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W. Elmenreich, R. Ipp:
"Introduction to TTP/C and TTP/A";
Talk: Workshop on Time-Triggered and Real-Time Communication Systems, Manno, Switzerland (invited); 2003-12-02; in: "Proceedings of the Workshop on Time-Triggered and Real-Time Communication Systems", (2003), 9 pages.

TTP/C and TTP/A are the real-time protocols of the Time-Triggered Architecture (TTA). Both protocols use a Time-Division Multiple Access (TDMA) scheme to enable collision-free bus allocation.
TTP/C focuses on the interconnection of components in order to form a highly dependable real-time system that is sufficient for critical applications such as X-by-wire in the automotive and avionics domains. TTP/C implements a replicated bus system and a guardian that prevents babbling idiot failures.
TTP/A aims at an easy and economically integration of sensors and actuators into a network. TTP/A can be implemented on low-cost microcontrollers, which suggests each transducer having a TTP/A interface. The interface concept of TTP/A supports a modular design and an easy integration and management of transducers.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04404429