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Complexity of distributed real-time applications such as automotive electronics has increased dramatically over the last couple of years. As a result, developing communication protocols to address real-time requirements of these applications such as reliability, in-time delivery of messages, priority support, and fault-tolerance needs more sophisticated techniques. To satisfy these requirements, special communication architectures have been designed. The most important methods presented are TDMA (time division multiple access), token ring and CAN (controller area network). Recently, a new algorithm called RDM (round data mailer) has been presented. The focus of this paper is on the studying of the round data mailer technique and evaluating its message delivery performance by making a comparison of the result of simulated RDM and CAN.