Apparatus for automatically sending data over a telephone system

Details Apparatus for automatically sending data over a telephone system Apparatus for automatically sending data over a telephone system

1975-05-19

1976-10-19

Claffy, Kathleen H.

179 5R, H04M 1104

Patent

active

039872467

ABSTRACT:
The apparatus disclosed is for use with conventional automatic dialing telephone equipment and includes a master or central station and a remote, automatically triggered, dialing station. The remote station is triggered by an alarm device of no particular interest to the present invention, such as one to indicate an intruder or a fire. The remote station, once triggered, electronically dials the assigned sequence of numbers by forming the necessary make and break signals for the conventional telephone equipment found at the telephone exchange to connect the remote station to the central station through the telephone system. When the connection is completed, the central station sends a tone pulse to the remote station to verify the completion of the connection. The remote station then transmits data to the central station by spaced tone pulses. Simultaneously with the receipt of each tone pulse, the central station sends a tone pulse to the remote station of a preselected amplitude and frequency having the same duration as the tone pulse from the remote station to verify receipt of the tone pulse. If the remote station fails to receive such a verification pulse, the connection is broken and the cycle of dialing and sending data is repeated.

REFERENCES:
patent: 3131376 (1964-04-01), DuVall
patent: 3233232 (1966-02-01), Brennon
patent: 3582555 (1971-06-01), Kok
patent: 3626098 (1971-12-01), Lee
patent: 3800091 (1974-03-01), Glidden et al.
patent: 3801743 (1974-04-01), Westbeck
patent: 3842208 (1974-10-01), Paraskevakos
patent: 3866206 (1975-02-01), DeGiorgio et al.
patent: 3883695 (1975-05-01), Bickel et al.

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