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Hybrid fault diagnosability with unreliable communication links

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2 Author(s)
C. -L. Yang ; GTE Lab., Waltham, MA, USA ; G. M. Masson

Hybrid fault diagnosability in distributed multiprocessor systems is considered for the case in which, in addition to units being faulty, communication links among units can also be faulty. A hybrid fault situation is a (bounded) combination of hard and soft failing units. A novel hybrid fault diagnosability, denoted (t/ts -unit: σ-link)-diagnosability is introduced (a total of t or fewer units can be faulty with at most ts of them soft-failing; σ is the number of incorrect test outcomes caused by unreliable links)., This diagnosability is compatible with the previously known t/ts-diagnosability and can additionally tolerate up to σ incorrect test outcomes to give always-correct diagnosis for any hybrid-fault (HF)-compatible syndrome from a hybrid fault situation. It is shown that an O(|E|) algorithm, proposed originally by the authors (see ibid., vol.C-35, p.503-10, 1986) for faulty unit identification in ts-diagnosable systems, can be used to analyze a syndrome from a (ts-unit σ-link)-diagnosable system efficiently without any preclassification of the syndrome in terms of HF-compatibility. It is shown that this algorithm not only identifies all the faulty units associated with an HF-compatible syndrome but also produces nonempty, always-correct diagnosis for many HF-incompatible syndromes

Published in:

IEEE Transactions on Computers  (Volume:37 ,  Issue: 2 )