Actually my problem turned out to be some very dodgy ( please read very early versions ) of a certain DEC21x4x based card. Just wouldn't work back to back ! ( I suspect it was either some sort of negotiation problem , or more likely an impedance matching problem on a short cable run ). BTW there is a reason for keeping the twisted pairs correct e.g. Orange/White & White/Orange is one pair .. This is due to something called common mode rejection and is a fairly standard technique for reducing interference. ( Both general noise & between pairs ). If you mix and match conductors from different pairs - you end up with a very distorted signal and a lot of collisions ). Common mode means in effect "Signals Common to both conductors" A twisted pair carries a differential signal and so if you subtract the signal at the receiving end all you get ( in theory ) is the signal and no noise ! ( Tech mode cancel ! ) Andy. Louis Abney wrote: > > Back to back problems occured for me when I made my own cable and > made the mistake of mixing the twisted pairs for receive and transmit.
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