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| − | page: [[Cellular technology]]
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| − | ==Generations==
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| − | Significant advances in cellular technology are generally used to mark "generations" of the system.
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| − | ===First generation (1G)===
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| − | First deployed in Tokyo in 1979, 1G cellular technology transmitted analogue audio signals using 150MHz and 900MHz bands. These mobile phones were bulky, and were initially used mostly in cars.
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| − | ===Second generation (2G)===
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| − | 2G cellular technology made a significant change to this system, by changing over to a fully digital audio stream. Among the benefits of this change was the new ability to send text messages, rather than just voice calls. These messages were limited to a size of 1120 bits, which 7 bits being used for each character. This resulted in the well-recognized message limit of 160 characters. When launched, 2G supported transfer speeds of up to 9.2kbps. It used the 1.8GHz and 900MHz bands.
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| − | ==="2.5G"===
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| − | Although not a formal title, so-called "2.5G" offered significant improvements to the original 2G system. A new protocol called General Packet Radio Switching (GPRS) was responsible enabling speeds of up to 200kbps on 2G networks.
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| − | ===Third Generation (3G)===
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| − | 3G offered further performance improvements, with transfer speeds of 144kbps to 2Mbps. This used frequencies between 1.6GHz and 2.0GHz.
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| − | ===(H+)===
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| − | ===Fourth generation (4G)===
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| − | This generation utilizes frequencies between 2GHz and 8GHz, and offers speeds ranging from 100Mbps to 1Gbps.
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| − | ===Fifth generation===
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Latest revision as of 00:56, February 16, 2021
The following is personal workspace. Once content is ready, I will migrate it to the appropriate location. I may use this for any number of purposes, but generally it will be used for drafts.
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For study: [1]
Ref grouping: [2]
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