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Serial communication by means of CAN is being used more and more for data transfer between in-vehicle control units to link components of the drive train, body electronics and mobile communication electronics. In order to design distributed electronic systems, software engineers today must not only develop the application software but also supply the communication software to handle the communication hardware, thereby reinventing the wheel with each new application software package. This procedure is inefficient as it leads to hardly reusable special solutions. To avoid incompatibilities between the modules of a distributed system a lot of additional coordination work must be done during the design phase. As a consequence, each new software package is faced with additional costs for the indispensible tests of the communication software. This paper describes a network architecture that has been designed for CAN systems.