Redundant data management system solves problem of operating redundant equipment in real time environment where failures are detected, isolated, and switched in simple manner. System consists of quadruply-redundant computer, input/output control units, and data buses. System inherently contains failure detection, isolation, and switching function

Hall, J. R.

English

NASA Technical Reports Server

September 1972	 B72-10589 
NASA TECH BRIEF 
Marshall Space Flight Center 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Redundant Data Management System 
A data management system designed for use in a 
major aerospace program to achieve high reliability in 
safety by using redundancy may be extended to 
commercial and industrial areas. The function of the 
system, as designed for this program, is to provide a 
data transmission and data processing service for the 
avionics equipment and associated vehicle subsystems. 
It performs all data processing on-board of the space 
vehicle with the exception of functions assigned to 
special processors for engine control and for analog 
stability augmentation. 
The redundant data management system of this 
innovation solves the problem of operating redundant 
equipment in a real time environment where failures 
are detected, isolated, and switched in a simple manner. 
The problem in the past has been solved with compli-
cated approaches which considered the amount of 
additional equipment with all possible failure modes to 
keep the redundant equipment operating in a failure 
tolerant environment. The advantage of the present 
concept is that the redundant data management system 
inherently contains the failure detection, isolation, and 
switching function. 
The system consists of quadruply-redundant com-
puters, input/output control units, and data buses. 
Centralized by the system control unit and supported by 
quadruple-redundance, failures may be detected, isolated, 
and switched automatically. 
Notes: 
1. Information concerning this innovation may be of 
interest to the aircraft industry and high speed 
ground transit agencies. 
2. Requests for further information may be directed to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Code A&PS-TU 
Marshall Space Flight Center, Alabama 35812 
Reference: B72-10589
Source: J. R. Hall of
McDonnell Douglas Corp.
under contract to

Marshall Space Flight Center
(MFS-21831) 
Category 09 
This document was prepared under the sponsorship of the National 	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned rights.
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Redundant data management system

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