Line supervision
First Claim
1. A security system for supervising the integrity of a communication line comprising:
- supervision means connected to said communication line havingfirst means for supplying first and second randomly generated signals to said communication line,second means for providing a third signal based upon said first and second randomly generated signals, andthird means for comparing said third signal to a fourth signal and for providing an output signal when said third and fourth signals are not in agreement; and
,transponder means connected to said communication line havingfourth means for comparing said first and second randomly generated signal to produce said fourth signal,fifth means connected to said fourth means for supplying said fourth signal to said communication line.
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Accused Products
Abstract
A security system for supervising the integrity of a communication line having a supervising apparatus which generates first and second random signals, compares these first and second randomly generated signals to provide a third signal and compares this third signal to a fourth signal, and a transponder, also connected to the line, which compares the first and second randomly generated signals to provide the fourth signal to the communication line. The use of randomly generated signals increases the difficulty of breaching line security such that, when the supervisory apparatus detects a difference between the third and fourth signals, it can provide an appropriate alarm, indication, or control.
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Citations
34 Claims
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1. A security system for supervising the integrity of a communication line comprising:
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supervision means connected to said communication line having first means for supplying first and second randomly generated signals to said communication line, second means for providing a third signal based upon said first and second randomly generated signals, and third means for comparing said third signal to a fourth signal and for providing an output signal when said third and fourth signals are not in agreement; and
,transponder means connected to said communication line having fourth means for comparing said first and second randomly generated signal to produce said fourth signal, fifth means connected to said fourth means for supplying said fourth signal to said communication line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A security system for supervising the integrity of a communication line comprising:
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supervision means connected to said communication line for supplying first and second randomly generated signals to said communication line, means for comparing said first and second randomly generated signals to produce a third signal, and means for comparing said third signal to a fourth signal for providing an output signal when said third and fourth signals are not in agreement; and
,transponder means connected to said communication line for comparing said first and second randomly generated signals to produce said fourth signal and for transmitting said fourth signal to said communication line. - View Dependent Claims (31, 32, 33, 34)
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Specification