Power conservation system for a modem in a computer system

Details Power conservation system for a modem in a computer system Power conservation system for a modem in a computer system

1995-04-20

1996-12-24

Zele, Krista M.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379 93, 379372, H04M 1100

Patent

active

055880541

ABSTRACT:
A power conservation system for a modem in a computer system having a primary power supply and an auxiliary power supply, including 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 the telephone ring signal line, a power management system having an input coupled to the ring detect circuit and an output coupled to the primary power supply, the power management system being responsive to the 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 a normal mode of operation, wherein the auxiliary power supply is coupled to the ring detect circuit for supplying power thereto when the computer system is in the power conservation mode of operation, whereby the ring detect circuit is maintained in an active state even during the power conservation mode of operation of the computer system.

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MacBride et al., "Remote Computer Power-On Via Switched Telephone Network", IBM Technical Disclosure Bulletin, vol. 25, No. 6, Nov. 1982. p. 3064.

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