Bologna 05 february 1996

RELIABILITY AND REDUNDANCY IN COMPLEX DIGITAL SYSTEM:

AN OVERVIEW

I.D'Antone, Istituto Nazionale di Fisica Nucleare 
Via Berti Pichat 6/2, 40127 Bologna Italy

ABSTRACT

The electronics for aerospace missions, for example in the AMS experiment for the search of the universe antimatter, must be designed with techniques of fault tolerance that can improve the system reliability. The choice of the system architecture depends on the compromise between a sufficient reliability and a not excessive redundancy that would increase too much the weight. In this report quantitative methods for evaluating fault-tolerant systems are described. The concepts of failure rate and reliability function are introduced for series and parallel systems. Moreover the redundancy is described with examples, where it can take one of several forms: hardware redundancy, software redundancy, information redundancy and time redundancy. Furthermore all the redundancy techniques are compared and finally a sample design, which contains most of the redundancy concepts, is illustrated.

To have more informations contact :
Email: dantone@bo.infn.it

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