In the next few slide we re going to look at GSM, the Global System for Mobile communications. GSM is the European standard for mobile telephony and is currently implemented in over 80 countries from Albania to Zimbabwe, with a rapidly growing

通过TA，TE发送AT指令来控制移动台(Mobile Station，MS)的功能，与GSM 网络业务进行交互。用户可以通过AT指令进行呼叫、短信、电话本、数据业务、传真等方面的控制。-Sent through the TA, TE AT commands to control the function of the mobile station (Mobile Station, MS), and to interact with the GSM network business. Throug