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Among the most important tasks in automotive E/E system design are ECU architecture development, network connections, and functional mapping. Bus timing and communication delays are crucial to ensure timely behavior of distributed embedded applications. A provable real-time behavior can only be achieved with base hard- and software that fully implements real-time capabilities. CAN is a proven and commonly used network technology, but has well-known disadvantages in real-time applications. Especially for questions of real-time data transmission over CAN, a priori knowledge of bus load and possible transmission delays is important. In this context, network modeling with different tools is already common practice. Several software tools are on the market to simulate CAN bus load, and techniques exist to get results which nearly match measurements in reality. One possibility is to use only cyclic/periodic messages or the clear definition of conditions for spontaneous messages.