Token Bus

　　Token Bus is a type of protocol integrating CSMA/CD and Token Ring. On the bus all the nodes transmit data using CSMA/CD protocol at beginning. When the burthen becomes lager and larger and reaches a number,the nodes become alogic circle and use Token-Ring protocol to transmit data.
　　Token Bus既令牌总线，是一个使用令牌通过接入到一个总线拓扑的局域网架构。传统的共享介质局域网的一种。