Private Branch Exchange - meaning and definition. What is Private Branch Exchange
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What (who) is Private Branch Exchange - definition

MULTILINE TELEPHONE SYSTEM TYPICALLY USED IN BUSINESS ENVIRONMENTS
Private branch exchange; PABX; Hosted pbx; Follow-me; Key System Unit; Key phone system; Key system unit; Private Branch eXchange; Private Automated Branch eXchange; Private business exchange; EPABX; Digital PABX; Digital pabx; Digital PBX; Digital pbx; Key Telephone System; Key service unit; Private Branch Exchange; Business communications system; PBX/IPBX; Key Telephone Unit; Key telephone system; Hpbx; Mpbx; Hosted PBX; Virtual PBX; Direct Inward Systems Access; PABX features; Hosted PBX systems; Hosted PBX system; Virtual PBX systems; Virtual PBX system; Phone system
  • TESLA]] Automatic system
  • A 1930s key telephone for a private branch exchange.
  • An Avaya G3si PBX with front cover removed (view from the top)
  • Racks of a Strowger telephone exchange from 1989, showing two-motion selectors in the United Kingdom.

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). (1997-06-25)
PABX         
¦ abbreviation private automatic branch exchange.
PABX         
Private Automatic Branch eXchange

Wikipedia

Business telephone system

A business telephone system is a multiline telephone system typically used in business environments, encompassing systems ranging in technology from the key telephone system (KTS) to the private branch exchange (PBX).

A business telephone system differs from an installation of several telephones with multiple central office (CO) lines in that the CO lines used are directly controllable in key telephone systems from multiple telephone stations, and that such a system often provides additional features related to call handling. Business telephone systems are often broadly classified into key telephone systems, and private branch exchanges, but many hybrid systems exist.

A key telephone system was originally distinguished from a private branch exchange in that it did not require an operator or attendant at the switchboard to establish connections between the central office trunks and stations, or between stations. Technologically, private branch exchanges share lineage with central office telephone systems, and in larger or more complex systems, may rival a central office system in capacity and features. With a key telephone system, a station user could control the connections directly using line buttons, which indicated the status of lines with built-in lamps.