网络控制的概念被扩展到了让数字交换机与数据库（称为服务控制点）和信号处理系统（智能外设）通信。
The concept of network control was extended to let digital switches communicate with databases (known as Service Control Points) and signal processing systems (Intelligent Peripherals).
系统由服务器、网络交换机、报检机、工位机、LED过程指示器、信号采集单元、检测控制单元及信号处理单元等组成。
The system is composed of server, network switching, appling section , test section LED indicator , signal acquisition section , testing and controlling section and signal processing section etc.
对于高速交换机这种元器件较多，PC B密度大，且信号速率很高的设备，信号完整性问题至关重要。
High speed switch design consists of many components, the density of PCB and the signal rate is very high. Accordingly the signal Integrity is very important.
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