Browse Prior Art Database

Remote Power-On Control/Power Fail Indication System

IP.com Disclosure Number: IPCOM000034360D
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 5 page(s) / 51K

Publishing Venue

IBM

Related People

Anthony, BO: AUTHOR [+2]

Abstract

This system provides the capability to remotely power up a Low End Parallel Bus system from system logic or adapter cards and be able to provide a signal to the system logic and adapters when power is dropping, as in a power failure situation. An "unattended operation" capability for computer systems is becoming more important as the proliferation of smaller systems becomes available. In many cases, these systems do not have an operator present, and there are activities that should occur at times when the system is normally powered off. One such case would be for the system to power-on and IPL itself early in the morning prior to normal working hours so that it is ready to go when the normal work shift begins.

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Remote Power-On Control/Power Fail Indication System

This system provides the capability to remotely power up a Low End Parallel Bus system from system logic or adapter cards and be able to provide a signal to the system logic and adapters when power is dropping, as in a power failure situation. An "unattended operation" capability for computer systems is becoming more important as the proliferation of smaller systems becomes available. In many cases, these systems do not have an operator present, and there are activities that should occur at times when the system is normally powered off. One such case would be for the system to power-on and IPL itself early in the morning prior to normal working hours so that it is ready to go when the normal work shift begins. Another case might be for a satellite system to be remotely accessed from a host computer system via communications lines during the nighttime when phone rates are cheaper so that orders accumulated during the day by the system can be sent to the requesting central computer. Again, the remote system would power on, IPL and start running the necessary application for communicating to the host. These two illustrations rely on two different "adapters" which are typical of adapters available for current systems but with the capability added as hereby described . The first illustration above is a time-of-day clock with an alarm comparator. The comparator logic is preloaded during some previous operating session with a value representing a future time when the system is to power up. Subsequently, the system is powered off. The time-of-day clock continues to operate, however, using battery power or power from a small control supply. When the real time of day equals the value representing the preloaded power-on time, the clock logic activates a signal which is used to remotely turn on the system. The second is a modem with an answer capability such that when a call is made, the modem detects the incoming call and activates a Ring Indicate signal to the attached computer system.

The communications adapter in the system is essentially inactive in the case when the system is powered off except for a small amount of logic, operated by battery or from a small control supply, which detects the Ring Indicate condition and activates a signal which is used to remotely turn on the system. Another capability that is of growing importance is handling of unscheduled power-down situations.

If an early warning can be communicated to some types of adapters, special action can be taken before power does drop to prevent data loss or to warn users of an impending system stoppage. The present system includes the means for such communication as part of the design. This article describes the system and adapter implementation for both remote power-on and power fail capability. When the system is not powered on, the -REMOTE_PO REQUEST signal (see the figure) on the bus is used by adapters to control the...