Telephone copper wire is the most common type of medium in twisted pair (TP), which is composed of two insulated copper wires twisted together at a certain density. The two insulated copper wires are twisted together at a certain density, and the electromagnetic waves radiated by each wire during transmission are offset by the electromagnetic waves emitted by the other wire, thus reducing the degree of signal interference. Twisted pair cables are generally composed of two 0.4-0.9mm insulated steel wires wrapped around each other. If one or more pairs of twisted pairs are placed in an insulating sleeve, it becomes a twisted pair cable. In twisted pair cables (also known as twisted pair cables), different pairs of wires have different twisted length. Generally speaking, the twisted length is within 14-38.1cm, twisted counterclockwise, and the twisted length of adjacent pairs is above 12.7cm. Compared with other media, double ripple lines are subject to certain limitations in terms of transmission distance, channel width, and data transmission speed, but their prices are relatively cheap. Twisted pair cables can be divided into two categories: shielded twisted pair cables and unshielded twisted pair cables (UTP). The bandwidth of digital signal transmission using double ripple lines depends on the quality, length, and transmission technology of the wires used. The outer layer of shielded twisted pair cables is wrapped in aluminum foil to reduce radiation, but it cannot completely eliminate radiation. The price of shielded twisted pair cables is relatively high, and installation is more difficult than unshielded twisted pair cables. Similar to coaxial cables, it must be equipped with special connectors that support shielding functions and corresponding installation techniques. But it has a high transmission rate, reaching 155Mb/s within 100m
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