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Get 802.11 Wireless Networks: The Definitive Guide (O'Reilly PDF

By Matthew Gast

ISBN-10: 0596001835

ISBN-13: 9780596001834

This can be a nice ebook for wireless process engineers to appreciate 802.11 a\b\g PHY and MAC. The booklet not just talks approximately theoretical stuff but in addition supplies useful elements of wireless networking.

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Read or Download 802.11 Wireless Networks: The Definitive Guide (O'Reilly Networking) PDF

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Extra info for 802.11 Wireless Networks: The Definitive Guide (O'Reilly Networking)

Sample text

5 Frame Format To meet the challenges posed by a wireless data link, the MAC was forced to adopt several unique features, not the least of which was the use of four address fields. Not all frames use all the address fields, and the values assigned to the address fields may change depending on the type of MAC frame being transmitted. Details on the use of address fields in different frame types are presented in Chapter 4. 11 MAC frame. 11. Fields are transmitted from left to right, and the most significant bits appear last.

Any frames larger than the fragmentation threshold are fragmented in an implementation-dependent way. Network administrators can change the fragmentation threshold to tune network behavior. Higher fragmentation thresholds mean that frames are delivered with less overhead, but the cost to a lost or damaged frame is much higher because more data must be discarded and retransmitted. Low fragmentation thresholds have much higher overhead, but they offer increased robustness in the face of hostile conditions.

Once a station has transmitted the first frame in a sequence, it has gained control of the channel. Any additional frames and their acknowledgments can be sent using the short interframe space, which locks out any other stations. b. Additional frames in the sequence update the NAV for the expected additional time the medium will be used. 4. Extended frame sequences are required for higher-level packets that are larger than configured thresholds. a. Packets larger than the RTS threshold must have RTS/CTS exchange.

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802.11 Wireless Networks: The Definitive Guide (O'Reilly Networking) by Matthew Gast


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