• private branch exchange

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Private branch exchange

1 A 'private branch exchange (PBX)' is a telephone exchange that serves a

particular business or office, as opposed to one that a common carrier or telephone company

operates for many businesses or for the general public. PBXs are also

referred to as:

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Private branch exchange - Key system

1 Key systems are primarily defined by individual line selection buttons for

each connected phone line, a feature shared with hybrid systems. New installations of key systems have become less common, as hybrid

systems and private branch exchanges of comparable size have

similar cost and greater functionality.https://store.theartofservice.com/the-private-branch-exchange-toolkit.html

PABX - Private branch exchange

1 A 'private branch exchange (PBX)' is a telephone exchange or switching system that serves a

private organization and performs concentration of central office lines or trunks and provides

intercommunication between a large number of telephone stations in the organization.ATT, Notes

on the Network (1980) p.3 The central office lines provide connections to the public switched telephone network and the concentration aspect

of a PBX permits the shared use of these lines between all stations in the organization

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