同步: synchronization; synchronism ...数位: numerical digit; digit; plac ...阶层: stratum; rank; section交换: exchange; swap; interchange; ...连接: connect; fit together; link; ...系统: system设备: equipment; device; facility; ...同步数位阶层数位交换连接: digital cross connect ssstem equipment (sdh-based)同步光纤网路数位交换连接系统设备: digital cross connect system equipment (sonet-based)同步数位阶层: synchronous digital hierarchy, sdh近乎同步数位阶层: pdh; plesiochronous digital hierarchy同步数位阶层光数位回路载波机设备: optical/digital loocarrier equipment同步数位阶: lightwave/transmission system and multiplexer equipment (sdh-based)同步数位阶层光波传输系统及多工机设备: lightwave/transmission system and multiplexer equipment同步光纤网路数位交换连: digital cross connectsystem equipment (sonet-based)同步数位阶级: sdh(synchronous digital hierarchy); sdk同步数位阶层光数位回路载波: optical/digital loocarrier equipment (sdh-based)数位系统设计: design of digital system程式控制数位交换: program controlling of digital exchange数位存取及跨接系统: digital access and crossconnect system dacs非交换连接: nonswitched connection交换连接: exchange connection; switched co ection; switched connection数位: numerical digit; digit; place; digit position系统设备交换文件: system device swap file交换连接装置: switching gear