Telephone signalling method and apparatus

Details Telephone signalling method and apparatus Telephone signalling method and apparatus

1977-09-08

1979-03-27

Cooper, William C.

179 2A, H04M 1100

Patent

active

041467540

ABSTRACT:
The disclosed signalling apparatus provides a different identifying signal in response to a ringing signal for one or more telephone station sets connected by a common line to a centralized switching, control and signalling machine. The different identifying signals are generated in response to the number and timing of ringing signals applied to the line. If a first ring is sensed and within a predetermined first time a second ring is sensed, a first identifying signal is initiated. If a first ring is sensed and after the predetermined first time but before a predetermined second time a second ring is sensed, a second identifying signal is initiated. If a first ring is sensed, but a second ring is not sensed before the predetermined second time, the signalling apparatus is reset to initial conditions. In the disclosed preferred embodiments of the invention, the second identifying signal may be used to provide a signal to a second telephone connected to the common telephone line, or it may be used to control the operation of a remote appliance.

REFERENCES:
patent: 3702904 (1972-11-01), Bard
patent: 3783193 (1974-01-01), Lee
patent: 3876836 (1975-04-01), Langan

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