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实现ITU－TG．797建议的PDH灵活接入系统的关键是如何构造灵活接入终端，笔者提出了一整套构成灵活接入终端的、具备交叉连接特点的模块设计方案。
Achieve ITU-TG. 797 The key to the proposed PDH flexible access system is how to construct a flexible access terminal. The author proposes a set of modular design solutions with flexible access terminals and cross-connection features.