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Consumer Electronics by S. P. Bali

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PBX SWITCHING

The acronym PBX (or PABX in Europe) stands for private auomatic branch exchange, a device for switching telephone calls within a building such as an office block or factory. The fundamental principles of PBX switching are the same as those found in a much larger central office switch, which is used in the public network to switch telephone traffic from the caller to the person who is being called. The PBX is essentially a connecting device. When a call comes into the PBX from an outside trunk line, it is either routed directly to telephone extension or to a console with a human attendant. The console rings and is answered by an attendant, who then connects the incoming call to the required extension by dialing the extension number ...

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