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Line 15: − !badword100 − !badword10 − !badword10 − page: [[Cellular technology]] − − ==Generations== − Significant advances in cellular technology are generally used to mark "generations" of the system. − ===First generation (1G)=== − 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. − − ===Second generation (2G)=== − 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. − − ==="2.5G"=== − 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. − − ===Third Generation (3G)=== − 3G offered further performance improvements, with transfer speeds of 144kbps to 2Mbps. This used frequencies between 1.6GHz and 2.0GHz. − − ===(H+)=== − − ===Fourth generation (4G)=== − This generation utilizes frequencies between 2GHz and 8GHz, and offers speeds ranging from 100Mbps to 1Gbps. − − ===Fifth generation===
User:DavidB4/workspace (view source)
Revision as of 00:56, February 16, 2021
, 00:56, February 16, 2021removing old draft
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