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New Member

Need clarification regarding the test cable-diagnostics tdr command

Hello,

I've read about the test cable-diagnostics tdr command but I need clarification on the examples listed below to make sure that I am providing the right answer to my co-workers.

Example 1:

CXXX7SW17#show cable-diagnostic tdr int g0/20

TDR test last run on: July 16 10:23:00

 

Interface Speed Local pair Pair length        Remote pair  Pair status

---------    ----       ---------- ------------------      -----------        --------------------

Gi0/20    auto  Pair A     N/A                        N/A                Normal

                       Pair B     72   +/- 10 meters  N/A                Open

                       Pair C     75   +/- 10 meters  N/A                Short/Crosstalk 

                       Pair D     74   +/- 10 meters  N/A                Short/Crosstalk

Does this example mean that there's a cable length issue in the line which is causing the device that it's connected to not to work properly?

Example 2:

CXXX2SW140#show cable-diagnostics tdr int g0/21

TDR test last run on: July 16 09:16:22

 

Interface Speed Local pair Pair length        Remote pair Pair status

---------     -----   ----------     ------------------    -----------       --------------------

Gi0/21    100M  Pair A     N/A                      Pair A           Normal

                          Pair B     N/A                      Pair B           Normal

                          Pair C     N/A                     Pair C           Normal

                          Pair D     N/A                     Pair D           Normal

Does this example state that the cable line is okay for use?

Example 3:

CXXX1SW19#show cable-diagnostics tdr int g0/22

TDR test last run on: July 16 06:36:53

 

Interface Speed Local pair Pair length            Remote pair Pair status

--------- -----        ----------    ------------------        -----------       --------------------

Gi0/22    auto    Pair A       1    +/- 10 meters  N/A               Open

                          Pair B     39   +/- 10 meters   N/A               Open

                          Pair C     72   +/- 10 meters   N/A               Open

                          Pair D     1    +/- 10 meters    N/A               Open

Does this example mean that there isn't a device connected on the other end? No pin-contact?

 

Thank you very much for any help you could provide.

S

1 REPLY
New Member

I found this article here at

I found this article here at supportforums that seemed like the best explanation I've read so far for TDR info.

 

Hope that helps.

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