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Browse Prior Art Database

Method for Switching between Power-On and Standby Modes

IP.com Disclosure Number: IPCOM000116111D
Original Publication Date: 1995-Aug-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 77K

Publishing Venue

IBM

Related People

Dombrowski, C: AUTHOR [+2]

Abstract

Disclosed is the use of a two-position switch to change a computing system between a power-on mode, in which normal operations can occur, and a standby mode, which allows any unattended power-on capability supported by the system.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Method for Switching between Power-On and Standby Modes

      Disclosed is the use of a two-position switch to change a
computing system between a power-on mode, in which normal operations
can occur, and a standby mode, which allows any unattended power-on
capability supported by the system.

      The Figure is a schematic view of the switching part of the
system, which includes a planar (system) board 1, a switchable power
supply 2, and a two position switch 3, which is a Double Pole, Double
Throw (DPDT) manual pushbutton type.  In the undepressed position
shown, which places the system in the standby mode, switch 3 connects
central terminals 4 and 5 with terminals 6 and 7, respectively.  In
the depressed position, which places the system in the power-on mode,
switch 3 connects central terminals 4 and 5 with terminals 8 and 9,
respectively.  Terminals 6 and 9 are wired together, and terminal 5
is tied to electrical ground.

      When the -Power on Request signal, from terminal 6 to power
supply 2 is low, or grounded, the power supply is turned on, provided
AC line power is present.  The -Unattended Power On Request signal is
driven by the unattended power control logic circuit of planar board
1 through terminal 4.  An unattended power on request is issued when
this signal is low.  No such request is issued when this signal is
high.  The state of the ˛庝힝Unattended signal from terminal 7
is read by a software program executing through planar board 1.  A
low state of this signal indicates that the system has been
powered-on by a stimulus other than switch 3, while a high state of
this
signal indicates that the system has been powered-on using switch 3.

      With switch 3 in the standby position shown, the connection of
terminal 4 to terminal 9 causes the -Power-on Reque...