Digital key telephone system

Details Digital key telephone system Digital key telephone system

H - Electricity

04

Q

344/13

H04Q 3/58 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 1296413

ABSTRACT OF THE DISCLOSURE In a digital key telephone system through which extension-to-extension calls can be made and incoming calls can be transferred between a master main installation and plural slave main installations, the master and slave main installations are interconnected through digital interface units provided for each installation in order to transmit and receive speech data and control data in digital code between the installations. The digital interface unit of the master main installation first designates an address of the slave main installation to which data are to be transmitted before data transmission, while the digital interface unit of the slave main installation receives data transmitted from the master main installation after address designation. Further, the addresses of the slave main installations can be designated together or separately.

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