Telephone including resistive array for dialing and system for u

Details Telephone including resistive array for dialing and system for u Telephone including resistive array for dialing and system for u

1982-12-27

1985-06-11

George, Keith E.

179 90K, 179 99R, H04M 172

Patent

active

045230560

ABSTRACT:
A system for providing telephone service to a subscriber. The system has at least one unconventional telephone and at least one master or interface unit which is electrically connected between the telephone and the central office. The operation of the telephone hook switch in combination with the operation of the dialing information entering means on the telephone provides changes in the impedance of the telephone. The master unit responds to these impedance changes to generate signals interpretable as dialing to the central office. When the telephone is on-hook the master unit responds to ringing from the C.O. and converts that signal to a signal which is used by the telephone to alert the subscriber.

REFERENCES:
patent: 3665112 (1972-05-01), Blake et al.
patent: 3790813 (1974-02-01), Ennis
patent: 4088846 (1978-05-01), McEowen
patent: 4097690 (1978-06-01), Kuntz et al.
patent: 4196317 (1980-04-01), Bartelink
patent: 4412209 (1983-10-01), Frame et al.
patent: 4459434 (1984-07-01), Benning et al.

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