Stored program control: Difference between revisions

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'''Stored program control''' (SPC) iswas a telecommunications technology used for [[telephone exchanges]] controlled by a computer program stored in the memory of the switching system. SPC was the enabling technology of [[electronic switching system]]s (ESS) developed in the [[Bell System]] in the 1950s and could be considered the third generation of switching technology.

Second generation exchanges such as [[Strowger switch|Strowger]], [[Panel switch|panel]], rotary, and [[Crossbar switch|crossbar]] switches were constructed purely from electromechanical switching components with analog control electronics, and had no computer software control. Stored program control was invented by [[Bell Labs]] scientist [[Erna Schneider Hoover]] in 1954 who reasoned that computer software could control the connection of telephone calls.<ref name=tws2Q312>{{cite news