System X (telephony)
System X was the name of the UK's first national digital telephone exchange system. It was developed by the UK Post Office (later to become British Telecom), GEC, Plessey, and STC, and first shown in public in 1979. The first System X digital exchange started operation in 1979 in Woodbridge (near Martelsham, BT Research HQ). The last electromechanical trunk exchange (in Thurso, Scotland) was closed in July 1990 - completing the UK's transition to purely digital operation, and becoming the first national telephone system to achieve this.
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