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开发和研究各类网络的互连是发展信息产业，建立和实施高速信息网络的主要技术之一。各种网络的差别集中体现在数据格式和协议规程的不同上，因此本文在对ＤＤＮ、Ｘ．２５网、帧中继基本原理和协议规程分析的基础上，对ＤＤＮ、Ｘ．２５网接入帧中继的互连过程进行讨论。并且结合大连市数据通信局的网络环境，设计了一种高速和中低速接入帧中继的互连方案，同时对整个网络互连性能进行了分析，得到了一些有价值的结论，相信对其他城市的帧中继建设会有所帮助。
Developing and researching the interconnection of various types of networks is one of the major technologies for developing the information industry and establishing and implementing high-speed information networks. The difference between various networks is mainly reflected in the different data formats and protocols, so this article on DDN, X. 25 network, based on the analysis of the basic principles of frame relay and protocols, to DDN, X. 25 network access frame relay interconnection process is discussed. Based on the network environment of Dalian Bureau of Data and Communication, this paper designs a high-speed and low-speed access frame relay interconnection scheme. At the same time, the interconnection performance of the whole network is analyzed. Some valuable conclusions are obtained. Frame relay in other cities will help.