802.11 wireless networks the definitive guide pdf


4 GHz “G” 802.11 wireless networks the definitive guide pdf, capable of transmitting 54 megabits per second. 6, 5, and 60 GHz frequency bands. The base version of the standard was released in 1997, and has had subsequent amendments. The standard and amendments provide the basis for wireless network products using the Wi-Fi brand.

While each amendment is officially revoked when it is incorporated in the latest version of the standard, the corporate world tends to market to the revisions because they concisely denote capabilities of their products. As a result, in the marketplace, each revision tends to become its own standard. Channel spacing within the 2. 11 family consists of a series of half-duplex over-the-air modulation techniques that use the same basic protocol.

11-1997 was the first wireless networking standard in the family, but 802. 11b was the first widely accepted one, followed by 802. 4 GHz ISM band, operating in the United States under Part 15 of the U. Federal Communications Commission Rules and Regulations.

Because of this choice of frequency band, 802. 11b and g equipment may occasionally suffer interference from microwave ovens, cordless telephones, and Bluetooth devices. 11a uses the 5 GHz U-NII band, which, for much of the world, offers at least 23 non-overlapping channels rather than the 2.

4 GHz ISM frequency band offering only three non-overlapping channels, where other adjacent channels overlap—see list of WLAN channels. 11n can use either the 2. 11ac uses only the 5 GHz band. The segment of the radio frequency spectrum used by 802.

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