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Traffic Service Position System
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{{Listen |filename=Zip tone.ogg |title=Zip tone |description=Audible tone which alerts TSPS operator of a new call. 440 Hz 5 ms. }} The '''Traffic Service Position System''' ('''TSPS''') was developed by [[Bell Labs]] in [[Columbus, Ohio]] to replace traditional cord [[Telephone switchboard|switchboard]]s. The first TSPS was deployed in [[Morristown, New Jersey]] in 1969 and used the [[Stored Program Control exchange|Stored Program Control]]-1A CPU, "Piggyback" [[twistor memory]] (a proprietary technology developed by [[Bell Labs]] similar to core memory) and [[IGFET|Insulated Gate Field Effect Transistor]] solid state memory devices similar to [[DRAM|dynamic random access memory]].<ref name="BSTJ 49">{{cite journal |last1=Jaeger |first1=R.J. Jr. |title=TSPS No.1: System Organization and Objectives |journal=Bell System Technical Journal |date=December 10, 1970 |volume=49 |issue=49 |pages=2417β2443 |url=https://archive.org/details/bstj49-10-2417/page/n7/mode/2up |access-date=26 February 2022 |ref=BSTJ 49}}</ref>
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