Telephone extension system utilizing power line carrier signals
First Claim
1. A power line telephone extension system for carrying signals between, (1) a subscriber'"'"'s telephone line of a conventional telephone communication system, wherein a separate telephone line is provided from a central switching system at one location to each subscriber at the subscriber'"'"'s location and each subscriber telephone line includes at least two wires, the ring line and the tip line and, (2) the same subscriber'"'"'s extension telephone, over available power wires at the subscriber'"'"'s location and power wire connector outlets, also at the subscriber'"'"'s location, comprising at the subscriber'"'"'s location:
- a subscriber master location near said subscriber telephone line and near a power wire connector outlet anda subscriber extension telephone location near a power wire connector outlet; and
at the subscriber'"'"'s master location;
a voice signal detector circuit having its input electrically connected to the tip line for detecting voice signals on the subscriber'"'"'s telephone line,a ring detector circuit having its input electrically connected to the ring line for detecting ring signals on the subscriber'"'"'s telephone line, anda master output electrically reactive coupling device electrically connected between the outputs of said voice signal and ring detector circuits and said power connector outlet near the master location,whereby the power wires carry the detected telephone line signals from the master location to the extension location thereon; and
at the extension location;
an extension telephone,receiver means for said extension telephone, andmeans for coupling said voice and ring telephone line signals from the extension location to said extension telephone receiver means;
whereby the extension telephone receives the voice and ring signals from the telephone line.
3 Assignments
0 Petitions
Accused Products
Abstract
An extension telephone system communicates with a conventional subscriber telephone line where the subscriber'"'"'s line telephone is located, through available AC power wires which carry signals that may be modulations of RF carrier frequencies and which are coupled to the power wires. Incoming telephone line signals are detected and modulate a first RF carrier frequency which is coupled to the AC power wires at the line telephone location and these signals are coupled from the AC power wires at an extension telephone location, and, demodulated and fed to an extension telephone which is energized by DC power derived from the AC power wires at the extension location. The extension telephone produces extension telephone signals which modulate a second RF carrier frequency which is coupled to the AC power wires at the extension location and this modulated carrier is coupled from the AC power wires and demodulated at the line telephone to produce the extension telephone signals in suitable form for applying to the telephone line. Thus, telephone calls to the subscriber'"'"'s line telephone can be received by the extension telephone and calls to the telephone extension telephones can be connected to this system wherever there is access to the same AC power wires.
96 Citations
18 Claims
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1. A power line telephone extension system for carrying signals between, (1) a subscriber'"'"'s telephone line of a conventional telephone communication system, wherein a separate telephone line is provided from a central switching system at one location to each subscriber at the subscriber'"'"'s location and each subscriber telephone line includes at least two wires, the ring line and the tip line and, (2) the same subscriber'"'"'s extension telephone, over available power wires at the subscriber'"'"'s location and power wire connector outlets, also at the subscriber'"'"'s location, comprising at the subscriber'"'"'s location:
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a subscriber master location near said subscriber telephone line and near a power wire connector outlet and a subscriber extension telephone location near a power wire connector outlet; and at the subscriber'"'"'s master location; a voice signal detector circuit having its input electrically connected to the tip line for detecting voice signals on the subscriber'"'"'s telephone line, a ring detector circuit having its input electrically connected to the ring line for detecting ring signals on the subscriber'"'"'s telephone line, and a master output electrically reactive coupling device electrically connected between the outputs of said voice signal and ring detector circuits and said power connector outlet near the master location, whereby the power wires carry the detected telephone line signals from the master location to the extension location thereon; and at the extension location; an extension telephone, receiver means for said extension telephone, and means for coupling said voice and ring telephone line signals from the extension location to said extension telephone receiver means; whereby the extension telephone receives the voice and ring signals from the telephone line. - View Dependent Claims (2)
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3. A power line telephone extension system for carrying signals between, (1) a subscriber'"'"'s telephone line of a conventional telephone communication system, wherein a separate telephone line is provided from a central switching system at one location to each subscriber at the subscriber'"'"'s location and each subscriber'"'"'s telephone line includes at least two wires, the ring line and the tip line and, (2) the same subscriber'"'"'s extension telephone over available power wires at the subscriber'"'"'s location and power wire connector outlets at the subscriber'"'"'s location, comprising at the subscriber'"'"'s location:
