Long line (telecommunications)
In telecommunications, a long line is a transmission line in a long-distance communications network such as carrier systems, microwave radio relay links, geosynchronous satellite links, underground cables, aerial cables and open wire, and submarine communications cables.
Microwave networks
In the United States, the term gain visibility through the establishment of AT&T Long Lines division of the Bell System in 1947 when a radio relay between New York and Boston that was made up of seven radio relay stations was inaugurated. The division was subsequently spun out as AT&T Long Distance with the breakup of AT&T in 1984.Though supplanted by fiber-optic networks for long-distance communications, private microwave networks between key stock markets within United States and within Europe gained popularity among high-frequency traders after 2010 as it has significantly lower levels of latency compared with fiber networks.