Chapter 11
| Interface Commands
Cable Diagnostics
– 450 –
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: 1-8)
port - Port number. (ECS4620-28F/28F-DC: 23-24,
Other models: 1-24/48)
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.
◆ 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.
◆ 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 any Gigabit Ethernet ports
linked up at a speed lower than 1000 Mbps.
■
Impedance mismatch: Terminating impedance is not in the reference
range.
Example
Console#show cable-diagnostics interface ethernet 1/24
Port Type Link Status Pair A (meters) Pair B (meters) Last Update
-------- ---- ----------- ---------------- ---------------- -------------------
Eth 1/48 GE Up OK (1) OK (1) 2012-08-09 10:24:49
Console#
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