System X is the system used to run the UK narrowband communications network. Designed by the GPO and GEC in the 1970s (the first exchange was rolled out in 1979) System X is the umbrella term covering both hardware and software sitting in the exchanges (both local exchanges and trunk exchanges), that is responsible for setting up calls,billing them, and clearing the connections away.

System X has undergone many permutations, including adaptions to deal with cable telcos, and uncreased processing and switching power, mainly to deal with the hugely increased demand to call time, largely due to the popularity of the Internet (when System X was designed average call time was 2 minutes, it is currently 14 minutes, with a longest call record of 40hrs)

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