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private branch exchange

private branch exchange in Technology

(PBX) A telephone exchange local to a particular organisation who use, rather than provide, telephone services. The earliest PBXs were manual (Private Manual Branch EXchange, PMBX) but are now more likely to be automatic (Private Automatic Branch eXchange).

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Examples from the Web for private branch exchange
Historical Examples
  • There was a private branch exchange there, and Alice knew the girl operator.

    The Moving Picture Girls Laura Lee Hope
  • It was the period of the message rate, the pay station, the farm line, and the private branch exchange.

    The History of the Telephone Herbert N. Casson

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