Wireless networks based on 802.11 Standards with 2.4 to 5 GHz bands. Wireless network produced by IEEE 802.11. 802.11 Standards consist of modulation method. From the family of 802.11 Standards the most usable and well known protocols are 802.11b and 802.11g. First time 802.11 accept wireless network but 802.11b accepted it widely. In the beginning days the security was weak but now by modification of 802.11i which is a multi streaming technique the security has improved. The family of 802.11 standards includes 802.11c, 802.11f, 802.11h, 802.11j used for correction of previous stipulations.
The 802.11 Standards family divide each member into channels based on bands. All channels are regular in every country to perform various services. Every channel has different specifications and frequency.802.11 offering by channels but each station chooses only four or five channels to avoid overlapping and to get better result. 802.11standard have frames for the transmission of data .Through frames a station can also manage their channel and control wireless network links. The division of frames depends on specification along MAC header. There are many subfields of frames such as protocol version, type, fragment, WEP and order etc.
802.11 Standards were originally come into being in 1997 and registered in 1999.Its transfer rate is 1 or 2 Mbps. The specifications of 802.11 are three physical layers. 802.11 with direct-sequence spread spectrum was swiftly replaced and admired by 802.11b.The family of 802.11 Standards include many version to perform various functionality as following.
802.11a same as original 802.11 Standards because it uses data link layer protocol and frame are same as used in 802.11 Standards. But the basic 802.11a .It uses 5 GHz bandwidth for operation and 54 Mbp/s data range. It is a very effective when you are performing more than one task at a time and or crowded time .The signals of 802.11a fascinated more willingly by walls. This happen may occur in all solid objects due to small wavelength.
802.11b also uses the media defined by 802.11 standards It was come into view in 2000. 802.11b has the straight addition of modulation technology same as in 802.11.Mostly 802.11b suffered from the intrusion of other products. We need 2.4 GHz band to operate 802.11b.There are lots of devices operated by 2.4 GHz band in 802.11b such as Bluetooth, oven, card less phones, and monitors.
802.11g was authorized in 2003 as a third modulation device with 2.4 GHz band. It provide maximum data rate with 54Mbit/s at physical layer. 802.11ga also used to for restricted purposes to forward error and improvement codes. The hardware of 802.11g is totally compatible with 802.11b.The most inspiring feature of 802.11g is speed therefore user adapting it rapidly. The manufacturing rate is also less as compared to others. The contribution of 802.11b will diminish the data rate on the whole 802.11g network.
The amendments in 802.11 Standards are occurring with the passage of time and according to the requirement of user or network. The recent amendment in 802.11 Standards is 802.11n. It has multiple new features and MIMO but it also based on 802.11 standards. 802.11n recognized in 2009 as a final endorsement in 802.11 Standards family. All type of enterprises was previously transferred to 802.11n networks. These all enterprises based on Wi-Fi Alliance’s. Wi-Fi is a certified product for 802.11n application to make 802.11 standard families more useful and compatible to new era because WiFi fulfill the requirements of new era where no need to spend time for the arrangement of wires or cables and so on. The 802.11 standard families amend a great deal in the form of WiFi network.