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Integrated and Modular Systems for Commercial ... - Nonstop Systems

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lliedSignal<br />

A E R O S P A C E<br />

Real-Time Executive Module (RTEM)<br />

• Transmitter + Receivers + Message Checker:<br />

� fault-tolerant inter-channel communication<br />

• Voter:<br />

� Approximate (with deviance limit), or Boolean<br />

• Task Scheduler:<br />

� event driven, priority based, globally verified (inc. WDT)<br />

� allows wide variety of execution times & iteration rates<br />

• Synchronizer:<br />

� loose-sync (frame based), periodic resync (exchange, vote,<br />

correct local clocks = distr. FT global clock)<br />

• Fault Tolerator:<br />

� collects inputs from all error detection mechanisms (≈ 25),<br />

<strong>and</strong> generates error reports (voted)<br />

20

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