知识与财富的链接
分析了3层式广域保护系统需要传输的消息种类以及各类消息对通信系统的要求,在此基础上选择了IP over ATM over SDH作为网络类型,以充分利用同步数字体系（SDH）光纤自愈环的低时延和可靠性以及异步传送模式（ATM）的服务质量（QoS）和IP的多业务支持;设计了多环网络拓扑并探讨了关键消息传输的通信协议;使用OPNET Modeler对关键信息传输进行了仿真,证实了此通信系统的有效性,仿真结果表明该通信系统可以满足最恶劣情况下的实时性和可靠性要求。
This paper analyzes the kinds of message to be transmitted in the three-level wide area protection system(WAPS)communication system and the requirements of different messages on the communication system.Accordingly,IP over ATM over SDH is chosen as the network type to make full use of the low delay and high reliability of the SDH ring,good QoS of ATM,and multiple traffic support of IP.A multi-ring topology suitable for the three-level WAPS network is designed and the communication protocols for key messages transmission are discussed.The validity of the communication network is testified by simulating key message transports using OPNET Modeler.The result of simulation indicates the network system can satisfy the real-time and reliability demands in the worst situation.
