Actually it is Category 5 (or 5E) Unshielded Twisted Pair cable. Cat 5 transfers at 10/100 mbs and Cat 5E transfers data at 1000 mbs.
There are four sets of twisted pairs that are primarily there to help prevent radio frequency Interference. The ends of the four pairs get separated to make eight strands that get firmly inserted into the plastic RJ 45 8 pin connector. The RJ 45 connector is similar to the four pin RJ 11 telephone connector/plug. Thanks and have a great day : FWIW, that cable coming from his wall socket is an RJ45 cable (Ethernet : cat5). Its how they're wired. I've seen some installations happening : in office buildings * got 80 ft of cat5 free too*. :
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