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What is the difference between 1G, 2G, 3G and 4G internet technology communications?
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日期：2024-07-31
1G systems These are the analog systems such as AMPS that grew rapidly in the 1980s and are still available today. Many metropolitan areas have a mix of 1G and 2G systems, as well as emerging 3G systems. The systems use frequency division multiplexing to ...看更多
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