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A Design Approach for Ultrareliable Real-Time Systems
May 1991 (vol. 24 no. 5)
pp. 12-22

A design approach developed over the past few years to formalize redundancy management and validation is described. Redundant elements are partitioned into individual fault-containment regions (FCRs). An FCR is a collection of components that operates correctly regardless of any arbitrary logical or electrical fault outside the region. Conversely, a fault in an FCR cannot cause hardware outside the region to fail. The outputs of all channels are required to agree bit-for-bit under no-fault conditions (exact bitwise consensus). Synchronization, input agreement, and input validity conditions are discussed. The Advanced Information Processing System (AIPS), which is a fault-tolerant distributed architecture based on this approach, is described. A brief overview of recent applications of these systems and current research is presented.

Citation:
Jaynarayan H. Lala, Richard E. Harper, Linda S. Alger, "A Design Approach for Ultrareliable Real-Time Systems," Computer, vol. 24, no. 5, pp. 12-22, May 1991, doi:10.1109/2.76283
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