Effectively improving and ensuring the manufacturing precision and stability of the cable is the key to producing high-performance data cable. Twisted twisting is actually pre-twist, that is, before the twisted pair twists, a certain twist is given to the single wire reversely, so that the characteristic impedance and the frequency varying curve are more stable. The increase in back-twist rate can improve electrical performance, but it also brings about side effects—the single-wire structure is partially destroyed. Therefore, the back-twist rate should be controlled at about 10%, preferably no more than 35%.
The performance of standard technical performance for data cables is difficult to pass including IL and NEXT. They can be improved by increasing the conductor diameter and choosing a better insulation material, by designing a reasonable twist pitch for the four pairs. The effect stabilizes the relative positions of the four pairs and isolates the pairs from each other, reducing crosstalk, improving transmission quality, and ensuring stable and reliable electrical performance. The relative position of the four pairs of wires will change due to the external force, affecting the crosstalk attenuation performance of the cable, resulting in less than the skeleton performance of the electrical performance, so the production process control, equipment performance and other requirements are very important, and then the design of the cable. It is necessary to consider that each index should have enough margin to ensure that it can still meet the requirements for installation.