Twisted pair cable is just what its name implies; insulated wires housed within a protective casing with a specified number of twist per foot of distance. Twisting of wires reduces the effect of electromagnetic interface which may be generated from nearby electric motors, florescent tube lights etc. Shielded Twisted-Pair(STP) cables are provided with shielding and additional insultation over the cluster of wires to protect it from outside noise. Unsheilded twisted-pair (UTP) cables are mostly used in small office or home LANs which are less costly.
The unshielded twisted-pairs are classified by the by the Electronic Industries Association (EIA) into seven categories of UTP cables.
The most common UTP connector is RJ 45,which can be interested in one way only.
Applications:: Twisted-pair cables are extensively used in telephone lines as voice and data channels. The lines connecting subscribers to the telephone exchange are unshielded twisted-pair cables.
People use twisted-pair cables to connect DSL lines for high speed Internet Connection.
LAN such as 10 Base-T and 100 Base_T uses twisted pair cables.
Low Cost: the cost of twisted-pair is not so high.
Light weight: Twisted-pair cables are lighter in weight. Hence it dose not require heavy support.
Easy Installation & maintenance: The technology of twisted-pair cable laying is a job of almost any person. Connecting the RJ$% connector to the cable is called crimping and it requires a few hours of practice.
Cheaper equipment: Crimping tools and other tools necessary for twisted-pair cable preparation are cheap. Hence these are easy to purchase.
Subceptible to cross talk: Twisted-pair cables are not totally immune to cross talk.
Distance limitation: The maximum length of LAN using twisted-pair cable is short, in comparison to optical fiber.