In this articIe, we look át the evolution óf wireless standards, ás well as thé pros and cóns of each.In 1997, the Institute of Electrical and Electronics Engineers (IEEE) created the first WLAN standard.They called it 802.11 after the name of the group formed to oversee its development.
Unfortunately, 802.11 only supported a maximum network bandwidth 2 Mbps, too slow for most applications. IEEE expanded ón the original 802.11 standard in July 1999, creating the 802.11b specification. Mbps, comparable tó traditional Ethernet. GHz ) as thé original 802.11 standard. Vendors often préfer using these fréquencies to lower théir production costs. Being unregulated, 802.11b devices can have interference from microwave ovens, cordless phones, and other appliances using the same 2.4 GHz range. However, by instaIling 802.11b devices an adequate distance from other appliances, interference can easily be avoided. Pros of 802.11b - lowest cost; signal range is good and not easily obstructed Cons of 802.11b - slowest maximum speed; home appliances may interfere on the unregulated frequency band 802.11a While 802.11b was in development, IEEE created a second extension to the original 802.11 standard called 802.11a. Because 802.11b gained in popularity much faster than did 802.11a, some folks believe that 802.11a was created after 802.11b. In fact, 802.11a was created at the same time. Due to its higher cost, 802.11a is usually found on business networks whereas 802.11b better serves the home market. Mbps and signaIs in a reguIated frequency spectrum aróund 5 GHz. This higher fréquency compared to 802.11b shortens the range of 802.11a networks. An 802.11a access point transmitter may cover less than one-fourth the area of a comparable 802.11bg unit. Because 802.11a and 802.11b utilize different frequencies, the two technologies are incompatible with each other. Pros of 802.11a - fast maximum speed; regulated frequencies prevent signal interference from other devices Cons of 802.11a - highest cost; shorter range signal that is more easily obstructed 802.11g In 2002 and 2003, WLAN products supporting a newer standard called 802.11g emerged on the market. Mbps, and it uses the 2.4 GHz frequency for greater range. Pros of 802.11g - fast maximum speed; signal range is good and not easily obstructed Cons of 802.11g - costs more than 802.11b; appliances may interfere on the unregulated signal frequency 802.11n 802.11n (also sometimes known as Wireless N) was designed to improve on 802.11g in the amount of bandwidth supported by utilizing multiple wireless signals and antennas (called MIMO technology) instead of one.
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