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Re: Time Domain Reflectometer (was Re: internet outages)

Hmm, intended to send this to the list, sent to John Hasler, only, who did 
respond -- I hope he will copy his reply to the ist (or tell me it is ok to do 

On Monday, December 24, 2018 08:21:57 AM John Hasler wrote:
> As to TDRs, if you can get by without actually seeing pictures of all
> the impedence bumps 

> you can get by with a fast counter, a high risetime
> pulse generator, and a couple of fast comparators.  Maybe $20 at
> Digikey.

Can you elaborate a little on how that would work?