- PRX (telephony)
The PRX205 (PRX/A) is a processor controlled
reed relay telephone exchange developed byPhilips Telecommunicatie Industrie BV (PTI) inHilversum during the late 1960s and early 1970s. The first public switch was installed in Overvecht nearAmsterdam 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 andMalmesbury, Wiltshire but only went into limited production. PTI first went into partnership withAT&T in 1984 and then sold its remaining stake in the company to AT&T (later demerged intoLucent ) in 1987. After the takeover, the PRX/D development was stopped in favour of the AT&T5ESS switch product, but development of PRX/A continued for some time afterwards. PRX/A systems are still in operation worldwide today.External links
* [http://www.prx205.org/ PRX205 website] .
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