CLI Guide

Switch Management Commands 2090
test copper-port tdr
Use the test copper-port tdr command to diagnose with Time Domain
Reflectometry (TDR) technology the quality and characteristics of a copper
cable attached to a 1GBaseT or 10GBaseT port.
Syntax
test copper-port tdr interface
• interface — A valid Ethernet port.
Default Configuration
This command has no default configuration.
Command Mode
Privileged Exec mode
User Guidelines.
This command prompts the user to shut down the port for the duration of
the test. Passive or active direct attach SFP/SFP+ cables are not based on
1000BaseT technology and do not support TDR testing. Use the show
copper-ports tdr command to view the test results.
The maximum distance the Virtual Cable Tester (VCT) can measure is 120 meters.
Multi-gig ports (2.5G and 5G) must have the cable disconnected at the switch for
the test to yield correct results. Disable green-mode on the port to ensure accurate
results.
Examples
The following example results in a report on the cable attached to port 1/0/3.
console#test copper-port tdr te1/0/1
This command takes the port offline to measure the cable length.
Use the show copper-port tdr command to view the results..
Do you wish to continue and take the port offline (Y/N)?y
The following example results in a failure to report on the cable attached to
port te2/0/3.