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Beginner

Understanding cable diagnostics output

Hi guys,

I have this output from a cable diagnostic test that I did. How do I pinpoint at which end the pair is open? Is it at the closet end or user end?

show cable-diagnostics tdr int f0/39


TDR test last run on: January 27 10:45:54



Interface Speed Local pair Pair length        Remote pair Pair status


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


Fa0/39    auto  Pair A     6    +/- 1  meters N/A         Open                <===


                Pair B     39   +/- 1  meters N/A         Open                <===


                Pair C     N/A                N/A         Not Supported      


                Pair D     N/A                N/A         Not Supported      


Thanks in advance.

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Hall of Fame Community Legend

Re: Understanding cable diagnostics output

You mean at both locations?

Look at the output of the "sh cable test tdr".

Pair A is detected to be 6 metres away from the switch port (+/- 1 metre error).  Pair B is detected to be 39 metresaway from the switch port (+/- 1 metre error).

Pair C and Pair D is not tested because your interface is a fastethernet interface.

View solution in original post

8 REPLIES 8
Hall of Fame Community Legend

Re: Understanding cable diagnostics output

"open" means the far end has nothing connected to it.

"normal" means good and something is connected to the far end.

"short" means short circuit.

"Impedance Mismatched" means a Cat5 cable has been joined with a Cat6 cable.

Don't forget to rate our useful posts.  Thanks.

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Beginner

Re: Understanding cable diagnostics output

How do I know how far from the switch is it open/broken?

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Hall of Fame Community Legend

Re: Understanding cable diagnostics output

How do I know how far from the switch is it open/broken?

In your output, under "Pair" is the length.  Do you see that you have two disparate distance?  It means you have a break somewhere.

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Beginner

Re: Understanding cable diagnostics output

So there's no way to see exactly where it's broken?

Thanks anyway...

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Hall of Fame Community Legend

Re: Understanding cable diagnostics output

6 and 39 metres from the switch's port.  +1/-1 metre error.

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Beginner

Re: Understanding cable diagnostics output

You mean at both locations?

Highlighted
Hall of Fame Community Legend

Re: Understanding cable diagnostics output

You mean at both locations?

Look at the output of the "sh cable test tdr".

Pair A is detected to be 6 metres away from the switch port (+/- 1 metre error).  Pair B is detected to be 39 metresaway from the switch port (+/- 1 metre error).

Pair C and Pair D is not tested because your interface is a fastethernet interface.

View solution in original post

Highlighted
Beginner

Re: Understanding cable diagnostics output

I take that as a yes


Thanks.

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