Download e-book for kindle: 802.11 Wireless Networks: The Definitive Guide, Second by Matthew S. Gast

By Matthew S. Gast

ISBN-10: 0596100523

ISBN-13: 9780596100520

This can be a nice e-book for wireless process engineers to appreciate 802.11 a\b\g PHY and MAC. The ebook not just talks approximately theoretical stuff but additionally offers functional facets of wireless networking.

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

Example text

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. All 802 networks have both a MAC and a Physical (PHY) component. The MAC is a set of rules to determine how to access the medium and send data, but the details of transmission and reception are left to the PHY.

With all communications relayed through an access point, the basic service area corresponding to an infrastructure BSS is defined by the points in which transmissions from the access point can be received. Although the multihop transmission takes more transmission capacity than a directed frame from the sender to the receiver, it has two major advantages: An infrastructure BSS is defined by the distance from the access point. All mobile stations are required to be within reach of the access point, but no restriction is placed on the distance between mobile stations themselves.

While these services will be described in more detail later in this chapter, it is worth describing their operation at a high level. The distribution system provides mobility by connecting access points. When a frame is given to the distribution system, it is delivered to the right access point and relayed by that access point to the intended destination. The distribution system is responsible for tracking where a station is physically located and delivering frames appropriately. When a frame is sent to a mobile station, the distribution system is charged with the task of delivering it to the access point serving the mobile station.

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


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