ieee 802.11协议标准技术指南

<p><font face="Verdana">ieee 802.11协议标准技术指南<br/></font></p>
<p><font face="Verdana"><font face="Verdana">IEEE 802.11 Architecture<br/>Architecture Components<br/>An 802.11 LAN is based on a cellular architecture where the system is subdivided into cells, where each<br/>cell (calLED Basic Service Set or BSS, in the 802.11 nomenclature) is controlled by a Base Station (called<br/>Access Point, or in short AP).<br/>Even though that a wireless LAN may be formed by a single cell, with a single Access Point, (and as will<br/>be described later, it can also work without an Access Point), most installations will be formed by several<br/>cells, where the Access Points are connected through some kind of backbone (called Distribution System<br/>or DS), typically Ethernet, and in some cases wireless itself.<br/>The whole interconnected Wireless LAN including the different cells, their respective Access Points and<br/>the Distribution System, is seen to the upper layers of the OSI model, as a single 802 network, and is<br/>called in the Standard as Extended Service Set (ESS).<br/>The following picture shows a typical 802.11 LAN, with the components described previously:</font></p></font><br/>