H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/8
H04M 11/04 (2006.01) H04M 11/00 (2006.01)
Patent
CA 1285669
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 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 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 stoppage, i.e. what is the source of the alarm. 2209b/27
399926
Chebra Ronald J.
James Rolland T.
Blake Cassels & Graydon Llp
Bronzebase Limited
LandOfFree
Remote subscriber interaction system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Remote subscriber interaction system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Remote subscriber interaction system will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1193780