Method and system for providing DC power on local telephone lines
First Claim
1. A network for carrying analog telephone, power and data signals, the network comprising:
- a single wire pair concurrently carrying a DC power signal, an analog telephone signal and a bi-directional digital data signal, wherein the analog telephone signal and the bi-directional digital data signal are carried using frequency division multiplexing, with the digital data signal being carried in a digital data signal frequency band and the analog telephone signal being carried in an analog telephone signal frequency band lower than the digital data signal frequency band;
a central office-side unit connected to said single wire pair for coupling a central office-side telephone signal to the analog telephone signal, for converting a power source signal to the DC power signal, and for coupling a data network to the bi-directional digital data signal; and
a subscriber-side unit connected to said single wire pair, said subscriber-side unit comprising;
a telephone connector connectable to an analog telephone set for coupling the analog telephone set to the analog telephone signal, anda data port couplable to a data unit for coupling the data unit to the bi-directional digital data signal,wherein the subscriber-side unit is at least in part powered by the DC power signal.
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Accused Products
Abstract
A system for providing DC power on local telephone lines, such as telephone lines in a building or office, for powering devices and circuitry associated with communications over those telephone lines, as well as other functions. Desired voltage and power levels are supplied over local telephone lines by separating the DC power component from the central office or private branch exchange with a DC blocking filter while passing all AC telephony signals. A distinct DC power is then imposed over the telephone line for powering both the telephony service as well as other loads. Conventional telephone off-hook detection is simulated for compatibility with the central office or private branch exchange. The functions required may be integrated, partially or fully within a telephone outlet.
728 Citations
26 Claims
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1. A network for carrying analog telephone, power and data signals, the network comprising:
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a single wire pair concurrently carrying a DC power signal, an analog telephone signal and a bi-directional digital data signal, wherein the analog telephone signal and the bi-directional digital data signal are carried using frequency division multiplexing, with the digital data signal being carried in a digital data signal frequency band and the analog telephone signal being carried in an analog telephone signal frequency band lower than the digital data signal frequency band; a central office-side unit connected to said single wire pair for coupling a central office-side telephone signal to the analog telephone signal, for converting a power source signal to the DC power signal, and for coupling a data network to the bi-directional digital data signal; and a subscriber-side unit connected to said single wire pair, said subscriber-side unit comprising; a telephone connector connectable to an analog telephone set for coupling the analog telephone set to the analog telephone signal, and a data port couplable to a data unit for coupling the data unit to the bi-directional digital data signal, wherein the subscriber-side unit is at least in part powered by the DC power signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A device for coupling an analog telephone signal to an analog telephone set and for coupling a digital data signal to a data unit, for use with a single wire pair carrying analog telephone, bi-directional digital data and a DC power signal, the analog telephone signal and the digital data signal being carried using frequency division multiplexing, with the digital data signal being carried in a digital data signal frequency band and the analog telephone signal being carried in an analog telephone signal frequency band lower than the digital data signal frequency band, the device comprising:
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a wiring connector for connecting to the wire pair; a low pass filter coupled to said wiring connector for passing the analog telephone signal; a telephone connector coupled to the low pass filter and connectable to an analog telephone set, for coupling the analog telephone signal to the analog telephone set; a high pass filter coupled to said wiring connector for passing the digital data signal; a modem coupled to said high pass filter for coupling to the digital data signal; and a data port couplable to a data unit for coupling the digital data signal to the data unit, wherein the device is at least in part powered by the DC power signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification