digital hierarchy meaning in English

数字层次
数字分极体系
数字分级系统, 数字体系
数字体系

Frame structure for synchronous digital hierarchy signal
同步数字体系信号的帧结构
Telecommunications - digital hierarchy - formats specifications
电信.数字层.格式规范
Telecommunications - digital hierarchy - electrical interfaces
电信.数字分层.电气接口
Synchronous digital hierarchy cross - connect sdxc
同步数字系列交叉
Lcas digital hierarchy - formats specification virtual concatenation and lcas
数字分级.格式规范

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