Classification of twisted pair(1)
Update:Dec 08,2021
Summary:Classified according to whether there is a shielding layerAccording to whether there is a shielding layer, twisted pair is divided into shielded twist...
Classified according to whether there is a shielding layer
According to whether there is a shielding layer, twisted pair is divided into shielded twisted pair (STP) and unshielded twisted pair (UTP).
The shielded twisted pair has a metal shield between the twisted pair and the outer insulating sheath. Shielded twisted pair cables are divided into STP and FTP (Foil Twisted-Pair). STP means that each line has its own shielding layer, while FTP only works when the entire cable has a shielding device and both ends are correctly grounded. Therefore, the entire system is required to be shielded devices, including cables, information points, crystal heads and distribution frames, etc. At the same time, the building needs to have a good grounding system. The shielding layer can reduce radiation, prevent information from being eavesdropped on, and can also prevent the entry of external electromagnetic interference, so that the shielded twisted pair has a higher transmission rate than the similar unshielded twisted pair. However, in actual construction, it is difficult to perfectly ground all of them, so that the shielding layer itself becomes the largest source of interference, resulting in performance that is far inferior to unshielded twisted pair cables. Therefore, unless there are special needs, usually only unshielded twisted pairs are used in the integrated wiring system.
Unshielded twisted pair (abbreviated as UTP) is a data transmission line composed of four pairs of transmission lines of different colors, which are widely used in Ethernet and telephone lines.
Unshielded twisted pair cable has the following advantages:
1. No shielding jacket, small diameter, saving occupied space and low cost;
2. Light weight, easy to bend and easy to install;
3. Minimize or eliminate crosstalk;
4. Has flame retardancy;
5. With independence and flexibility, it is suitable for structured integrated wiring. Therefore, unshielded twisted pair cables are widely used in integrated wiring systems.
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