PBX
Abbreviation for private branch exchange. 1. A subscriber-owned telecommunications exchange that usually includes access to the public switched network. 2. A switch that serves a selected group of users and that is subordinate to a switch at a higher level military establishment. 3. A private telephone switchboard that provides on-premises dial service and may provide connections to local and trunked communications networks. Note 1- A PBX operates with only a manual switchboard; a private automatic exchange (PAX) does not have a switchboard, a private automatic branch exchange (PABX) may or may not have a switchboard. Note 2- Use of the term “PBX” is far more common than “PABX,” regardless of automation.
PBX tie trunk
See tie trunk.
PBX trunk
See trunk.
private branch exchange (PBX)
See PBX.
satellite PBX
A PBX system that is not equipped with attendant positions, and is associated with an attended main PBX system. Note- The main attendant provides attendant functions for the satellite system.
