Computer controlled key telephone station set

Details Computer controlled key telephone station set Computer controlled key telephone station set

1978-01-17

1980-05-13

Brigance, Gerald

179 99P, H04Q 518

Patent

active

042030110

ABSTRACT:
A key telephone set is disclosed having a programmed digital computer which signals a central switching and control unit of a key telephone system of the status of a plurality of function switches and receives signals from the central switching and control unit that certain electrical connections and visual indicators in the key telephone set are to be initiated or controlled. Two independent audio communication circuits are provided in the key telephone set for interconnection to either the hybrid network of the handset or the built in speakerphone unit. Central office lines are accessed via individual function switches. Intercom calls are initiated via one function switch, and are answered hands-free via the speakerphone or are answered via the hybrid network. A wide range of features are signalled via the function switches and are visually monitored by means of visual indicators. The key telephone set may be used interchangeably with either dial pulse signalling units or tone signalling units.

REFERENCES:
patent: 3843845 (1974-10-01), Ridley
patent: 3935396 (1976-01-01), Barsellotti et al.
patent: 3973085 (1976-08-01), Shiff
patent: 3996424 (1976-12-01), Agricola
patent: 4027110 (1977-05-01), Takematsu
patent: 4046972 (1977-09-01), Huizinga et al.
patent: 4061887 (1977-12-01), Kasson et al.
GTE Automatic Electric Technical Journal, vol. 14, No. 5, pp. 226-234. Jan. 1975 "The Type 17A Key Telephone System". _

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