Self-powered network access point

• US 6,141,763 A
• Filed: 09/01/1998
• Issued: 10/31/2000
• Est. Priority Date: 09/01/1998
• Status: Expired due to Term

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Maguire, Gerald G. Jr., Smith, Mark T.
• Primary Examiner(s): Sheikh, Ayaz R.
• Assistant Examiner(s): WILEY, DAVID ARMAND
• Application Number:
  US09/144,965
• Time in Patent Office: 791 Days
• Field of Search: 709/200-253, 713/300, 713/310
• US Class Current: 713/300
• CPC Class Codes: G06F 1/266 Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
• CPC Class Codes: G06F 1/28 Supervision thereof, e.g. detecting power-supply failure by out of limits supervision

Abstract

A system for providing operational power to network access points includes a router having an external power supply to transmit network signals to the network access points. Each self-powered access point includes power extraction circuitry for extracting power from the network signals and a power storage subsystem for storing the extracted power. Signal conversion circuitry is connected to the power storage subsystem for receiving operating power to perform signal conversion of received network signals addressed to a computer and to reconfigure data received from the computer for transmission over the network. In a preferred embodiment, the power extraction circuitry includes a full-power extraction mode and a partial power extraction mode. A data analyzer monitors received network signals to determine whether the signals are required by the computer for processing. If a signal is required for processing, the data analyzer enables the partial power extraction mode in the power extraction circuitry to preserve a minimum signal power required by the computer for signal processing. If the signal is not required for processing, the data analyzer enables the full power extraction mode to extract substantially all power from the signal. Power level detection circuitry determines whether the power storage subsystem stores a minimum power level. If a power level below the minimum is detected, the power level detection circuitry disables the data analyzer and enables the full power extraction mode of the power extraction circuitry until the minimum power is achieved, at which time the data analyzer is re-enabled.

Claims

1. A method for providing operating power to a network device on a communications network comprising the steps of:

receiving network data signals at a location of said network device via said network;

extracting signal energy from at least some of said network data signals, including leaving a predetermined minimum power in said network data signals to allow processing of said network data signals;

storing said extracted signal energy in a power storage subsystem, thereby forming a reserve of power; and

delivering at least a portion of said power in said reserve to a power input of said device, such that said power is accessible by said network device for operation thereof.

2. The method of claim 1 further comprising the step of utilizing said delivered power to convert a subset of said network data signals which are targeted to a communication device into a format for transmission to said communication device and to convert signaling information received from said communication device into a format for transmission over said network.

3. The method of claim 2 wherein said step of extracting power includes:

determining whether each network data signal is targeted for processing by said communication device;

preserving sufficient power in said each network data signal to allow processing of said signal by said communication device if it is determined that said signal requires processing by said communication device; and

extracting substantially all signal energy of said network data signal if it is determined that said network data signal does not require processing by said communication device.

4. The method of claim 3 wherein said preserving step includes extracting surplus power from said signal, said surplus power representing an excess above a predetermined minimum signal power level required by said communication device for signal processing.

5. The method of claim 3 wherein said determining step occurs only after a minimum amount of power has been stored in said power storage subsystem, the method further comprising the step of extracting substantially all signal energy from any said network data signal received prior to storing said minimum power in said power storage subsystem.

6. The method of claim 1 wherein said extracting step includes:

monitoring said network data signals received over said network for network maintenance signals; and

selectively extracting signal energy from said network maintenance signals.

7. The method of claim 1 wherein said step of storing said power includes storing said power in one of a battery and a capacitor arrangement.

8. A system for providing network access to a communication network comprising:

a power extractor configured for extracting a portion of signal energy from first signals transmitted over said communication network, said portion representing an excess over a minimum power level required for processing of said first signals;

a power storage subsystem having an input in communication with an output of said power extractor to store said extracted electrical power; and

a power output having an adaptor for connecting to a network device, said power output being enabled to relay sufficient electrical power from said power storage subsystem to said network device for operation of said network device on said network.

