two identical units that are interconnected with the remaining system in such a way that either unit can provide the required functionality


  • NOTE In an avionics system, where each unit appears with its identical backup, cross-strapped units provide all possible interconnections between them. For bus-connected systems all bus connected subsystems, components, and instruments are cross-strapped to their respective data buses. The overall system reliability of a space avionics system is significantly enhanced by cross strapping, as if one unit fails a redundant unit can take over without implying a complete switch-over to a redundant chain.
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