China Telecom WLAN Basics and Principles Training WLAN Basics and Principles 2008-3 What is WLANWLAN is the abbreviation of Wireless LAN: based on IP, can provide high-speed data connection within a certain range; uses 2.4GHz or 5.8GHz wireless frequency (ISM frequency) for transmission, without cable restrictions; The transmission distance is tens of meters, and can reach hundreds of meters or more using special technology; WiFi is the abbreviation of Wireless Fidelity, mainly referring to the WiFi Forum organization, which is responsible for the interoperability certification of equipment (non-mandatory); 802.11 series standards, a wireless LAN standard formulated by IEEE, is mainly used to solve the wireless access between users and user terminals in local area networks. WLAN network structure Traditional wired network 802.3AP terminates the 802.11b/g protocol between the terminal and converts it to 802.3 protocol to access the traditional LAN network 802.11b/gAP terminal WLAN WLAN network structure WLANLAN Application layer TCP IP LLC 802.11 MAC 802.11 PHY LLC 802.11 MAC 802.11 PHY 802.3 MAC 802.3 PHY Application layer TCP IP LLC 802.3 MAC 802.3 PHY WLAN standard family (I) Standard number IEEE 802.11 IEEE 802.11a IEEE 802.11b IEEE 802.11d IEEE 802.11e IEEE 802.11f IEEE 802.11g IEEE 802.11h IEEE 802.11i IEEE 802.11j Responsible technical fields Physical layer and media access layer specifications Physical layer and media access layer specifications - 5.8GHz band high-speed physical layer specifications Physical layer and media access layer specifications - 2.4GHz band high-speed physical layer extension Special requirements for physical layer MAC layer enhancement - Quality of Service (QoS) Support for IEEE 802.11 Access Point Interoperability Protocol (IAPP) 2.4GHz band...
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