What are the characteristics of twisted pair cables?

I. What are the characteristics of twisted-pair cable? Twisted-pair cable (TwistedPairwire, TP) is the most commonly used in integrated wiring systems engineering - a transmission medium. Twisted-pair cable is a multi-purpose, easy to install, inexpensive and has good performance characteristics of the cable, it is suitable for the requirements of shielding and do not want to shield the application environment, there are a variety of colors, a variety of line specifications, a variety of insulating materials, different twisted density and a variety of coat materials. Twisted pair can be divided into unshielded twisted pair (Unshielded Twisted Pair, UTP) and shielded twisted pair (ShieldedTwisted Pair, STP). According to the shielding layer material and structure of the different, and can be divided into a variety of models, such as STP, SFTP and FTP shielded twisted-pair symmetrical cable.UTP is no shielding layer structure of the unshielded cable, which has a light weight, small size, good elasticity, ease of use and price is appropriate and so on, so the use of more, and even in the transmission rate of the link is also used. However, it has poor performance against external electromagnetic interference, and its balanced stranding is easily damaged due to pulling and bending during installation, therefore, it cannot satisfy the regulations of EMC (electromagnetic compatibility), in addition, it radiates outwardly when transmitting information, and is easy to leak confidentiality.STP (each pair of core wires and cables are wrapped with aluminum foil, plus copper braided mesh), SFTP (longitudinally wrapped with aluminum foil and added with copper braided mesh), and FTP (longitudinally wrapped with aluminum foil). Pair of stranded symmetrical cables are shielded cables with shielding layer, with the characteristics of preventing external electromagnetic interference and radiation to the outside, but they are heavy weight, large volume, expensive and not easy to construct and other problems, in the construction of the requirements of the complete shielding and correct grounding in order to ensure that the characteristics of the effect.

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