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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Callers with older-model analog cellular phones may want to upgrade to digital phones, which use a fraction of energy to transmit calls.

用户可以把模拟式的老款式手机升级成数字型电话，因为它传送时用能量的一部分。

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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。

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And it has been slow to replace analog cellular phones with more popular digital models.

FORBES: Analytic myopia

In analog cellular days every phone had an external antenna, this gave the device better range when it was communicating with the cell sites.

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The cellular telecommunications industry is entering a period of transition from aging, analog-era transmission technology to high-speed "third-generation" (3G) mobile networks.

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