PRX (telephony)

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The PRX205 (PRX/A) is a processor controlled reed relay telephone exchange developed by Philips Telecommunicatie Industrie BV (PTI) in Hilversum during the late 1960s and early 1970s. The first public switch was installed in Overvecht near Amsterdam in 1972. About half of all sales were in the Netherlands.

The PRX digital version (PRX/D) was developed during the early 1980s in PTI's laboratories in Hilversum, Brussels and Malmesbury, Wiltshire but only went into limited production. PTI first went into partnership with AT&T in 1984 and then sold its remaining stake in the company to AT&T (later demerged into Lucent) in 1987. After the takeover, the PRX/D development was stopped in favour of the AT&T 5ESS switch product, but development of PRX/A continued for some time afterwards. PRX/A systems are still in operation worldwide today.

More information can be found at the PRX205 website.