Telephonic communications – Emergency or alarm communications – Central station with plural substations
Patent
1999-01-20
2000-08-15
Chan, Wing F.
Telephonic communications
Emergency or alarm communications
Central station with plural substations
379 40, H04M 1104
Patent
active
061047856
ABSTRACT:
A subscriber control circuit adapted to be incorporated in an united home security system is disclosed. The control circuit includes a plurality of client-side monitor/control servers, each serving to detect and control the situation at the subscriber and connected to a remote administrating and monitoring device via a public telephone network. The remote administrating and monitoring device is capable of transmitting alarm signal to an alarm transmitting network. The client-side monitor/control server also includes a central processing unit, a radio frequency receiver for receiving a detection signal from wireless sensing elements and an encoder for receiving and processing a detection signal from cabled sensing element. A DTMF based receiver connects the central processing unit to the remote administrating and monitoring device to receive a DTMF signal transmitted through the telephone line and transmit the received DTMF signal to the central processing unit. A dialer circuit is coupled to the central processing unit for performing automatic dialing operation.
REFERENCES:
patent: 4361832 (1982-11-01), Cole
patent: 5134644 (1992-07-01), Garton et al.
Chan Wing F.
Tempa Communication Inc.
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