802. 11a Standard Essay

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2.3 IEEE 802.11 Common modifications. At the beginning, in 1997, there was just one standard – 802.11 with 2.4Ghz frequency band and transfer rate up to 2Mbps. Recent days we have more than 10 different and more or less popular types of 802.11 standards. Figure 3. 2.3.1 IEEE 802.11a The IEEE 802.11a standard provides data transfer rates up to 54 Mbps and was implemented in 2001. Unlike the base standard, the 802.11a specification provides for operation in a new 5 GHz frequency band. The IEEE 802.11a standard is incompatible with 802.11b or 802.11g. 2.3.2 IEEE 802.11b This standard adopted in 1999. It is not recommended to use the standard at home, as same as in corporate computing networks. The exception may be those cases when the…show more content…
Speed is 300 Mbps, Security protocols are WEP, WPA, WPA2, Security level can be declared as high. This standard was approved in 2009. 802.11n is comparable in transmission speed to the wired standards. The maximum transmission speed of the standard 802.11n is about 5 times higher than the performance of classic Wi-Fi. The increase in the transmission speed in the IEEE 802.11n standard is achieved, firstly, due to the doubling of the channel width from 20 to 40 MHz, and secondly, due to the implementation of MIMO technology. MIMO (Multiple Input Multiple Output) technology involves the use of multiple transmit and receive antennas. (Mitchell, 2017) 2.3.4 IEEE 802.11ac/ad Kldhflskdjhflskjhfdlskjdhflksjdhflksjhdflksjdhflkjshdflkjsdhf . (Triggs, 2016) 2.3.5 IEEE 802.11ah Sdkjhfksdjhflksjdhflkjsdhflksjdhflksjdhflkjsdhf. (DeLisle, 2014) 2.4 Security. Initially, to ensure security in 802.11 standard networks WEP algorithm (Wired Equivalent Privacy) was applied, including RC4 encryption algorithm with 40-bit or 104-bit key and means of key distribution between users, but in 2001 it found a basic vulnerability allowing get full access to the network for a finite (and very short time), regardless of the length of the key. Strongly not recommended for use this security mode at the moment. Therefore, in 2003, a wireless certification program called WPA (Wi-Fi Protected Access) was adopted, eliminating the drawbacks of the previous
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