Service Manual

Time Domain Reflectometer (TDR)
TDR is useful for troubleshooting an interface that is not establishing a link; either it is flapping or not coming up at all. TDR detects open or
short conditions of copper cables on 100/1000 Base-T modules.
Important Points to Remember
• The interface and port must be enabled (configured — refer to the interface command) before running TDR. An error message is
generated if you have not enabled the interface.
• The interface on the far-end device must be shut down before running TDR.
• Because TDR is an intrusive test on an interface that is not establishing a link, do not run TDR on an interface that is passing traffic.
• When testing between two devices, do not run the test on both ends of the cable.
tdr-cable-test
Test the condition of copper cables on 100/1000 Base-T modules.
Syntax
tdr-cable-test interface
Parameters
interface Enter the keyword TenGigabitEthernet then the slot/port information for the
100/1000 Ethernet interface.
Defaults none
Command Modes EXEC
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information
The interface must be enabled to run the test or an error message is generated:
Dell#tdr-cable-test tengigabitethernet 5/2
%Error: Interface is disabled Te 5/2
Related Commands show tdr — displays the results of the TDR test.
show tdr
Display the TDR test results.
Syntax
show tdr interface
Parameters
interface Enter the keyword TenGigabitEthernet then the slot/port information for the
100/1000 Ethernet interface.
556 Interfaces