In order to reduce the interference of the signal, each of the pairs in the twisted cables are formed by the two insulated copper wires, and the different lines in the same cable have different twists (that is, to twist the coils of the coil (that is, the twisting coils. how much).

At the same time, the lines in the standard twisted cable are twisted in the direction of counterclockwise. However, there are many problems with cables produced by some informal manufacturers: ① In order to simplify the manufacturing process, the density of all wires in the cable is the same;

② The density of the twisting density of the two insulating wires in the line does not meet the technical requirements; ③ The twist direction of the wire pair does not meet the requirements. If there is a problem with the above problems, it will cause the proximal bruises of the twin -twisted wire (referring to the signal interference between the two lines between the two lines in UTP), which makes the transmission distance fail to meet the requirements.

The twisting of the twisted lines has stricter standards in production. When actual purchase, some professional equipment can be measured under conditions, but general users can only observe with the naked eye. It should be noted that the twisting of the five types of UTP in the five types of UTP is more dense than the three categories, and the five categories are more dense than the five categories.

In addition to the two insulated copper conductors that form the twisted pair of twisted lines, the line pairs of the standard twisted cable should be twisted in the direction of the standard twisted cable. Otherwise, it will cause the cable resistance to not match, limiting the transmission distance.

Generally, ordinary users rarely notice. Regarding the twisting of the five types of twisted cables and other related parameters, interested readers can check the TIA/EIA568A (TIA/EIA568 is the wiring standard developed by ANSI in 1996. Including cables, connection devices, etc., the letter "A" is expressed as the wiring standard of IBM, and AT & T is expressed in the letters "B".).