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Text File  |  1992-09-02  |  347b  |  10 lines
  1. In communications, a modular,
  2. computer-controlled, digital switching system
  3. used in telephone exchanges. System X was
  4. originally developed by the UK companies GEC,
  5. Plessey, and STC at the request of the Post
  6. Office, beginning 1969. A prototype exchange
  7. was finally commissioned 1978, and the system
  8. launched 1980. STC left the consortium in
  9. 1982.
  10.