2G：第二代 (2G: Second Generation)

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

2G是“第二代蜂窩網絡”的縮寫 。

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依照芬蘭的GSM標準在商業上引入了2G蜂窩網絡，該網絡目前是Elisa Oyj的組成部分。

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

2G網絡相對于其前身的三個最重要的優勢是：

• The conversations happen on phone were using digital technology converted into codes.

  在電話上進行的對話是使用轉換為密碼的數字技術進行的。

• Extensively highly well-organized use of the radio frequency spectrum allowing a large number of users as per frequency band.

  無線電頻譜的廣泛高度組織化使用，每個頻帶允許大量用戶。

• Initiation of data services for mobile at the beginning with SMS text messages.

  首先使用SMS文本消息啟動移動數據服務。

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技術允許各種網絡提供和提供服務，例如文本消息，圖片消息和MMS(多媒體消息)。 通過2G發送的整個文本消息都使用了轉換為代碼的數字技術，從而以只有預期或有意的接收者才能收集和讀取數據的方式進行數據傳輸。

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； 早期的移動無線網絡系統被追溯稱為1G。 同時1G網絡上的無線電信號基于模擬，而2G網絡上的無線電信號基于數字。 1G和2G系統都利用數字信令將無線電塔(監聽設備)連接到移動系統的其余部分。

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提出了使用通用分組無線服務(GPRS)的理論上最高的40 kbit / s傳輸速度。 使用EDGE(GSM演進的增強數據速率)時，理論上的最高傳輸速度為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).

最為廣泛的2G技術是基于時分多址(TDMA)的GSM，其原產于歐洲，但在北美以外的世界大部分地區使用。 到2010年，超過60個GSM運營商也在450 MHz頻帶(CDMA450)中使用CDMA2000。

2G演進 (2G Evolution)

2.5G (GPRS)

2.5G(GPRS)

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.

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)

With the launch of 8PSK encoding, GPRS networks evolved and developed to EDGE networks.

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

參考： 2G網絡

翻譯自: https://www.includehelp.com/dictionary/2g-full-form.aspx

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