一种基于Ethernet的硬实时通信协议

分布式硬实时系统应用日益增长，网络处理硬实时消息的能力变得更加重要，Ｅｔｈｅｒｎｅｔ是一种非确定性网络，提出一种基于Ｅｔｈｅｒｎｅｔ的通信协议ＲＴＣＣ，能够向分布硬实时系统提供硬实时性能保障，而Ｅｔｈｅｒｎｅｔ硬件不需做任何修改，ＲＴＣＣ采用命令／响应多路传输和总线表方式来调度底层通信介质，很好地解决了实时通信面临的两个问题：访问仲裁过程和传输控制过程，测试结果分析表明ＲＴＣＣ具有良好的实时性能。

AN ETHERNET-BASED HARD REAL-TIME COMMUNICATION PROTOCOL

With the growing trend towards distributed hard real time systems, the ability of computer networks to handle hard real time message traffic is becoming more important. Ethernet is a kind of non deterministic network. In this paper, an Ethernet based protocol called RTCC is presented, that provides hard real time performance guarantees to distributed hard real time applications without requiring any modifications to the existing Ethernet hardware. Command/response multiplex transmission and bus table are introduced in RTCC in order to schedule the channel. So two problems that real time communication faces, an access arbitration process and a transmission control process, can be solved well. Performance measurements from experiments on a 10 Mbps Ethernet indicate that determinism of RTCC is good.