Network cable, generally made of metal or glass, can be used to transmit information within the network. There are three commonly used network cables: twisted pair, coaxial cable, and fiber optic cable (optical fiber). Twisted pair is a data transmission line composed of many pairs of wires. It is characterized by low price, so it is widely used. Twisted pair cable is used to connect with RJ45 crystal head, there are two kinds of STP and UTP, the most commonly used is UTP.
