See also long line (topology) and long-line fishing.

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In telephone systems nomenclature a long line is a transmission line in a long-distance communications network such as carrier systems, microwave radio links, geosynchronous satellite links, underground cables, aerial cables and open wire, and submarine cables. In the United States, some of this technology was spun-off into the corporate entity known as AT&T Long Distance with the breakup of AT&T.