9. The system of claim 8 wherein said network device is a network access point comprising signal conversion circuitry responsive to reception of a first subset of said first signals addressed to a communication device to convert said first subset of first signals to a format for transmission to said communication device, said signal conversion circuitry being configured to convert data received from said communication device to a format for transmission over said communication network.

10. The system of claim 8 wherein said power extractor is configured to selectively extract electrical power from a second subset of said first signals, said subset including network maintenance signals.

11. The system of claim 9 wherein said communication device is a computer and said power extractor has first and second operational modes, said first operational mode being enabled prior to said power storage subsystem achieving a minimum power storage level, said power extractor being configured to extract substantially all signal energy from said first signals while in said first operational mode, said second operational mode being enabled upon said power storage subsystem achieving said minimum power storage level wherein said power extractor is configured to extract only a portion of signal energy from said first subset of said first signals, said portion representing an excess over a minimum power level required by said computer for signal processing.

12. The system of claim 11 further comprising:

a data analyzer configured to enable said second operational mode of said power extractor in response to detecting said first subset of said first signals; and

power level detection circuitry in communication with said power extractor and said data analyzer and for detecting power levels in said power storage subsystem below and above said minimum power storage level, said power level detection circuitry being responsive to detection of a power level below said minimum power storage level to enable said first operational mode and disable said data analyzer, said power level detection circuitry being configured to enable said data analyzer in response to detecting a power level above said minimum power storage level.

13. The system of claim 12 wherein said power extractor includes a third operational mode enabled by said data analyzer in the absence of detecting said first subset of said first signals, said power extractor being configured to extract substantially all signal energy from said first signals while operating in said third mode.

14. The system of claim 8 wherein said power storage subsystem comprises one of a capacitor arrangement and a battery.

15. The system of claim 8 wherein said power extractor is configured to extract said power from said first signals received via one of a coaxial cable, twisted wire pair, fiber optic cable, and wireless signal transmission.

16. A system for providing network access to communication devices utilizing power derived from network signals transmitted over a communication network comprising:

a signal transmission device having an external power supply and means for transmitting first signals over said network;

a plurality of self-powered access points on said network, each self-powered access point comprising;

a) means for receiving said first signals;

b) signal power extraction circuitry for extracting power from at least some of said first signals transmitted by said signal transmission device such that said first signals retain a minimum power level required for processing of said first signals, said signal power extraction circuitry being in communication with said receiving means;

c) a power storage device connected to said signal power extraction circuitry for storing said extracted power; and

d) a signal conversion device electrically coupled to said power storage device to receive operating power therefrom, said signal conversion circuitry being configured to convert a subset of said first signals addressed to a communication device to a format for transmission to said communication device, said signal conversion circuitry being responsive to reception of data transmitted by said communication device to reconfigure said data for transmission over said communication network.

17. The system of claim 16 wherein said each self-powered access point includes a data analyzer configured to detect said subset of said first signals, said signal power extraction circuitry having a first mode enabled by said data analyzer in response to detection by said data analyzer of said subset of first signals, wherein said first mode is limited to extracting only surplus power from said communication signals such that said subset of first signals retain a selected reduced power level required by said communication device for signal processing, said signal power extraction circuitry having a second mode expanded to extract substantially all power in said first signals received over said network in the absence of said data analyzer detecting said subset of said first signals.

18. The system of claim 17 wherein said each self-powered access point includes power level detection circuitry configured to enable a third mode of signal power extraction circuitry in response to detection of a power level in said power storage device below a minimum power level required for operation of said signal conversion device, said signal power extraction circuitry being configured to extract substantially all signal energy from all said first signals while operating in said third mode.

19. The system of claim 16 further comprising a data analyzer configured to enable a second mode of operation in said signal power extraction circuitry in the absence of detecting said subset of said first signals wherein said signal power extraction circuitry is configured to extract substantially all signal energy from all said first signals except said subset of said first signals while operating in said second mode, said data analyzer being configured to disable said signal power extraction circuitry in response to detecting said subset of said first signals.