Security system with backup dialer
First Claim
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1. Security apparatus comprising:
- a first control and communications unit adapted to monitor a system and to establish communications over a connected telephone line and to transmit an alarm upon the occurance of a predetermined event in the system, said first control and communications unit having means for producing a characteristic signal when the first control and communications unit is operational; and
a second control and communications unit adapted to monitor the characteristic signal produced by said first control and communications unit and to establish communications over said connected telephone line and transmit an alarm upon interruption of said characteristic signal.
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Abstract
A security apparatus having two control and communications units adapted to monitor a system and to establish communications over a connected telephone line and to transmit an alarm upon the occurance of a predetermined event in the system. The first control and communications unit produces a characteristic signal when it is operational; and the second control and communications unit is adapted to monitor the characteristic signal produced by the first control and communications unit and to establish communications over the connected telephone line and transmit an alarm upon interruption of the characteristic signal. The characteristic signal is preferably a tone of predetermined frequency.
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Citations
9 Claims
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1. Security apparatus comprising:
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a first control and communications unit adapted to monitor a system and to establish communications over a connected telephone line and to transmit an alarm upon the occurance of a predetermined event in the system, said first control and communications unit having means for producing a characteristic signal when the first control and communications unit is operational; and a second control and communications unit adapted to monitor the characteristic signal produced by said first control and communications unit and to establish communications over said connected telephone line and transmit an alarm upon interruption of said characteristic signal. - View Dependent Claims (2, 3, 4, 5)
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6. Security apparatus comprising:
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a first control and communications unit adapted to monitor a system and to establish communications over a connected telephone line and to transmit an alarm upon the occurance of a predetermined event in the system, said first control and communications unit having means for producing a first characteristic signal when the first control and communications unit is operational; a second control and communications unit adapted to monitor the first characteristic signal and to establish communications over the connected telephone line and transmit an alarm upon interruption of said first characteristic signal, said second control and communications unit having means for producing a second characteristic signal when the second control and communications unit is operational; and means, associated with said first control and communications unit for monitoring the second characteristic signal and to establish communications over the connected telephone line and transmit an alarm upon interruption of said second characteristic signal. - View Dependent Claims (7, 8)
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9. A method for detecting an alarm condition and for transmitting an alarm signal over a telephone line, said method comprising the steps of:
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establishing communications over a connected telephone line with communication circuitry; monitoring a system while producing a characteristic signal over the connected telephone line; transmitting an alarm over the connected telephone line upon the occurance of a predetermined event in the system; interrupting the production of the characteristic signal over the connected telephone line when communication over the connected telephone line is interrupted; and monitoring the characteristic signal on the connected telephone line and establishing communications over the connected telephone line and transmitting an alarm upon interruption of said characteristic signal.
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Specification