The Time Domain Reflectometry (TDR) or Cable Diagnostics is a port feature supported on some switches
running ArubaOS-Switch software. TDR is used to detect cable faults on 100BASE-TX and 1000BASE-T ports.
Virtual cable testing
The Virtual Cable Test (VCT) uses the same command as TDR. It is applicable only for GigT transceivers like
copper transceiver (J8177C–ProCurve Gigabit 1000Base-T Mini-GBIC). The VCT test results include distance to
the fault, but not the cable length.
Cable Diagnostics
Syntax
test cable-diagnostics <PORT-LIST>
Description
Use the command to test for cable faults.
Option
PORT-LIST
Specify copper port as a input port number.
Test cable-diagnostics C21
test cable-diagnostics C21
The 'test cable-diagnostics' command will cause a loss of link and will take a few seconds per interface to complete.
Continue [Y/N]? y
MDI Cable Distance Pair Pair MDI
Port Pair Status to Fault Skew Polarity Mode
--------- ------ -------- ----- ------ ------
C21 1-2 Open 0 m 0 ns
3-6 Open 0 m 0 ns
4-5 Open 0 m 0 ns
7-8 Open 1 m 0 ns
Test cable-diagnostics 1/1-1/10
switch# test cable-diagnostics 1/1-1/10
This command will cause a loss of link on all tested ports and will take
several seconds per port to complete. Use the ‘show cable-diagnostics’ command to view
the results.
Continue (y/n)? Y
switch# show cable-diagnostics 1/1-1/10
Cable Diagnostic Status - Copper Ports
MDI Cable Cable Length or
Port Pair Status Distance to Fault
Chapter 19
Cable Diagnostics
Chapter 19 Cable Diagnostics 643
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