In telecommunications, an electronic switching system (ESS) is a telephone switch that uses digital electronics and computerized control to interconnect telephone circuits for the purpose of establishing telephone calls. The generations of telephone switches before the advent of electronic switching in the 1950s used purely electro-mechanical rela...
Found on
http://en.wikipedia.org/wiki/Electronic_Switching_System
(from the article `telephone and telephone system`) Between 1960 and 1962 AT&T conducted a field trial of an electronic switching system (ESS) that employed a variety of new devices and concepts. Among ...
Found on
http://www.britannica.com/eb/a-z/e/20
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