Browse Prior Art Database

Power-Off Override

IP.com Disclosure Number: IPCOM000114373D
Original Publication Date: 1994-Dec-01
Included in the Prior Art Database: 2005-Mar-28
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Cranston III, WV: AUTHOR [+5]

Abstract

Disclosed is the use of an additional power switch, behind a locked door, to provide a way to assure that a computing system cannot be turned off using the easily accessible switch at the front of the system.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 59% of the total text.

Power-Off Override

      Disclosed is the use of an additional power switch, behind a
locked door, to provide a way to assure that a computing system
cannot be turned off using the easily accessible switch at the front
of the system.

      In many applications of computers to control critical
processes, it is desirable to prevent people working with and  around
the computer from turning it off, accidentally or purposely.  In such
an application, a power switch may be omitted, so that the system is
on whenever the external AC power is present, or a power switch may
be placed in a place where it is not accessible to the typical user.
For example, the switch may be mounted inside the computer or
elsewhere in a computer rack.  In some applications, it is desirable
to allow certain individuals to turn off and reset the computer,
while other individuals are prevented from doing so.  Furthermore, it
may be desirable to allow a system to be turned off and reset easily
at certain times while preventing this action at other times.  For
example, in an industrial application, it may be desired for the
operator or development programmer to be able to power off and reset
the computer easily during the development of a manufacturing
process.  During production, the same computer may be locked on to
avoid interruptions in production.

      Thus, two switches, an accessible switch and an inaccessible
switch, are wired in parallel to control the power input to a
computer....