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Some kinds of cables use only four wires for communication despite more conductors being physically present. In an ethernet 10/100BaseT cable, for example, only four of the eight wires carry data (the others aren't used at all). The four are the ones attached to pins 1, 2, 3, and 6; these are usuallyorange-white/orange and green-white/green, though which is which can vary depending on which version of the standard the person who made the cable was using.

But if you meant something else, you'll need to be more specific. Also, "gigabit" (1000BaseT) cables actually do use all 8 wires.

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Q: Which 4 wires are used for communications?
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