Originally posted by Derrick: Twisted pair was invented to prevent crosstalk between the seperate wires. Logically you would have to conclude that splitting cat 5 would be less troublesome than splitting cat 3 considering that it has more twists per inch.
What I was hearing in the origanal question was: Can you use Cat5 spec wiring for both voice and data without compromising the integrity of the voice or data? So in this scenario I am assuming he doesn't need all the conductors for data and he is asking will using the spare pairs for voice cause a problem. The answer is no. It will not affect the speed or interfere with the data if this application requires less than the four pairs. Cat5 has on average 3 twist per inch (although each pair has a slightly different amount of twists per inch). As stated above it is designed to eliminate cross talk even with the higher frequencies. Many times buildings are prewired with Cat5 and that is all you have to work with. If only two pairs are being used for data (10BASE-T or 100BASE-TX)then it will not cause any problems to use the remaining pairs for voice if the wiring is free of faults and the pairs are balanced.
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