Key telephone system

Details Key telephone system Key telephone system

1987-05-28

1988-11-01

George, Keith E.

Telephonic communications

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

Switching or supervision feature

379156, H04M 300

Patent

active

047825146

ABSTRACT:
A key telephone system comprising a key service unit and key telephone sets is configured by the present invention so that system data are registered in an IC card and the system data so registered are fed to the key service unit by the insertion of the IC card in the key service unit.

REFERENCES:
patent: 3643219 (1972-02-01), Heimann
patent: 3940568 (1976-02-01), Rutkowski et al.
patent: 4136263 (1979-01-01), Williams
patent: 4440986 (1984-04-01), Thorson
patent: 4506346 (1985-03-01), Bennett et al.
patent: 4536621 (1985-08-01), Bergen et al.
patent: 4627046 (1986-12-01), Bellamy
patent: 4703416 (1987-10-01), Crupi et al.
Nirenberg, "Microelectronic Future for Keyphone and PABX Components", Telecommunications, Jun.-1976, pp. 35-38.
Wellenstein, "LSI Yields High Reliability", IEEE Spectrum, Oct. 1979, pp. 78-81.
Terai, "EK-50 Key Telephone System", Japan Telecommunications Review, Jan. 1981, pp.20-23.

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