Communication interface circuit having network connection detect

Details Communication interface circuit having network connection detect Communication interface circuit having network connection detect

1994-09-29

1997-07-15

Ray, Gopal C.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

3404252, G06F 132

Patent

active

056492103

ABSTRACT:
A method and apparatus for interfacing a computer system with another system is described including an interface circuit. The interface circuit detects if the voltage level on a signal line represents a valid logic level and if so, provides a valid signal in response. The valid signal allows the computer system to which the interface circuit is coupled to provide power to the interface circuit such that network communication may be established and the interface circuit can internally turn on and off sections of its circuitry without intervention or control by the computer system. In addition, the computer system can use the Invalid signal to control software and/or to notify the user of the status of the computer system. When the interface circuit detects that the voltage level on the signal line does not represent a valid logic level, an Invalid signal is provided allowing the application of power to certain portions of the interface circuit to be suspended so that overall power consumption by the computer system is reduced.

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patent: 5327463 (1994-07-01), Matsumoto
patent: 5446404 (1995-08-01), Badyal et al.
patent: 5481194 (1996-01-01), Schantz et al.

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