Based on the bus structure, some ideas from switcher and router were brought into the bus communication system: adding network layer on link layer, to improve the expansibility and performance of low-end bus-based distributed system.

• 在总线式网络的基础之上，把交换式的概念引入到总线式通信系统中，并借鉴交换机和路由器中的一些优点，在链路层的基础上加入网络层，提高低端总线分布式系统的扩展性能和通信性能。