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Possible Answers:
ESS.
Last seen on: NY Times Crossword 30 Jun 19, Sunday
Random information on the term “ESS”:
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 relay systems and analog voice paths. These early machines typically utilized the step-by-step technique. The first generation of electronic switching systems in the 1960s were not entirely digital in nature, but used reed relay-operated metallic paths or crossbar switches operated by stored program control (SPC) systems.
First announced in 1955, the first customer trial installation of an all-electronic central office commenced in Morris, Illinois in November 1960 by Bell Laboratories. The first prominent large-scale electronic switching system was the Number One Electronic Switching System (1ESS) of the Bell System in the United States in New Jersey during May 1965.