What are some of the basic advantages of twisted pair wiring?
Lower noise due to inductively coupled current from interference sources, such as (say) a motor or AC power line. When a changing magnetic field is near a coil of wire, it induces a current in the wire. If that wire is your network cable, the current will be misinterpreted by the receiving NIC as voltage generated by the sender, which will cause packet corruption. With twisted pair wire, after a twist the magnetic field ends up creating a current in the opposite direction since the order of the wires has switched. Therefore, the current induced from adjacent twists of the wire ends up cancelling. (Assuming the magnetic field strength is consistent over the distance of 2 twists.)
