Dell Command Line Reference Guide for the S4048–ON System 9.14.2.5

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Time Domain Reflectometer (TDR) Commands

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.

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