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AN9829

Intersil Corporation
Part Number AN9829
Manufacturer Intersil Corporation
Description PRISM Brief Tutorial on IEEE 802.11 Wireless LANs
Published Sep 1, 2006
Detailed Description ee www.DataSheet4U.com Brief Tutorial on IEEE 802.11 Wireless LANs TM Application Note February 1999 AN9829 Author...
Datasheet PDF File AN9829 PDF File

AN9829
AN9829

Overview
ee www.
DataSheet4U.
com Brief Tutorial on IEEE 802.
11 Wireless LANs TM Application Note February 1999 AN9829 Authors: Jim Zyren and Al Petrick Introduction [ /Title (AN98 /Subject (Brief Tutorial on IEEE 802.
11 Wireless LANs) /Autho Final approval of the IEEE 802.
11 standard for wireless local area networking (WLAN) last year and rapid progress made toward higher data rates have positioned this technology to fulfill the promise of truly mobile computing.
While wired LANs have been a mainstream technology for at least fifteen years, WLANs are uncharted territory for most networking professionals.
There are some important differences worth explaining.
When considering wireless networking, some obvious questions come to mind: How can WLANs be integrated with wired infrastructure? What is the underlying radio technology How is multiple access handled? What about network security? A more common and far more and flexible configuration is that of a BSS which contains an Access Point (AP).
The main function of an AP is to form a bridge between wireless and wired LANs.
When an AP is present within a BSS, STAs do not communicate on a peer-to-peer basis.
Instead, all communications between STAs or between an STA and a wired network client go through the AP.
APs are not mobile, and form part of the wired network infrastructure.
A BSS in this configuration is said to be operating in the infrastructure mode.
The Extended Service Set (ESS) shown in Figure 2 consists of a series of BSSs (each containing an AP) connected together by means of a Distribution System (DS).
Although the DS could be any type of network (including a wireless network), it is almost invariably an Ethernet LAN.
Within an ESS, STAs can roam from one BSS to another and communicate with any mobile or fixed client in a manner which is completely transparent in the protocol stack above the MAC sublayer.
The ESS enables coverage to extend well beyond the range of a WLAN radio.
By using an ESS, seamless campu...


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