同步数位阶层 meaning in English

synchronous digital hierarchy, sdh

Optical digital loop carrier equipment sdh - base
同步数位阶层光数位回路载波机设备
Digital cross connect system equipment sdh - base
同步数位阶层数位交换连接系统设备
Digital cross connect system equipment sdh - based
同步数位阶层数位交换连接系统设备
Optical digital loop carrier equipment sdh - based
同步数位阶层光数位回路载波机设备
Lightwave transmission system and multiplexer equipment sdh - base
同步数位阶层光波传输系统及多工机设备

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