Download 802.11 Wireless Networks: The Definitive Guide, Second by Matthew S. Gast PDF

By Matthew S. Gast

This can be a nice ebook for wireless approach engineers to appreciate 802.11 a\b\g PHY and MAC. The ebook not just talks approximately theoretical stuff but additionally supplies functional elements of wireless networking.

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Additional info for 802.11 Wireless Networks: The Definitive Guide, Second Edition

Sample text

Higher-layer connections are almost guaranteed to be interrupted. 11 supports ESS transitions only to the extent that it is relatively easy to attempt associating with an access point in the new extended service area. Maintaining higher-level connections requires support from the protocol suites in question. In the case of TCP/ IP, Mobile IP is required to seamlessly support an ESS transition. Figure 2-10 illustrates an ESS transition. Four basic service areas are organized into two extended service areas.

11 devices) know better. 11 devices are mobile; they can easily move from one part of the network to another. 11 devices on your network understand this and deliver frames to the current location of the mobile station. 11 is a member of the IEEE 802 family, which is a series of specifications for local area network (LAN) technologies. Figure 2-1 shows the relationship between the various components of the 802 family and their place in the OSI model. Figure 2-1. The IEEE 802 family and its relation to the OSI model IEEE 802 specifications are focused on the two lowest layers of the OSI model because they incorporate both physical and data link components.

11 MAC and two physical layers: a frequency-hopping spread-spectrum (FHSS) physical layer and a direct-sequence spread-spectrum (DSSS) link layer. 11 added additional physical layers. 11b hit the marketplace in 1999 and was the first mass-market PHY. 11a were released as the first edition of this book was completed. 11g is the newest physical layer on the block. 11b. Backwards compatibility is not without a price, though. 11g users. 11 is exciting precisely because of these details. 11 allows for mobile network access; in accomplishing this goal, a number of additional features were incorporated into the MAC.

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