆ 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.
◆ Potential conditions which may be listed by the diagnostics include:
■
OK: Correctly terminated pair
■
Open: Open pair, no link partner
■
Short: Shorted pair
■
Not Supported: This message is displayed for Gigabit Ethernet ports linked
up at a speed lower than 1000 Mbps.
■
Impedance mismatch: Terminating impedance is not in the reference
range.
◆ 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
◆ 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.
◆ 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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