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帧中继业务近几年在国外迅速发展。帧中继源于X．25，并将在本世纪末超过X．25成为公共数据服务的主干技术。本文比较了X．25与帧中继的协议结构，数据链路层顿结构与功能及效益分析。说明了二者的主要区别与特点及各自适用环境。
Frame relay business in recent years the rapid development in foreign countries. Frame relay originates from X. 25, and will exceed X by the end of this century. 25 becomes the backbone of public data services. This article compares X. 25 and Frame Relay protocol structure, data link layer structure and function and benefit analysis. Explain the main difference between the two and the characteristics and their respective environments.