Key telephone system with distributed control

Details Key telephone system with distributed control Key telephone system with distributed control

1984-09-21

1987-01-20

Dwyer, James L.

Telephonic communications

Multi-line or key substation system with selective switching...

With intercom system

379163, 379164, H04M 906

Patent

active

046381244

ABSTRACT:
A system is presented for accessing a plurality of central office lines, PBX, etc. by a plurality of stations and for exchanging signals between the stations. Each station is provided with a self-sufficient microprocessor which controls all the functions of the station. The microprocessors exchange control signals to indicate the status of each station and each line. A common intercom line is provided for both audio signals and control signals. Each station is assigned a unique address so that each station is able to dial up another station for intercom communication by generating the proper control signals.
Each station is also provided with a switch matrix for selectively accessing any of the lines, line status indicating means, and line holding means which is automatically released when any station accesses the held line.

REFERENCES:
patent: 4188511 (1980-02-01), Smith et al.
patent: 4298775 (1981-11-01), Buck et al.
patent: 4329543 (1982-05-01), Danford
patent: 4351987 (1982-09-01), Feil
patent: 4382163 (1983-05-01), White et al.
patent: 4383137 (1983-05-01), Aikawa et al.
patent: 4387274 (1983-06-01), Stein et al.
patent: 4401847 (1983-08-01), Schneider et al.
patent: 4408102 (1983-10-01), Lumpkin
patent: 4453040 (1984-06-01), Wolf et al.
patent: 4490583 (1984-12-01), Bednarz et al.
patent: 4511766 (1985-04-01), Shah

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