Correct upfront design choices can minimize the technical issues and complexity of integrating time-critical data from disparate avionics systems and enable those systems to make decisions based on that data. A proven method is to use a design architecture based on a standards-based commercial RTOS and data distribution middleware that abstracts the need for specific knowledge about the devices generating or consuming data. Such a solution can ensure timely delivery of data across an avionics network, no matter what specific instruments are present on that network An RTOS that employs the POSIX (Portable Operating System Interface) standard provides a known and published application interface that can support changes in applications, instruments, and even the RTOS itself. Full POSIX conformance ensures that applications can be easily ported between conforming operating systems, making it possible to upgrade or change code without major changes and extensive testing to the application. Further, an RTOS that conforms to the POSIX standard can also be tested and certified according to the rigorous requirements of the POSIX standard, as defined by The Open Group, proving full API support and the most portability for customers. Avionics system integrators can have confidence in the integrity, performance, reliability, and flexibility of their software.
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