Today, we are on August 2, 2011. Is, in American notation, the 08.02.11. And many have recognized the Wi - Fi, IEEE 802.11 standard code name.
Wi - Fi is a very common technology for a decade, especially since Intel is spearheading its Centrino technology in 2003. The first trials of the technology in the public date from 1999: Apple launched its AirPort technology (trade name Wi - Fi did not yet exist) with the iBook. The company used equipment to the 802 .11b standard, abandoned since. Remember that the name Wi - Fi is commercial and that the standard well officially named the IEEE802.11.
The first version of the standard is the 802.11: validated in 1997, it allowed to reach 2 Mbps in the 2.4 GHz frequency band. Little used, is found again from time to time industrial.
The version "a" of the standard has been little used in Europe, but is common in the United States. It allows to reach 54 Mbps in the 5 GHz band. It has the defect does not well cross walls, unlike the "b" of the standard version. The majority of current chips are compatible with standard 802.11 a, even though it is rarely used.
The "b" version was used in the first half of the 2000s. Able to reach 11 Mbps, it works in the 2.4 GHz band and its scope is correct. It is the standard used in the first Wi - Fi devices and the mobile first Centrino.
The "g" of the standard version is still the most used currently. It reached 54 Mbps as the 802 le 802 11 11, but has the advantage to remain compatible with 802.11 b devices. The second version of the Centrino chipset was taking support this technology. It is very used, because its bandwidth is sufficient for a classic Internet connection and production costs are very low.
The most used standard in 2011. Flows vary depending on the number of antennas and the chip, but devices are often found at 150 Mbps (entry), 300 Mbps (the classic) and 450 Mbps (high end). The standard may work in 2.4 GHz for a backwards-compatible 802. 11 b/g or 5 GHz to increase flows. some chips can use two frequencies simultaneously.
802 There is a variant of the 802.11 a 3.7 GHz band. It is primarily used in the United States for its very high reach outside, to connect buildings between them, for example.
The "ac" version is the next standard to be used in the general public. Still in draft State, it will achieve very high flow rates: 433 basis, 867 Mbps or 1 734 Mbps in advanced equipment and the best 6.93 gigabits/s in the fastest machines (with 8 antennas). This standard should be finalized during the year 2012.
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