随着无线通信技术的迅速发展，无线模块功能日趋完善，并在很多领域得到广泛应用，如Terminal 型固定台、Phone 型固定台等。 华为GTM900 无线模块是一款双频段GSM/GPRS无线模块。它支持标准的AT命令及增强AT命令，提供丰富的语音和数据业务等功能，是高速数据传输等各种应用的理想解决方案。GTM900 使用AT 命令集，通过UART 接口与外部CPU通信，主要实现无线发送和接收、基带处理、音频处理等功能。键盘、LCD等外部设备由外部CPU进行控制。本文介绍了GSM/GPRS知识，GTM900无线模块知识及GTM900套件的软件演示。具体介绍了GSM系统、GPRS系统组成及其业务理论知识；介绍了GTM900无线模块各部分组成电路，其接口信号特性，电器特性及使用方法。给出了GTM900套件演示软件的功能及其使用方法。最后附有演示软件源码，GTM900 无线模块硬件原理图和PCB板图。
译文如下：
With the wireless telecommunication technology developing quickly, wireless module features gradually matured, and are widely used in many areas,such as.Huawei GTM900 wireless module is a dual-band GSM / GPRS wireless module. It supports the standard AT command and strengthen AT command, provides rich voice and data services, and many other functions . It is a ideal solution for high-speed data transmission and other applications. GTM900 communicate with the outside CPU through UART interface use AT command sets, mainly wireless transmitte and receive, baseband processing, audio processing, and so on . Keypad, LCD, and other external equipment controled by the external CPU. This paper mainly introduced the GSM / GPRS knowledge, GTM900 wireless module and the demonstration softwar for GTM900. Specific on the GSM system、GPRS system composition and theoretical knowledge of business ; describes every part of the circuit of GTM900 wireless module , signal and electrical characteristics of interface and its use; gives the function and the use the demonstration softwar for GTM900. Finally add the source code for the demonstration softwar and the hardware schematics and PCB board plans of GTM900 wireless module.