Twisted pair cables are cables that twist two different insulated wires together, similar to twisted pair cables, to reduce the impact of electromagnetic radiation and external electromagnetic interference. A cable that contains several (usually 15 to thousands of pairs) of twisted pairs (two insulated core wires twisted into pairs) is called a twisted pair cable. The commonly used twisted pair cable is composed of 4 pairs of twisted pairs twisted counterclockwise at a certain density, with the outer layer wrapped in a metal layer or plastic rubber skin. The diameter of copper wire is 0.4mm to 1mm. The twisting direction is counterclockwise, with a twisting distance of 3.81cm-14cm, and the difference in twisting length between adjacent twisted pairs is about 1.27cm. The winding density and direction of twisted pair, as well as the insulation material, directly affect its characteristic impedance, attenuation, and near-end crosstalk
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