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Re: gEDA-user: Fun challenge: cat-5 cable tester



On 8/27/06, DJ Delorie <dj@xxxxxxxxxxx> wrote:
You can't always tell if the cables are miswired, or if there's an
open conductor, which one it is.

You can by knowing the length of the cables; since light in a vacuum travels about 1 foot per nanosecond, and you figure the average cable length is 6 feet, an open OR a short in the fourth pair will occur between 18 and 24 ns from the initial ping.


-- Samuel A. Falvo II


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