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Early-1970s Telephone Exchange model TESLA Automatic system Early model 464G Western Electric key telephone set. A business telephone system is a telephone system typically used in business environments, encompassing the range of technology from the key telephone system (KTS) to the private branch exchange (PBX).
The IBM 1750, 2750 and 3750 Switching Systems were telephone exchange systems produced by IBM from the 1960s to the 1990s.. IBM engineers in the IBM La Gaude Research Laboratory, north-west of Nice in France, developed an electronic Private Automatic Branch Exchange: the first stored-program-controlled PABX to be marketed and installed in the world.
Automation replaced human operators with electromechanical systems, and telephones were equipped with a dial by which a caller transmitted the destination telephone number to the automatic switching system. A telephone exchange automatically senses an off-hook condition of the telephone when the user removes the handset from the switchhook or ...
The system was designed at the beginning of the 1980s prior to the Bell System breakup as a modern electronic replacement for the dated electromechanical 1A2 Key System. Earlier Bell attempts at an electronic key system, such as Horizon and Dimension, were not as successful as were the much larger systems; in fact, Dimension was a PBX. The ...
Stromberg-Carlson produced several unique switching systems, including: XY, a "flat motion" switch logically similar to Strowger switching.The "XY Selector" was not invented by SC, but licensed from L.M. Ericsson of Sweden in the late 1940s and re-engineered for U.S. switching applications (Ericsson used it for PABX and a very small Rural Exchange application).
The standard defines two sides of the interface, the trunk circuit and the signaling unit. The trunk circuit is normally the side to which the PABX is connected. The signaling unit is the special modem that converts the DC signaling protocol into tones that could be transmitted over a four-wire link back to the PTT exchange.
Proposed and developed in the 1950s, SPC was introduced in production electronic switching systems in the 1960s. The 101ESS private branch exchange (PBX) was a transitional switching system in the Bell System to provide expanded services to business customers that were otherwise still served by an electromechanical central office switch.
3CX, Inc., is a software development company and developer of the 3CX Phone System. The 3CX Phone System is a software private branch exchange based on the SIP (Session Initiation Protocol) standard to allow calls via the public switched telephone network (PSTN) or via Voice over Internet Protocol (VoIP) services.