Development
System X was developed by the UK Post Office (later to become British Telecom), GEC, Plessey, and Standard Telephones and Cables (STC) and first shown in public in 1979 at the Telecom 79 exhibition in Geneva Switzerland. In 1982, STC withdrew from System X and, in 1988, the telecommunications divisions of GEC & Plessey merged to form GPT, with Plessey subsequently being bought out by GEC & Siemens. In the late 1990s, GEC acquired Siemens' 40% stake in GPT and, in 1999, the parent company of GPT, GEC, renamed itself Marconi.
When Marconi was sold to Ericsson in January 2006, telent plc retained System X and continues to support and develop it as part of its UK services business.
Read more about this topic: System X (telephony), History
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