Quote:
Originally Posted by heero_yuy
When we run Ethernet across printed circuits ( from the RJ connector to the magnetics ) it's normally done as transmission lines of the correct impedance. I guess in principle a transmission line cable would work and be very flat.
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Different environment.
The whole point of having twists in a pair of wires that are used with a differential signal is to try to ensure that external induced 'noise' is equally present in both wires.
Because the signal is presented differentially the common mode noise can be easily rejected.
Without the twist, the cable that is closest to the noise source would see slightly higher induced voltage and some noise would be presented differentially.
Ian