同义词
1)digital cross connect Ssstem equipment(SDH-Based),同步数位阶层数位交换连接2)Digital Cross Connect System Equipment(SDH-Based),同步数位阶层数位交换连接系统设备3)Digital Cross Connect System Equipment(SONET-Based),同步光纤网路数位交换连接系统设备4)Synchronous Digital Hierarchy(SDH ),同步数位阶层5)digital cross connectsystem equipment(SONET-Based),同步光纤网路数位交换连6)optical/digital loop carrier equipment(SDH-Based),同步数位阶层光数位回路载波
