Number 5 Electronic Switching System


(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.

Last updated: 2013-09-14

Nearby terms:

NUMANumber 5 Electronic Switching Systemnumber crunchingnumber keys

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