Method and system for providing DC power on local telephone lines

• US 8,107,618 B2
• Filed: 06/21/2006
• Issued: 01/31/2012
• Est. Priority Date: 01/30/2003
• Status: Expired due to Fees

• Current Assignee: MOSAID Technologies Inc. (f/k/a Conversant Intellectual Property Management)
• Original Assignee: Mosaid Technologies Incorporated (MOSAID Technologies Inc. (f/k/a Conversant Intellectual Property Management))
• Inventors: Binder, Yehuda, Hazani, Ami, Kofman, Semion
• Primary Examiner(s): Briney, III, Walter F
• Application Number:
  US11/471,665
• Publication Number:
  US 20060233354A1
• Time in Patent Office: 2,050 Days
• Field of Search: 379/387.01, 379/399.01, 379/413
• US Class Current: 379/413
• CPC Class Codes: H04M 19/08 with current supply sources at the substations generating ringing current H04M19/04
• CPC Class Codes: H04M 9/08 Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic

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.

Claims

1. A device for use with a wire pair connected for simultaneously carrying a power signal at a power signal frequency, the power signal having a higher power level than a DC telephone signal, and a bi-directional packet-based digital data signal in a digital data frequency band at least in part above an analog telephone frequency band and above the power signal frequency, said device being operative to couple the bi-directional packet-based digital data signal to a data unit, said device comprising:

a wiring connector for connecting to the wire pair;

a high pass filter coupled to said wiring connector for passing signals in the digital data frequency band;

a modem coupled to said high pass filter for transmitting the bi-directional packet-based digital data signal to, and receiving the bi-directional packet-based digital data signal from, the wire pair;

a bi-directional packet-based digital data port couplable to the data unit for coupling the bi-directional packet-based digital data signal to the data unit; and

a single enclosure housing said wiring connector, said high pass filter, said modem, and said digital data port, wherein the modem is coupled to said wiring connector to be powered from the power signal.

2. The device according to claim 1, wherein the power signal is a DC power signal.

3. The device according to claim 2, wherein the power signal is a DC power signal having a voltage on the telephone wire pair that is distinct from a −

48 volt DC analog telephone signal voltage, and said device further comprises a DC/DC voltage converter coupled between said wiring connector and said modem for converting the DC power signal voltage to a voltage proper for powering said modem.

4. The device according to claim 1, further operative to power a unit by the power signal, said device further comprising a power connector connectable to the unit and coupled to said wiring connector to receive the power signal from said wire pair, and connectable to supply at least part of the received power to the unit.

5. The device according to claim 1, wherein the wire pair is a telephone wire pair, said wiring connector is a telephone connector, and said modem is a telephone line modem.

6. The device according to claim 5, wherein the bi-directional digital data signal is a DSL-based signal and said telephone line modem is an xDSL modem, or the bi-directional digital data signal is a HomePNA signal and said telephone line modem is a HomePNA modem.

7. The device according to claim 5, wherein the telephone wire pair is a part of a subscriber loop.

8. The device according to claim 1, wherein the telephone wire pair is at least in part in walls of a residential building.

9. The device according to claim 1, wherein said single enclosure is:

attachable to a support surface;

or mountable to a wall of a building;

or attachable to a wall opening or to an outlet cavity.

10. The device according to claim 1, wherein said single enclosure is a wall-mountable enclosure that is constructed to have at least one of the following:

a form substantially similar to that of a standard outlet;

wall mounting elements substantially similar to those of a standard wall outlet;

a shape allowing direct mounting in an outlet opening or cavity; and

a form to at least in part substitute for a standard outlet.

11. The device according to claim 1, wherein communication of the bi-directional packet-based digital with the data unit is based on a wired medium, and said digital data port is a standard digital data connector.

12. The device according to claim 11, wherein the bi-directional packet-based digital communication with the data unit is based on IEEE802.3 standard 10BaseT or 100BaseT, and wherein the standard digital data connector is of RJ-45 type.

13. The device according to claim 11, wherein the bi-directional packet-based digital communication with the data unit is based on a Universal Standard Bus (USB), and the standard digital data connector is a USB connector.

14. The device according to claim 1, wherein:

communication of the bi-directional packet-based digital with the data unit is based on a non-wired medium using Radio frequency (RF);

said device further comprises a RF transceiver coupled between said bi-directional packet-based digital data port and said modem; and

said RF transceiver is coupled to said wiring connector to be powered by the power signal.

15. The device according to claim 1, wherein:

the wire pair further is connected for concurrently carrying at least an AC telephone signal;

said device is further operative to couple the AC telephone signal to an analog telephone set;

said device further comprises a telephone connector for connecting to the analog telephone set; and

said telephone connector is coupled to said wiring connector for coupling the AC telephone signal to the analog telephone set.

16. The device according to claim 15, further comprising a current limiter coupled between said telephone connector and said wiring connector and operative to limit the current available to the analog telephone set.

17. The device according to claim 1, further comprising a low pass filter coupled to said wiring connector for passing only the power signal.

18. The device according to claim 17, wherein said low pass filter comprises an inductor or a gyrator.