Audible tone which alerts TSPS operator of a new call. 440 Hz 5 ms.
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The Traffic Service Position System (TSPS) was developed by Bell Labs in Columbus, Ohio to replace traditional cord switchboards. The first TSPS was deployed in Morristown, New Jersey in 1969 and used the Stored Program Control-1A CPU, "Piggyback" twistor memory (a proprietary technology developed by Bell Labs similar to core memory) and Insulated Gate Field Effect Transistor solid state memory devices similar to dynamic random access memory.[1]
^Jaeger, R.J. Jr. (December 10, 1970). "TSPS No.1: System Organization and Objectives". Bell System Technical Journal. 49 (49): 2417–2443. Retrieved 26 February 2022.
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