Monitored security switch assembly
First Claim
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1. A monitored security switch assembly, comprising:
- a switching system including a first impedance, the switching system responsive to a security condition of an object to be protected to switchably alter the value of the first impedance;
a transmission line, the switching system being impedance matched with the transmission line; and
a monitoring system which provides at least one oscillatory voltage to the switching system through the transmission line, the monitoring system detecting an impedance mismatch between the switching system and the transmission line due to the security condition, or tampering or cutting of the transmission line.
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Abstract
A monitored security switch assembly includes a switching system, a transmission line, and a monitoring system. The switching system has a load element. The security switch assembly uses an oscillatory voltage to determine if the monitoring system, the switching system and the transmission line are impedance matched. The security switch system can function in a transmission mode or a reflection mode.
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Citations
30 Claims
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1. A monitored security switch assembly, comprising:
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a switching system including a first impedance, the switching system responsive to a security condition of an object to be protected to switchably alter the value of the first impedance; a transmission line, the switching system being impedance matched with the transmission line; and a monitoring system which provides at least one oscillatory voltage to the switching system through the transmission line, the monitoring system detecting an impedance mismatch between the switching system and the transmission line due to the security condition, or tampering or cutting of the transmission line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A monitored security switch assembly, comprising:
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a transmission line; a switching system coupled to the transmission line and including an oscillator which provides at least one oscillatory voltage for transmission over the transmission line, the switching system responsive to a security condition of an object to be protected to disconnect the at least one oscillatory voltage from the transmission line; and a monitoring system which receives and detects the at least one oscillatory voltage from the switching system through the transmission line, wherein the monitoring system is impedance matched with the transmission line, the monitoring system monitoring whether the monitoring system and the transmission line are impedance matched due to the security condition or to detect tampering or cutting of the transmission line. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A monitoring system for a security switch assembly, comprising:
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an oscillator for providing an oscillatory voltage to a transmission line and a switching system having a first impedance, wherein the switching system is responsive to a security condition of an object to be protected to switchably alter the first impedance, and wherein the transmission line is impedance matched with each of the oscillator and the switching system; and a mismatch detector connected to the transmission line and impedance matched with the transmission line, wherein the mismatch detector detects whether an impedance mismatch occurs due to the security condition, or tampering or cutting of the transmission line. - View Dependent Claims (27, 28, 29, 30)
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Specification