Stored Program Control exchange

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Stored Program Control exchange (SPC) is the technical name used for telephone exchanges controlled by a program stored in the memory of the system. Early exchanges such as Strowger, Panel, Rotary, and Crossbar were electro mechanical and had no software control. SPC was introduced on a small scale in so called Electronic switching systems in the 1960s, and on a large scale (1ESS switch for example) in the 1970s. SPC allowed more sophisticated Calling features. In the 1980s it completely took over the industry. As SPC exchanges evolved, reliability and versatility increased.

[edit] See also

List of telephone switches

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