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目前我国移动通信网的主体是全球通（ＧＳＭ）系统，ＧＳＭ系统是第２代的数字移动通信系统，目前还正处于迅速发展的时期，它是以电话业务为主设计的面向连接的系统，采用的是电路交换技术，对电话通信能提供很好的服务，但是对数据业务却有很大的限制。能提供的数据传送速率?
At present, the main body of China’s mobile communication network is the GSM (Global System Intercom) system. The GSM system is the second generation of digital mobile communication system. Currently, it is in a period of rapid development. It is a connection-oriented system designed mainly for telephone services. Is a circuit switched technology that provides good service to telephony communications but has significant limitations on data traffic. Can provide the data transfer rate?