Time synchronized data transmission system

Details Time synchronized data transmission system Time synchronized data transmission system

1982-12-14

1984-09-04

George, Keith E.

179 2AM, H04M 1108

Patent

active

044699174

ABSTRACT:
A time synchronized data transmission system which allows a computer to access a remote data set via a non-dedicated telephone line is disclosed. The system is coupled to a telephone instrument, a data set and the telephone transmission line. The system disconnects the telephone instrument from the transmission line during predetermined time intervals. During these time intervals, a computer can communicate with the data set via the telephone line without ringing the telephone instrument. In the event the user wishes to use the telephone instrument during the predetermined time intervals when the telephone instrument is disconnected, a subscriber priority circuit allows the user to recouple the instrument to the line by merely lifting the telephone handset.

REFERENCES:
patent: 4104486 (1978-08-01), Martin et al.
patent: 4126762 (1978-11-01), Martin et al.
patent: 4345113 (1982-08-01), Shelley
patent: 4394540 (1983-07-01), Willis et al.
patent: 4438295 (1984-03-01), Hales
James Guilder, "Telephone Accessory: Turn-On Appliances Via Long Distance", Radio Electronics, vol. 48, No. 4, Apr. 1977, pp. 39-42 & 95.

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