Digital key telephone system

Details Digital key telephone system Digital key telephone system

1988-08-10

1989-12-12

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 681, H04Q 1104

Patent

active

048872644

ABSTRACT:
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.

REFERENCES:
patent: 4547877 (1985-10-01), Lehman et al.
patent: 4633460 (1986-10-01), Suzuki et al.
patent: 4730303 (1988-03-01), Suzuki et al.

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