网络释义
1)SDH(Synchronous Digital Hierarchy),同步数位阶级2)Synchronous Digital Hierarchy(SDH ),同步数位阶层3)digital cross connect Ssstem equipment(SDH-Based),同步数位阶层数位交换连接4)Digital Cross Connect System Equipment(SDH-Based),同步数位阶层数位交换连接系统设备5)optical/digital loop carrier equipment(SDH-Based),同步数位阶层光数位回路载波6)Multi-level Data Synchronization,多级数据同步
