ii. Shielded Twisted Pair (STP)

STP cable has a metal foil or braided-mesh covering that covers each pair of insulated conductors. The metal foil is used to prevent infiltration of electromagnetic noise. This shield also helps to eliminate crosstalk during telephone conversation. STP provides protection against EMI (Electro Magnetic Interference), which UTP doesn’t. Twisted pairs have limited frequency spectrum and thus require repeaters at short distances.