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A telecommunication circuit is defined as follows: Source: from Federal Standard 1037C and from MIL-STD-188 ---- In telecommunications, a '''tele'''communication'''s''' circuit is any line or circuit on which information is transmitted. A dedicated circuit, private circuit, or leased line is a line that is dedicated to only one use. Originally, this was analog, and was often used by radio stations as a studio/transmitter link (STL) or remote pickup unit (RPU) for their audio, sometimes as a backup to other means. Later lines were digital, and used for private corporate data networks. The opposite of a dedicated circuit is a switched circuit, which can be connected to different paths. A POTS or ISDN telephone line is a switched circuit, because it can connect to any other telephone number. On digital lines, a virtual circuit can be created to serve either purpose, while sharing a single physical circuit.
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