The first generation of mobile communication systems (1g) was analog cellular system for mobile communication standard with the main voice services.
第一代移动通信系统(1g)是模拟制式的蜂窝移动通信系统，主要提供话音服务。
The cellular digital packet data(CDPD) system is a wireless packet communication system based on analog cellular telephone networks.
蜂窝数字分组数据（CDPD）系统是基于模拟蜂窝电话网的无线分组数据通信系统。
The cellular digital packet data(CDPD) system is a wireless packet communication system based on analog cellular telephone networks.
蜂窝数字分组数据（CDPD）系统是基于模拟蜂窝电话网的无线分组数据通信系统。
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