The master communicates with the relay unit by serial communication interface and the relay unit communicates with module unit by wireless communication network.
上位机和中继单元之间采用串行口通信，中继单元和模块单元之间采用无线网路进行通信。
Network interface unit (NIU) is an interface device between the control computer and the communication network.
网络接口单元（NIU）是控制计算机与通信网络进行交互的一种接口设备。
Method for transmitting background noise information in data transmission in data frame, communication system, mobile station and network unit.
在以数据帧形式的数据传输中用于发送背景噪声信息的方法，通信系统，移动台和网络单元。
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