In order to reduce the interference of the signal, each line in the twisted wire cable is made of two insulating copper conductors, and the different lines in the same cable have different twisted wounds (that is, the twisting around the coil. 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 twist density of the two insulating wires of the line does not meet the technical requirements; ③ The twist direction of the line pair does not meet the requirements. If the above problems are existing, the proximal bruises of the twin -twisted wire (referring to the signal interference between the two lines in the UTP), which makes the transmission distance fail to meet the requirements.

The twisting of the twisted wiring has strict standards in production. When actual purchase, some professional equipment can be measured by conditional 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 types, and the five types are more dense than the five categories.

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

This is rarely noticed at this point. Regarding the twisting of the five types of twisted cables and other related parameters, interested readers can consult TIA/EIA568A (TIA/EIA568 is a 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 represented by the letters "B".).