Electronic Switching System
In telecommunications, an electronic switching system (ESS) is:
- A telephone exchange based on the principles of time-division multiplexing of digitized analog signals. An electronic switching system digitizes analog signals from subscriber loops, and assigns them to appropriate time slots. It may also interconnect digital data or voice circuits.
- A switching system with major devices constructed of semiconductor components. A semi-electronic switching system using reed relays or crossbar matrices for its talk paths, as well as semiconductor devicees in common control, was also considered to be an ESS in the 20th century. 1ESS switch was a prominent example.
In the late 20th century most telephone exchanges were eliminated that were not time-division ones, so interest in this distinction became primarily historical. When the term is still used, it means approximately the same as Stored Program Control exchange.
See also 
- This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).
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