EWSD
German telephone exchange system / From Wikipedia, the free encyclopedia
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The Elektronisches Wählsystem Digital (EWSD), translated to Electronic Digital Switching System in English, is a widely installed German telephone exchange system, originally introduced in 1975 by Siemens AG, but discontinued in 2017.[1]
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EWSD can operate as a local end-office switch, a tandem switch, or in a combined configuration for landline or mobile telephone service. Siemens claims that EWSD switches perform switching for over 160 million subscriber lines in more than one hundred countries.