Method and system for providing DC power on local telephone lines
First Claim
1. A network for coupling a telephone set to a telephone service, the network comprising:
- a wire pair;
a connection point for connecting the network to the telephone service;
an AC Pass/DC Stop device connected in series between said wire pair and said connection point for conducting AC telephony signals and blocking DC flow from the telephone service into said wire pair;
a power supply coupler DC coupled to said wire pair for coupling DC power into said wire pair;
a load coupler DC coupled to said wire pair for coupling DC power to a load; and
a telephone coupler for coupling a telephone set to said wire pair for conducting telephony signals between said wire pair and the telephone set.
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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.
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Citations
52 Claims
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1. A network for coupling a telephone set to a telephone service, the network comprising:
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a wire pair;
a connection point for connecting the network to the telephone service;
an AC Pass/DC Stop device connected in series between said wire pair and said connection point for conducting AC telephony signals and blocking DC flow from the telephone service into said wire pair;
a power supply coupler DC coupled to said wire pair for coupling DC power into said wire pair;
a load coupler DC coupled to said wire pair for coupling DC power to a load; and
a telephone coupler for coupling a telephone set to said wire pair for conducting telephony signals between said wire pair and the telephone set. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power unit device connectable in series between a telephone service interface and a wire pair of a network for connecting a telephone set to the telephone service, said device comprising:
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an AC Pass/DC Stop device connectable in series between the wire pair and the interface for conducting AC telephony signals and blocking DC flow from the telephone service into the wire pair; and
a power supply coupler that is DC couplable to the wire pair to couple DC power into the wire pair. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. Apparatus for supplying to a telephone service an indication of an off-hook condition of a telephone set that is connected to the telephone service by a network that includes a medium that does not allow DC off-hook signaling from the telephone set directly to the telephone service, said apparatus comprising:
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an off-hook receiver couplable to the wire pair for receiving an off-hook indication when the telephone set is off-hook; and
an off-hook simulator coupled to said off-hook receiver an to the interface for supplying a simulated off-hook indication to the telephone service in response to receipt of the off-hook indication by said off-hook receiver. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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- 25. A telephone unit device connectable in series between a telephone set and a wire pair of a network coupled to a telephone service and carrying DC power, said device comprising means to conduct the telephone signal and to convert the DC power to allow a telephone set to be connected thereto.
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33. Apparatus for supplying to a telephone service an indication of an off-hook condition of a telephone set that is connected to the telephone service by a network that includes a media that does not allow DC off-hook signaling from the telephone set directly to the telephone service, said apparatus comprising:
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an off-hook detector couplable to the telephone set for detecting an off-hook condition of the telephone set;
an off-hook transmitter coupled to said off-hook detector and to the wire pair for supplying an off-hook indication to the wire pair in response to detection of an off-hook condition by said off-hook detector. - View Dependent Claims (34, 35, 36, 37, 38, 39)
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- 40. A load coupler device connectable in series between a DC load and a wire pair of a network coupled to a telephone service and carrying DC power, said device comprising means to conduct the DC power to the DC load and to stop the telephony signal.
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46. A method for carrying DC power over a wire pair of a network for coupling a telephone set to a telephone service, the network having a connection point for connecting the network to the telephone service, said method comprising:
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connecting an AC Pass/DC Stop device in series between the wire pair and the connection point for conducting AC telephony signals and blocking DC flow from the telephone service into the wire pair;
DC coupling a power supply coupler to the wire pair for coupling DC power into the wire pair;
DC coupling a load coupler to the wire pair for coupling DC power to a load; and
coupling a telephone coupler to the wire pair for coupling a telephone set to the wire pair for conducting telephony signals between the wire pair and the telephone set. - View Dependent Claims (47, 48, 49, 50, 51, 52)
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Specification