A twisted pair cable is a transmission medium that consists of two copper wires with insulation layers twisted together in a certain pattern, mainly used for information communication networks. The advantage of a twisted pair cable is that it can reduce signal interference and crosstalk, and improve transmission speed and security. Twisted pair cables can be classified into different categories according to the presence or absence of shielding layer and transmission frequency, such as shielded twisted pair (STP), unshielded twisted pair (UTP), category 5 cable (CAT5), category 6 cable (CAT6), etc. Twisted pair cables usually use RJ11 or RJ45 connectors for connection, and need to be made according to a certain wire sequence and method.