Power conservation system for a modem in a computer system

  • US 5,588,054 A
  • Filed: 04/20/1995
  • Issued: 12/24/1996
  • Est. Priority Date: 10/27/1994
  • Status: Expired due to Term
First Claim
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1. A power conservation system for a modem in a computer system having a primary power supply and an auxiliary power supply, comprising:

  • a ring detect circuit coupled to a telephone ring signal line for generating a ring detect signal in response to detection of a ring signal on said telephone ring signal line, said ring detect circuit also being coupled to a power supply voltage for supplying power to said ring detect circuit during a normal mode of operation;

    a power management system having an input coupled to said ring detect circuit and an output coupled to the primary power supply, said power management system being responsive to said ring detect signal for switching the primary power supply from a first level corresponding to a power conservation mode of operation of the computer system to a second level corresponding to said normal mode of operation; and

    ,wherein said auxiliary power supply is coupled to said ring detect circuit for supplying power to said ring detect circuit when the computer system is in said power conservation mode of operation, whereby said ring detect circuit is maintained in an active state even during said power conservation mode of operation of the computer system.

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