Difference Between Shielded Twisted Pair and Unshielded Twisted Pair

The twisted pair is divided into a shielded twisted pair (Shielded Twisted Pair, STP) and an unshielded twisted pair (Unshielded Twisted Pair, UTP). Shielded twisted pair has a metal shield between the twisted pair and the outer insulating jacket. 
The shielding layer can reduce radiation, prevent information from being eavesdropped, and prevent the entry of external electromagnetic interference, so that the shielded twisted pair has a higher transmission rate than the similar unshielded twisted pair . Unshielded Twisted Pair (UTP for short) is a data transmission line consisting of four pairs of transmission lines of different colors, widely used in Ethernet and telephone lines. Unshielded twisted pair cable was first used in Bell 's invention of the telephone system in 1881. The telephone network in the United States in 1900 also consisted mainly of UTP, which was owned by the telephone company.