Through the years the AX Crossbar (1972-1978), the EX Solid State (1978-1983), the DX Space Switch (1983-1987) and the HCX Time Division Multiplex (1987-2004) PBX systems were installed throughout the USA, taking the lion's share of the Hospitality market.
These systems were designed exclusively for the Hospitality market and provided a great cost reduction solution compared to Western Electric systems provided by the Bell companies.
In the mid 1970's, Hitachi Telecom began producing quality PBX systems for use in the Hospitality (USA) market.
