Stored program control: Difference between revisions

Revision as of 00:09, 24 December 2022

Latest revision as of 14:06, 17 January 2023

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}}</ref> The world’s first electronic switching system for production use, the [[No.1 ESS]], was commissioned by AT&T at [[Succasunna, New Jersey]], in May 1965. By 1974, AT&T had installed 475 No. 1ESS systems. In the 1980s SPC displaced electromechanical switching in the telecommunication industry, hence the term lost all but historical interest. Today, SPC is aan integral concept in all automatic exchanges, due to the universal application of computers and microprocessor technology.

The attempts to replace the electromechanical switching matrices by semiconductor cross-point switches were not immediately successful, particularly for large-scale exchange systems. As a result, many space-division switching systems used electromechanical switching networks with SPC, while private automatic branch exchanges (PABX) and smaller public exchanges used electronic switching devices. Electromechanical matrices were replaced in the early 21st century by fully electronic devices.