Frame structure for synchronous digital hierarchy signal
中国通信标准化协会
本标准规定了在网络节点接口（NNI）的同步数字体系（SDH）信号的帧结构。
本标准适用于SDH体制的公用电信网和专用电信网，包括网络节点接口（NNI）、具备SDH光电接口的光缆数字线路系统、数字微波系统等。
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