ALL meanings of private branch exchange
- noun Technical meaning of private branch exchange (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). 1
- noun private branch exchange a telephone system that handles the internal and external calls of a building, firm, etc 0
- noun private branch exchange (Idiomatic) A telecommunications switching system, physically located at a customer's place of business, that provides internal communication between users and also access to outside (trunk) telephone lines. 0