## Validation of a fault-tolerant clock synchronization systemRicky W. Butler, Sally C. Johnson, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1984 - Technology & Engineering - 19 pages |

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actual skew Aqp(T calculated chronization clock synchronization algorithm clock value clocks q communication delay communication system compute defined design assumptions design proof determined distribution function E(eqp E(Xqp estimate experimental data failure mode fault-tolerant fault-tolerant system Figure Gini statistic histogram LAMBDA LAMBDA distribution Langley Research Center large quantiles Lemma limiting distribution max(ui maximum clock skew maximum drift rate maximum likelihood measured ments Midvalue selected mission of length msec normal distribution normalized spacings obtained order statistics p's clock perceived by processor probability of failure processor failure processor p i.e. processor's clock psys pulse random sample random variable read another processor's read error regression analysis reliability analysis select algorithm SIFT synchronization single clock read specific processor SRI International synchroniza synchronization period synchronization system synchronization task system behavior axioms system failure system parameters system reliability require testing theorem trade-off underlying distribution upper bound validation method Validation Step