From The Free On-line Dictionary of Computing (19 January 2023): Number 5 Electronic Switching System 5ESS <communications> (5ESS) An electronic circuit switching product sold by Alcatel Lucent (formerly Western Electric/AT&T Network Systems/Lucent Technologies), used by many telephone exchange carriers and service providers. Succeeded the Number 4 Electronic Switching System (4ESS) and reached widespread use in the 1980s. Not to be confused with the Class 5 Switch. (2013-09-14)
Number 5 Electronic Switching System 5ESS
<communications> (5ESS) An electronic circuit switching product sold by Alcatel Lucent (formerly Western Electric/AT&T Network Systems/Lucent Technologies), used by many telephone exchange carriers and service providers. Succeeded the Number 4 Electronic Switching System (4ESS) and reached widespread use in the 1980s.
Not to be confused with the Class 5 Switch.
(2013-09-14)
