Evaluation and Comparison of the Real-Time Performance of CAN and TTCAN

This article compares CAN with TTCAN (Time Triggered CAN) by hand of their ability to react to asynchronous external events. For the evaluation the method ’Distinctness of Reaction’ is utilized which is based on an orthogonal Walsh correlation. The method measures the average latency response time and the jitter when reacting to asynchronous external events. Furthermore, the measuring procedure yields the ’frequency response’ of the communication system which allows the detection of its characteristic properties. Based on the results, a discussion is carried out which enables the derivation of interesting clues in order to plan and optimize time triggered systems.