The local loop ..........................cable that connects the subscriber tele-phone to the nearest end office.
The local loop Twisted pair cable that connects the subscriber tele-phone to the nearest end office.
Twisted pair is the ordinary copper wire that connects home and many business computers to the telephone company. To reduce crosstalk or electromagnetic induction between pairs of wires, two insulated copper wires are twisted around each other.
The use of two wires twisted together helps to reduce crosstalk and electromagnetic induction. While twisted-pair cable is used by older telephone networks and is the least expensive type of local-area network (LAN) cable, most networks contain some twisted-pair cabling at some point along the network.
Twisting the cables is done to remove the electromagnetic interference from the wires. When a signal is transmitted through the cable it is in the form of current. This flow of current produces a electromagnetic field of interference around it and can generate noise effects in the surrounding cables.
Crosstalk between wires is cancelled when an interfering signal is applied equally to both sides of a twisted-pair wire. Twisted-pair wiring can also be wrapped with a shielding conductor sheath, which acts as an electrostatic shield.