Remote subscriber interaction system

Details Remote subscriber interaction system Remote subscriber interaction system

1985-12-13

1988-04-26

George, Keith E.

Telephonic communications

Telephone line or system combined with diverse electrical...

Remote indication over telephone line

379 39, 379 49, 379 50, H04M 1104

Patent

active

047410221

ABSTRACT:
A central control unit (scanner) is connected across a set of subscriber loops. At each subscriber's premises, an individual subscriber terminal unit (STU) is connected across that particular subscriber's loop. To each STU are connected the various instrumentalities which are to be monitored by the system, e.g. fire alarms, burglar alarms, etc. FSK modulated signals in the upper part of the audible range are transmitted from the scanner to the STUs at appropriate times. The STUs reply by means of similar signals to indicate the status (e.g. alarm, or non-alarm) of the instrumentalities at the respective subscriber premises. This transmission and retransmission is interrupted when the subscriber's telephone is off-hook. In addition, a signal below the audible range (low tone) is produced at the STU, and transmitted to the scanner over the telephone loop when all the instrumentalities at the particular subscriber premises are in a given state (e.g. non-alarm). When the state of one instrumentality changes, low tone is stopped. Such stoppage is sensed by the scanner, and causes immediate transmission of the FSK signals from the scanner to the corresponding STU, even though the associated telephone is off-hook at the time. The reply to such transmission provides information about the reason for the stoppage, i.e. what is the source of the alarm.

REFERENCES:
patent: 3700823 (1972-10-01), Chulak
patent: 4442320 (1984-04-01), James et al.
patent: 4521643 (1985-06-01), Dupuis et al.

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