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a subscriber master location near said subscriber telephone line and near a power wire connector outlet, and a subscriber extension telephone location near a power wire connector outlet; and at the subscriber master location; a voice signal detector circuit having its input electrically connected to the tip line for detecting voice signals on the subscriber'"'"'s telephone line, a ring detector circuit having its input electrically connected to the ring line for detecting ring signals on the subscriber'"'"'s telephone line, means for producing a master carrier frequency, modulating means responsive electrically directly to the outputs of said voice signal and ring detector circuits for modulating the master carrier frequency, producing modulated master carrier signals, and a master output electrically reactive coupling device electrically connected between the output of said modulating means and said power connector outlet near the master location, whereby the power wires carry the modulated master carrier signals from the master location to the extension location thereon; and at the extension location; an extension telephone, receiver means for said extension telephone, means for electrically coupling said modulated master carrier signals from said power connector outlet near the extension location to the extension telephone receiver means, means for demodulating said received modulated master carrier signals and detecting said telephone line voice and ring signals in the output thereof, and means for electrically coupling said detected telephone line voice and ring signals to the extension telephone; whereby the extension telephone receives voice and ring signals from the telephone line. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power line telephone extension system for use with a conventional subscriber telephone line of a conventional telephone communication system, wherein a separate telephone line is provided from a central switching system at one location to each subscriber at the subscriber'"'"'s location and a subscriber telephone line includes at least two wires, the ring line and the tip line, said system serving to transmit signals to the subscriber'"'"'s telephone line from an extension telephone at the subscriber'"'"'s location over available power wires and power wire connector outlets, also at the subscriber'"'"'s location, comprising, at the subscriber'"'"'s location:
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a subscriber master location near said subscriber telephone line and near a power wire connector outlet, and a subscriber extension telephone location near a power wire connector outlet; and at the extension location; an extension telephone, a source of electrical power for the extension telephone, whereby the extension telephone produces voice and dial signals when it is used by the subscriber, means for producing an extension carrier frequency, means for modulating said extension carrier frequency by said extension dial and voice signals producing modulated extension carrier signals, and means for coupling said modulated extension carrier signals to said power connector outlet near the extension location, whereby the power wires conduct said modulated extension carrier signals from the extension location to the master location; and at the master location; a master receiver, an extension carrier frequency demodulator, a master receiver electrically reactive coupling device electrically connected between said power connector outlet near the master location and said extension carrier frequency demodulator, means for detecting in the output of said extension carrier frequency demodulator said extension dial signals and voice signals, and means for electrically coupling said detected extension dial signals and voice signals to said subscriber tip line; whereby calls represented by the extension dial signals are placed to the telephone communication system by the extension telephone and voice signals initiated by the extension telephone are conducted by the telephone line.
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14. A power line telephone extension for carrying signals between, (1) a subscriber'"'"'s telephone line of a conventional telephone communication system, wherein a separate telephone line is provided from a central switching system at one location to each subscriber at the subscriber'"'"'s location and each subscriber telephone line includes at least two wires, the ring line and the tip line and, (2) the same subscriber'"'"'s extension telephone, over available power wires at the subscriber'"'"'s location and power wire connector outlets, also at the subscriber'"'"'s location, comprising, at the subscriber'"'"'s location:
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a subscriber master location near said subscriber telephone line and near a power wire connector outlet, and a subscriber extension telephone location near a power wire connector outlet; and at the subscriber'"'"'s master location; a voice signal detector circuit having its input electrically connected to the tip line for detecting voice signals on the subscriber'"'"'s telephone line, a ring detector circuit having its input electrically connected to the ring line for detecting ring signals on the subscriber'"'"'s telephone line, means for producing a master carrier frequency, modulating means responsive electrically directly to the outputs of said voice signal and ring detector circuits for modulating the master carrier frequency producing modulated master carrier signals, and a master output electrically reactive coupling device electrically connected between the output of said modulating means and said power connector outlet near the master location, whereby the power wires carry the modulated master carrier signals from the master location to the extension location thereon; and at the extension location; an extension telephone, extension telephone receiver means, means for coupling said modulated master carrier signals from said power connector outlet near the extension location to the extension receiver means, means for demodulating said received modulated master carrier signals, and means for coupling said demodulated master signals to the extension telephone, whereby the extension telephone receives signals from the telephone line, a source of electrical power for the extension telephone, whereby the extension telephone produces voice and dial signals when it is used by the subscriber, means for producing an extension carrier frequency, means for modulating said extension carrier frequency by the extension dial and voice signals producing modulated extension carrier frequency signals, and means for coupling said modulated extension carrier signals to said power connector outlet near the extension location, whereby the power wires carry said modulated extension carrier signals from the extension location to the master location; and at the master location; a master receiver, an extension carrier frequency demodulator, a master receiver electrically reactive coupling device electrically connected between said power connector outlet near the master location and said extension carrier frequency demodulator, means for detecting said extension dial signals and voice signals in the output of said demodulator, and means for electrically coupling said detected extension dial signals and voice signals to said subscriber tip line, whereby calls are received from and placed on the telephone line by the extension telephone and voice signals initiated by the extension telephone are carried on the telephone line. - View Dependent Claims (15, 16, 17, 18)
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Specification