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Multiplexer-related

Integrated-remote-asynchronous-power-switch

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Integrated remote asynchronous power switch

Details

Inventors: Bonola, Thomas Joseph;
Assignee: Compaq Computer Corporation (Houston, TX)
Primary Examiner: Nguyen; Tan Q.
Assistant Examiner:
Attorney, Agent or Firm: Vinson & Elkins L.L.P.

A computer system has a power supply including switched and unswitched power nodes supplying the appropriate DC voltages for the computer system's internal circuitry. Portions of the computer system's internal circuitry for receiving external communications are coupled to the unswitched power node. Other circuitry is coupled to the switched power node. Responsive to a request from a remote computer, switching circuitry enables power through the switched nodes, thereby powering the computer system. The switching circuitry can enable the switched power node responsive to a signal from an external device, such as an external modem, or through a signal generated by internal communications hardware.

DETAILED DESCRIPTION In accordance with the present invention, a computer with power switching capabilities is described which eliminates substantial disadvantages associated with prior devices.
In the present invention, a computer system comprises data processing circuitry which is coupled to power circuitry through a switched power node.
Responsive to a communications control signal, switching circuitry is operable to control the output of the switched power node in order to enable or disable the data processing circuitry.
The present invention provides significant advantages over the prior art.
The invention may be implemented entirely in hardware and retains full compatibility with current versions of communication software.
In the case of a non-recoverable system error, the invention may produce a "cold" system reset, leaving the computer's hardware and software in a known, working state.
Since the power is controlled by a communications control signal, there is no need for a second party intervention or a manual administration of the computer.
Since full power is applied to the computer only when accessed through the remote device, significant energy resources are conserved.

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