"A" "B" "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

Twisted Pair Cable

TWISTED PAIR. A line consisting of two insulated wires twisted together to form a flexible line without the use of spacers. Different types of cables will vary the wire gauge [AWG] for the inner conductors and there twist, the number of times the wires are twisted per inch. The Braid or shield [outer conductor in the diagram] also varies with different cables by coverage and number of braids. The shield may also be a foil instead of a braid.

twisted-pair cable

Shielded Twisted Pair Cable

Electrical Characteristics to account for; Characteristic Impedance, Attenuation, and Capacitance.

Twisted pair cables may be shielded or un-shielded. The diagram above shows an example of a shielded twisted pair cable [STP]. Twisted pair cables with out a shield are called Unshielded Twisted Pairs [UTP]. By definition a twisted pair cable is a multi-conductor cable, and normally a round cable

Military Standards: MIL-C-17

Interface Bus Standards: EIA-485 is one of many electrical interface buses that required Twisted Pair cables.

Refer here for Manufacturers of Wire and Cable
 
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