数字体系 meaning in English

digit hierarchy
digital hierarchy
mathematical system

Frame structure for synchronous digital hierarchy signal
同步数字体系信号的帧结构
Synchronous digital hierarchy bit rates
同步数字体系的比特率
Basic multiplexing structure for synchronous digital hierarchy signals
同步数字体系信号的基本复用结构
Specifications for synchronous digital hierarchy multiplex equipment
同步数字体系sdh复用设备技术要求
Pdh plesiochronous digital hierarchy
准同步数字体系

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