EWSD

EWSD (Elektronisches Wählsystem Digital in German, Electronic Digital Switching System/Electronic World Switch Digital in English) is one of the most widely installed telephone exchange systems in the world. EWSD can work as a local or tandem switch or combined local/tandem, and for landline or mobile phones. It was originally developed by Siemens AG, who claims that EWSD switches perform switching for over 160 million subscriber lines in more than 100 countries. EWSD (Elektronisches Wählsystem Digital in German, Electronic Digital Switching System/Electronic World Switch Digital in English) is one of the most widely installed telephone exchange systems in the world. EWSD can work as a local or tandem switch or combined local/tandem, and for landline or mobile phones. It was originally developed by Siemens AG, who claims that EWSD switches perform switching for over 160 million subscriber lines in more than 100 countries. As of 2017, the EWSD product line had been discontinued. DeTeWe bought its first EWSD under license in 1985 for remote switching. Bosch built its first EWSD as a local exchange in 1986. Deutsche Telekom, formerly Deutsche Bundespost, the largest German telephone company, uses EWSD and System 12 (Alcatel), the former more than the latter. In 2007, Nokia Corporation and Siemens AG formed a new company Nokia Siemens Networks, and responsibility of further development and shipments of the EWSD system became dependent on the new company. In 2013, after Nokia completed the acquisition of the Siemens stake in the company, Nokia Siemens Networks was rebranded Nokia Solutions and Networks and then, in 2014, Nokia Networks. EWSD was introduced in 1975 as a successor of the Elektronisches Wählsystem (Analog), which was using analogue technology only.