It is proved in practice that for the data acquisition system of protective relaying testing instrument replacing the serial transmission by USB communication is imperative.
实践证明，在继电保护测试仪的数据采集系统中用usb传输取代串口传输是势在必行的。
2
Transmission without distortion, which can greatly improve the capacity and relaying distance of the optical communication system, can be realized by using optical solitons.
利用光孤立子可实现无畸变传输，大大提高光纤通信系统的容量和中继距离。
3
According to the Regulations, all relaying and transmission organs should not insert advertisements arranged by themselves.