Tdma third generation wireless - egprs - 136 at command set 时分多址联接第三代无线电通信. egprs - 135 at命令集
A gprs device , which resembles a modem with an extended at command set , must define a context using an at command before it enters data mode Gprs设备类似于拥有扩展at命令集的调制解调器,在进入数据模式之前必须使用at命令定义一个上下文。