Power conservation for pots and modulated data transmission
DCFirst Claim
1. A method of conserving power in a terminal unit having a transmitter and receiver for modulated data communication over a communications loop, comprising:
- monitoring the loop to detect a shut-down condition;
reducing power consumption of demodulation circuitry in the terminal unit upon detection of a shut-down condition;
monitoring the loop with a monitoring circuit to detect a resume signal that is not a modulated data signal and that is outside the voiceband frequency range on the loop; and
activating demodulation circuitry when the resume signal is detected.
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Abstract
Methods and apparatus for conserving power in terminal units that transmit and receive modulated data over a communications loop that is shared with voiceband telephone equipment are disclosed. The methods include monitoring the loop to detect a shut-down condition and reducing power consumption of certain of the electronic circuits in the terminal unit upon detection of a shut-down condition. The methods also include monitoring the loop with a monitoring circuit to detect a resume signal outside the voiceband frequency range on the loop and restoring power to the electronic circuits when the resume signal is detected. The apparatuses include a modulated data transmitting and receiving unit having a connector for coupling the unit to a communications loop, circuitry to transmit and receive a modulated data signal in a frequency range above voiceband, and circuitry to detect a resume signal in the frequency range above voiceband and then to initiate a power up sequence for the transmit and receive circuitry.
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Citations
27 Claims
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1. A method of conserving power in a terminal unit having a transmitter and receiver for modulated data communication over a communications loop, comprising:
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monitoring the loop to detect a shut-down condition; reducing power consumption of demodulation circuitry in the terminal unit upon detection of a shut-down condition; monitoring the loop with a monitoring circuit to detect a resume signal that is not a modulated data signal and that is outside the voiceband frequency range on the loop; and activating demodulation circuitry when the resume signal is detected. - View Dependent Claims (2, 3, 4, 5, 6, 14)
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7. A modulated data transmitting and receiving unit, comprising:
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a connector operatively coupling the unit to a communications loop; first circuitry coupled to the connector to transmit and receive a modulated data signal in a frequency range above voiceband; memory circuitry operatively coupled to the first circuitry to store loop characteristic parameters in a low-power state and to transfer loop characteristic parameters to the first circuitry during a power up sequence; and second circuitry coupled to the connector to detect a resume signal in the frequency range above voiceband and then to initiate the power up sequence for the first circuitry. - View Dependent Claims (8, 9, 10, 11, 12, 13, 15)
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16. A modulated data transmitting and receiving unit, comprising:
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a connector operatively coupling the unit to a communications loop; a control signal interface for receiving a start-up signal; first circuitry coupled to the connector to transmit and receive a modulated data signal at frequencies above voiceband; memory circuitry operatively coupled to the first circuitry to store loop characteristic parameters in a low-power state and to transfer loop characteristic parameters to the first circuitry upon receipt of a start-up signal on a control signal interface; and second circuitry coupled to the connector to transmit a resume signal on the loop upon receipt of the start-up signal on the control signal interface. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A modulated data transmitting and receiving unit, comprising:
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a connector operatively coupling the unit to a communications loop; demodulator circuitry coupled to the connector to receive a modulated data signal on the loop; power control circuitry coupled to the demodulator circuitry, the power control circuitry setting the demodulator circuitry in a reduced power state upon receipt of a low-power signal; monitoring circuitry operatively coupled to the connector and to the power control circuitry, the monitoring circuitry being configured detect a shut-down condition on the loop and then to provide the low-power signal to the power control circuitry and the monitor circuitry further comprises detector circuitry to detect a resume signal that is not a modulated data signal and that is outside the voiceband frequency range, and then to initiate a demodulator circuitry power up sequence. - View Dependent Claims (25, 26, 27)
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Specification