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Databus systems in motor vehicles allow communication between electronic control devices. Among the factors of particular interest for the development of a bus system are electromagnetic compatibility (EMC) and, especially for realtime applications, performance. This paper deals with EMC measurements conducted on a bus system for multiplex applications which is currently undergoing testing at Daimler-Benz. The second half of the paper presents a comparison of performance of ABUS and CAN data-bus protocols, these being well suited for controlling time-critical operations, in respect of data rate, bus access time, bit error probability and message priority.