Remote subscriber interaction system

Details Remote subscriber interaction system Remote subscriber interaction system

H - Electricity

04

M

379/5

H04M 11/04 (2006.01) H04M 11/00 (2006.01)

Patent

CA 1230692

ABSTRACT OF THE DISCLOSURE: 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 subscribers loop. To each STU are connected the various instrumentalities which are to be monitored by the system, e.g. fire alarms, burglar alarms, etc. A signal below the audible range (low tone) is produced at the STU, and transmitted to the scanner over the telephone loop if, but only if, all the instrumentalities at the particular subscriber premises are in a given state (e.g. non-alarm). If not, low tone is stopped. Such stoppage is sensed by the scanner, and causes immediate transmission of FSK modulated signals in the upper part of the audible range from the scanner to the corresponding STU, whether the associated telephone is on-hook or off-hook at the time. The reply from the STU to such transmission provides information about the reason for the stoppage, i.e. what is the source of the alarm.

476340

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