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The IEEE-P1552 structured architecture for test systems (SATS) standards effort, is a multidimensional ATE "open system platform" packaging specification. The standard defines data/signal/power interconnect mechanical/electrical mating connector requirements and common hardware packaging form factors. Addressed are plug&play wiring panels, switchable instrument/power mezzanine (IPM) modules, high speed serial bus control, and test bus matrix functionality, that permit subelement interchangeability and interoperability. The standard's functional performance requirements are limited to mechanical engagement, connector styles/footprints, electrical pin characteristics, and pin mapping definitions. As a higher order plug&play architecture, SATS supports legacy VXIbus and PXIbus architectures as hybrid subsystem integrations.