I heard about a tester which measure the lenght of the cables, but I don't know how it work. Does it measure only the resistence cable or does it measure even inductance and/or capacitance? When I do the measure do I have to connect end cables or have I to leave ends opened? Thanks.
Some ethernet PHY chips have this built in. I believe they measure the delay of a pulse and it's reflection off of the unterminated end of the cable. They can use this to report opens, and how far they are away from the PHY.
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Regards,
Robert Monsen
"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.
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