Inexpensive, multiple-conductor prised of one or more pairs of 18 to 24 gauge copper strands. The strands are twisted to improve protection against ic and radio frequency interference. The cable, which may be either shielded? or unshielded, is used in low-munications, as telephone cable. It is used only in works because of its narrow bandwidth. Most telephone lines you see strung on poles consist of cables made up of hundreds of copper wires are twisted pairs. Twisted pairs are susceptible to a variety of types of electrical interference (noise), which limits the practical distance that data can be transmitted without being garbled. Twisted pairs have been used for years for voice and data transmission, however they are now being phased out by more technically advanced and reliable media.
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