the first transatlantic telephone cable service was opened on september 25, 1956.
the first transatlantic telephone cable service was opened on september 25, 1956.
when was the first transatlantic telephone cable service opened?
september 25 , 1956
tat-1 (transatlantic no. 1) was the first transatlantic telephone cable system. it was laid between gallanach bay, near oban, scotland and clarenville, newfoundland between 1955 and 1956 by the cable ship "monarch". it was inaugurated on september 25, 1956, initially carrying 36 telephone channels. in the first 24 hours of public service there were 588 london–u.s. calls and 119 from london to canada. the capacity of the cable was soon increased to 48 channels. later, an additional three channels were added by use of c carrier equipment. time-assignment speech interpolation (tasi) was implemented on the tat-1 cable in june 1960 and effectively increased the cable's capacity from 37 (out of 51 available channels) to 72 speech circuits. tat-1 was finally retired in 1978. later coaxial cables, installed through the 1970s, used transistors and had higher bandwidth. the moscow–washington hotline was initially connected through this system.
transatlantic communications cable
over the course of its career, it laid or helped lay telecommunications cables all over the world, including tat-1 in 1956, haw-1 (the telephone cable between the continental united states and hawaii) in 1957, the second transatlantic telephone cable tat-2 in 1959, the first canadian transatlantic telephone cable cantat-1 in 1961, the commonwealth pacific cable system (compac) in 1963, and the south atlantic cable sat-1 in 1968.
cs monarch (1945)