These frequency ranges, which are utilized by devices such as microwave ovens, are susceptible to interference. NCR Corporation and AT&T Corporation collaborated in 1991 to develop the forerunner to 802.11, intended for cashier systems. WaveLAN was the brand name for the earliest wireless goods. They are credited for developing Wi-Fi. Our WiFi assignment help online service can easily pass as a great source of information on WiFi, noting facts hard to find otherwise.
The Various WiFi Standards And Their Histories
802.11-1997 (802.11 legacies): The initial IEEE 802.11 standard was issued in 1997 and clarified in 1999, however it is already outdated. It defined two net bit rates of one and two megabits per second (Mbit/s), as well as forward error-correcting coding. It defined three physical layer technologies: diffuse infrared at 1 Mbit/s, frequency-hopping spread spectrum at 1 Mbit/s or 2 Mbit/s, and direct-sequence spread spectrum at 1 Mbit/s or 2 Mbit/s.
802.11b (1999): The 802.11b standard has a maximum raw data rate of 11 Mbit/s and employs the previous standard's media access technique. Because 802.11b is a direct expansion of the modulation technology stated in the original specification, 802.11b products first came on the market in early 2000.
802.11a (2012, OFDM waveform): The 802.11a standard has the same data link layer protocol and frame structure as the original standard, but it employs an OFDM-based air interface (physical layer). It runs in the 5 GHz range and has a maximum net data rate of 54 Mbit/s plus error-correcting coding, resulting in a practical net attainable throughput in the mid-20 Mbit/s.
802.11g (2003): In June 2003, a third modulation standard, 802.11g, was ratified. This operates in the 2.4 GHz range (as does 802.11b), but uses the same OFDM-based transmission technique as 802.11a. It has a maximum physical layer data rate of 54 Mbit/s, exclusive of forwarding error-correcting codes, for an average throughput of around 22 Mbit/s.Because 802.11g hardware is fully backward compatible with 802.11b gear, it suffers from legacy problems that limit throughput by 21% when compared to 802.11a.
802.11 (2007): Many of the modifications to the 1999 version of the 802.11 standards were "rolled up" in 2003 by task group TGma. REVma, sometimes known as 802.11ma, was a single document that combined eight amendments (802.11a, b, d, e, g, h, I j) with the base standard. On March 8, 2007, 802.11REVma was approved and renamed to the then-current base standard IEEE 802.11-2007.
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