Siemens EWSD System Overview 1 EWSD Application 2 EWSD hardware overview 3 digit...

代码说明：

西门子EWSD系统概述 1 EWSD 的应用 2 EWSD 硬件概述 3 数字用户线路单元(DLU)的功能结构 4 线路中继组(LTG)的功能结构 5 远端交换单元(RSU)的功能结构 6 SN 功能结构 7 协调处理机(CP)的功能结构 8 SS7 网络的功能结构 9 应用程序系统(APS) 10 EWSD 内部呼叫建立概述 -Siemens EWSD System Overview 1 EWSD Application 2 EWSD hardware overview 3 digital subscriber line unit (DLU) of the functional structure of 4-line relay group (LTG) the function of the structure of 5 remote exchange unit (RSU) of the functional structure 6 SN functional structure 7 Coordination Processor (CP) function of the structure of 8 SS7 network functional structure 9 applications system (APS) 10 EWSD an overview of the internal call setup