Electronic key telephone system with bi-directional serial data

Details Electronic key telephone system with bi-directional serial data Electronic key telephone system with bi-directional serial data

1979-08-13

1981-09-29

Brigance, Gerald L.

H04Q 518

Patent

active

042924740

ABSTRACT:
An electronic key telephone system which features a bi-directional serial data stream for transmission of control signalling between common control and station circuitry over a single power/data conductor pair independent of the speech conductor pair. The common control central processor includes clock and timing logic circuitry for defining a serial multiphase bit stream of clock and data pulses, each clock pulse initiating a new bit position. Frame intervals are defined by one or more bit positions devoid of both a clock pulse and data information. Common and proprietary data information in the form of unipolar binary signals is multiplexed onto the serial bit stream either at the central processor, at a station circuit, or at the station, and interlaced with clock pulses at predetermined word and bit positions within each frame for communication among the various system circuit elements. Use of the serial data stream transmission scheme simplifies the station electronics such that conventional single line telephone instruments may be configured for use in an electronic key telephone system.

REFERENCES:
patent: 3843845 (1974-10-01), Ridley
patent: 3973085 (1976-08-01), Shiff
patent: 4046972 (1977-09-01), Huizinga et al.
patent: 4061887 (1977-12-01), Kasson et al.
patent: 4088844 (1978-05-01), Kinnaird, Jr.
patent: 4125749 (1978-11-01), Kinoshita et al.
patent: 4160131 (1979-07-01), Kaul et al.

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