Stored program control: Difference between revisions

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SPC was introduced in [[electronic switching system]]s in the 1960s. The 101ESS [[Private branch exchange|PBX]] was a transitional switching system in the Bell System to provide expanded services to business customers that were otherwise still served by an electromechanical central office switch, while the Western Electric [[1ESS switch]], British GPO [[TXE]] (various manufacturers), Metaconta 11 (ITT Europe) and the AKE, ARE and pre-digital version(1970s) aversions of the [[AXE telephone exchange]] by [[Ericsson]] were large-scale systems in the [[public switched telephone network]]. SPC enabled sophisticated [[calling feature]]s. As SPC exchanges evolved, reliability and versatility increased. The addition of [[time-division multiplexing]] (TDM) decreased subsystem sizes and dramatically increased the capacity of the telephone network. By the 1980s, SPC technology dominated the telecommunications industry.

==Introduction==