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private branch exchange

private branch exchange in Technology

communications
(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).
(1997-06-25)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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