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EWSD
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<p>The Elektronisches Wählsystem Digital (EWSD), translated to <i>Electronic Digital Switching System</i> in English, is a widely installed German <a href="/facts/Telephone_exchange/PaRpGm8I">telephone exchange</a> system, originally introduced in 1975 by <a href="/facts/Siemens_AG/coa80TQn">Siemens AG</a>, but discontinued in 2017. </p><p>EWSD can operate as a local end-office switch, a tandem switch, or in a combined configuration for <a href="/facts/Landline/11RD6Nff">landline</a> or mobile telephone service. Siemens claims that EWSD switches perform switching for over 160 million subscriber lines in more than one hundred countries. </p>