Central station alarm reporting system
First Claim
1. In a central station alarm reporting system having a central station connected to at least one remote premises unit over a communication channel, said remote premises unit having means for providing at least two high frequency signals and at least two low frequency signals and having transmitting means for transmitting at least two bits of parallel digital information in a single transmission, said single transmission comprised of at least one of said low frequency signals and at least one of said highfrequency signals, said at least two low frequency signals, said at least two low frequency signals and said at least two high frequency signals having at least four combinations for single transmissions, said central station comprising:
- receiving means for receiving said transmission from said remote premises unit; and
,decoding means having an input connected to said receiving means and having at least two output lines for providing at least a two bit digital word capable of completely describing the at least four combinations of said at least two low and at least two high frequency signals.
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Accused Products
Abstract
A central station alarm reporting system having a remote premises unit which is polled by the central station using FSK messages and reports its alarm information in DTMF (dual tone multifrequency) messages wherein a plurality of parallel bits of information is reported by the remote premises unit using a transmission comprising two tones, one tone selected from a group of high frequencies and one tone selected from a group of low frequencies, and said central station decoding the tone transmission into its bits of information. For example, if four low frequencies and four high frequencies are used at the remote premises, then the central station provides four output lines which are capable of completely describing the sixteen combinations of four parallel bits of information which can be constructed when selecting two tones for a dual tone multifrequency transmission, one tone selectable from a group of four low frequencies and one tone selectable from a group of four high frequencies.
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Citations
48 Claims
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1. In a central station alarm reporting system having a central station connected to at least one remote premises unit over a communication channel, said remote premises unit having means for providing at least two high frequency signals and at least two low frequency signals and having transmitting means for transmitting at least two bits of parallel digital information in a single transmission, said single transmission comprised of at least one of said low frequency signals and at least one of said highfrequency signals, said at least two low frequency signals, said at least two low frequency signals and said at least two high frequency signals having at least four combinations for single transmissions, said central station comprising:
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receiving means for receiving said transmission from said remote premises unit; and
,decoding means having an input connected to said receiving means and having at least two output lines for providing at least a two bit digital word capable of completely describing the at least four combinations of said at least two low and at least two high frequency signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In a central station alarm reporting system having at least one remote premises unit for transmitting at least two bits of parallel information in a single transmission over a communication system to a central station, said central station having at least two output lines for providing at least a two bit digital word capable of completely describing all combinations of said single transmission, the remote premises unit comprising:
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alarm sensor means for sensing an alarm condition at the remote premises unit; and
,transmission control means connected to said alarm sensor means and having means for providing at least two high frequencyf signals and at least two low frequency signals and having transmitting means for transmitting at least two bits of parallel digital alarm information in a single transmission, said single transmission comprised of at least one of said low frequency signals and at least one of said high frequency signals, said at least one of said low frequency signals and said at least one of said high frequency signals having at least four combinations for single transmissions. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. In a central station alarm reporting system having a central station connected to at least one remote premises unit over a communication channel, said remote premises unit having means for providing at least four high frequency signals and at least four low frequency signals and having transmitting means for transmitting at least four bits of parallel digital information in a single transmission, said single transmission comprised of at least one of said low frequency signals and at least one of said high frequency signals, said at least one of said low frequency signals and said at least one of said high frequency signals having at least sixteen combinations for single transmissions, said central station comprising:
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receiving means for receiving said transmission from said remote premises unit; and
,decoding means having an input connected to said receiving means and having at lest four output lines for providing a digital word capable of completely describing the at least sixteen combinations of said at least four low and at least four high frequency signals. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. In a central station alarm reporting system having at least one remote premises unit for transmitting at least four bits of parallel information in a single transmission over a communication system to a central station, said central station having at least four output lines for providing at least a four bit digital word capable of completely describing all combinations of said signal, the remote premises unit comprising:
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alarm sensor means for sensing an alarm condition at the remote premises; and
,transmission control means connected to said alarm sensor means, said transmission control means having means for providing at least four high frequency signals and at least four low frequency signals and having transmitting means for transmitting at least four bits of parallel digital information in a single transmission, said single transmission comprised of at least one of said low frequency signals and at least one of said high frequency signals, said at least one of said low frequency signals and said at least one of said high frequency signals having at least sixteen combinations for single transmissions. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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31. A central station alarm reporting system comprising:
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a transmission channel for transmitting messages bidirectionally which are supplied to it; at least one remote premises unit connected to said transmission channel system and comprising alarm sensor means for sensing an alarm condition at the remote premises, transmission control means connected to said alarm sensor means, said transmission control means having means for providing at least four high frequency signals and at least four low frequency signals and having transmitting means for transmitting at least four bits of parallel digital alarm information in a single transmission, said single transmission comprised of at least one of said low frequency signals and at least one of said high frequency signals, said at least one of said low frequency signals and said at least one of said high frequency signals having at least sixteen combinations for single transmissions; and
,a central station connection to said transmission channel system and comprising receiving means for receiving said transmission from said remote premises unit, and decoding means having an input connected to said receiving means and having at least four output lines for providing a digital word capable of completely describing the at least sixteen combinations of said at least four low and at least four high frequency signals. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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Specification