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关注：1
2013-05-23 12:21
求翻译：capacity and vulnerability to fraud led to the introduction of the second-generation (2G) systems in the early 1990s. A second frequency band in the 1,900-MHz region was allocated in North America to ease the congestion. The term Personal Communication System (PCS) is loosely defined and was adopted as cellular phone n是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
capacity and vulnerability to fraud led to the introduction of the second-generation (2G) systems in the early 1990s. A second frequency band in the 1,900-MHz region was allocated in North America to ease the congestion. The term Personal Communication System (PCS) is loosely defined and was adopted as cellular phone n
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2013-05-23 12:21:38
欺诈的能力和脆弱性，导致在20世纪90年代初引进的第二代（2G）系统。在1,900 MHz的地区的第二个频带被分配在北美，以纾缓交通挤塞。松散定义的个人通信系统（PCS），并通过手机网络发展到2G系统。分组交换CDPD系统是在1992年推出放大器网络的数据传输。数据分割成包，存储和语音信道空闲时的阵阵转发。其比特率是19.2 kbps的（千比特每秒）;然而，最大有效率达约14.4 kbps的扣除间接费用，并可能会降低取决于交通（布莱克2002
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2013-05-23 12:23:18
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2013-05-23 12:24:58
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2013-05-23 12:26:38
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2013-05-23 12:28:18
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