2G的完整形式是什么？

2G：第二代 (2G: Second Generation)

2G is an abbreviation of the "Second-Generation Cellular Network".

2G是“第二代蜂窝网络”的缩写 。

In 1991, 2G cellular networks were commercially introduced on the GSM standard in Finland by Radiolinja, which at the present, is a component of Elisa Oyj.

1991年，Radiolinja依照芬兰的GSM标准在商业上引入了2G蜂窝网络，该网络目前是Elisa Oyj的组成部分。

Three most significant advantages of 2G networks over their antecedents were that:

2G网络相对于其前身的三个最重要的优势是：

The conversations happen on phone were using digital technology converted into codes.
在电话上进行的对话是使用转换为密码的数字技术进行的。
Extensively highly well-organized use of the radio frequency spectrum allowing a large number of users as per frequency band.
无线电频谱的广泛高度组织化使用，每个频带允许大量用户。
Initiation of data services for mobile at the beginning with SMS text messages.
首先使用SMS文本消息启动移动数据服务。

2G technologies allowed a variety of networks to offer and make available services such as text messages, picture messages, and MMS (multimedia messages). The entire text messages sent over 2G are using digital technology converted into codes, enabling the transmission of data in such a way that only the anticipated or deliberate receiver can collect and read it.

2G技术允许各种网络提供和提供服务，例如文本消息，图片消息和MMS(多媒体消息)。通过2G发送的整个文本消息都使用了转换为代码的数字技术，从而以只有预期或有意的接收者才能收集和读取数据的方式进行数据传输。

After 2G was introduced; the earlier mobile wireless network systems were retroactively dubbed 1G. At the same time as radio signals on 1G networks are based on analog, radio signals on 2G networks are based on digital. Both the systems of 1G and 2G make use of digital signaling to connect the radio towers (which listen to the devices) to the rest of the mobile system.

引入2G之后；早期的移动无线网络系统被追溯称为1G。同时1G网络上的无线电信号基于模拟，而2G网络上的无线电信号基于数字。 1G和2G系统都利用数字信令将无线电塔(监听设备)连接到移动系统的其余部分。

2G puts forward a theoretical highest transfer speed of 40 kbit/s with General Packet Radio Service (GPRS). There is a theoretical highest transfer speed of 384 kbit/s with EDGE (Enhanced Data Rates for GSM Evolution).

2G提出了使用通用分组无线服务(GPRS)的理论上最高的40 kbit / s传输速度。使用EDGE(GSM演进的增强数据速率)时，理论上的最高传输速度为384 kbit / s。

The most widespread 2G technology was the time division multiple access (TDMA)-based GSM, formerly from Europe but used in the majority of the world externally out of North America. By 2010, more than 60 GSM operators were also using CDMA2000 in the 450 MHz frequency band (CDMA450).

最为广泛的2G技术是基于时分多址(TDMA)的GSM，其原产于欧洲，但在北美以外的世界大部分地区使用。到2010年，超过60个GSM运营商也在450 MHz频带(CDMA450)中使用CDMA2000。

2G演进 (2G Evolution)

2.5G (GPRS)
2.5G(GPRS)
1. 2.5G ("second and a half generation") is used to illustrate 2G-systems that have put into operation a packet-switched domain as well as to the circuit-switched domain.
2. It doesn't essentially make available more rapid service for the reason that the packaging of timeslots is used for circuit-switched data services (HSCSD) as well.
2.75G (EDGE)
2.75克(EDGE)
1. With the launch of 8PSK encoding, GPRS networks evolved and developed to EDGE networks.
2. Enhanced Data rates for GSM Evolution (EDGE), Enhanced GPRS (EGPRS), or IMT Single Carrier (IMT-SC) is a backward-compatible digital mobile phone technology that enables enhanced data transmission rates, as an expansion on top of customary GSM.

Reference: 2G Network

参考： 2G网络