Time independent data transmission system having capability for

Telephonic communications – Telephone line or system combined with diverse electrical... – Remote indication over telephone line

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Details

379107, H04M 1100

Patent

active

046548688

ABSTRACT:
A time independent data transmission system which allows a computer to access a selected one of a plurality of data devices at a location remote from the computer at any time via a non-dedicated telephone line is disclosed. The system is coupled to a telephone instrument, the plurality of data devices and the telephone transmission line and normally connects a data set coupled to the data devices to the telephone transmission line. The telephone instrument is normally disconnected. A counting circuit senses the number of ring bursts in a ringing signal from a caller and a central computer is programmed to transmit a ringing signal having only one ring burst. When only one ring burst is sensed, the data set remains connected to the telephone transmission line and the data set dials up the central computer when the ringing signal terminates. The data set comprises a decoder circuit which receives a coded signal from the central computer designating which of the data devices is to be accessed. The decoder controls a switch to select one of the data devices. If more than one ring burst occurs, a non-computer call is being sensed and the data set is disconnected and the telephone connected to the telephone transmission line so that normal telephone usage is allowed. Communication between the computer and the data set via the telephone line occurs without ringing the telephone instrument and without otherwise interfering with normal telephone usage.

REFERENCES:
patent: 4180709 (1979-12-01), Cosgrove et al.
patent: 4504831 (1985-03-01), Jahr et al.

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