Abstract: The communication subnets in traditional Integrated Avionics Systems(IAS) are managed (controlled) by application processors and it becomes the performance bottleneck of the IAS. This paper presents the design and implementation of a IAS communication subnet-1553BCN, which is based on MIL-STD-1553B(management) and its fault-tolerant degradation. In support of the communication requirements of IAS application, a kind of acknowledged length-variable message passing service is provided, which implements the communication reliability semantics of "exactly once". Experiments have shown that the 1553BCN satisfies the communication requirements of the IAS quite well. It is suggested that the 1553BCN can be used to construct the new generation IAS.

Key words: communication Subnet, MIL-STD-1553B Bus, integrated Avionics, bus Interface