On 10/10/2014 09:45 AM, p...@wpnet.us wrote:
> If you can TDR from both ends of the cable, knowing the exact VP doesn't 
> matter. The fault will be in the middle between the two readings. I've used 
> this to find faults in twisted pair audio cable using a coax TDR.
>
Also, if the far end is not terminated, or offers enough 
discontinuity to show up
on the TDR trace, you can measure the whole length of the 
line and compute
how far down the fault is.

Jon

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