A Scalable , Out - of - Band Diagnostics Architecture 1 for International Space Station Systems

1 U.S. Government work not protected by U.S. copyright 2 IEEEAC paper #1013, Updated October 28, 2002 Abstrac t—The computational infrastructure of the International Space Station (ISS) is a distributed system that supports multiple vehicle subsystems such as Caution and Warning, Electrical Power System and Command and Data Handling (C&DH), as well as scientific payloads of varying size and complexity. The dynamic nature of the ISS configuration coupled with the increased demand for payload support places a significant burden on the inherently resource constrained computational infrastructure of the ISS. Onboard system diagnostics applications are hosted on computers that are elements of the avionics network while ground-based diagnostic applications receive only a subset of available telemetry, down-linked via Sband communications.