D-Link DWL-8500AP Product Manual - Page 154

D-Link Unified Access Point Administrator's Guide frequencies varies a great deal from one country to another. 802.11e IEEE 802.11e is a developing IEEE standard for MAC enhancements to support QoS. It provides a mechanism to prioritize traffic within 802.11. It defines allowed changes in the Arbitration Interframe Space, a minimum and maximum Contention Window size, and the maximum length (in kµsec) of a burst of data. IEEE 802.11e is still a draft IEEE standard (most recent version is D5.0, July 2003). A currently available subset of 802.11e is the Wireless Multimedia Enhancements (WMM) standard. 802.11f IEEE 802.11f (IEEE Std. 802.11f-2003) is a standard that defines the inter access point protocol (IAPP) for access points (wireless hubs) in an extended service set (ESS). The standard defines how access points communicate the associations and re-associations of their mobile stations. 802.11g IEEE 802.11g (IEEE Std. 802.11g-2003) is a higher speed extension (up to 54 Mbps) to the 802.11b PHY, while operating in the 2.4 GHz band. It uses orthogonal frequency division multiplexing (OFDM). It supports data rates ranging from 1 to 54 Mbps. 802.11h IEEE 802.11h is a standard used is to resolve the issue of interference which was prevalent in 802.11a. The two schemes used to minimize interference in 802.11h are Transmit Power Control (TPC) and Dynamic Frequency Selection (DFS). DFS detects other APs on the same frequency and redirects these to another channel. TPC reduces the network frequency output power of the AP, thus reducing the chance of any interference. This is a required standard in Europe, Japan, and the U.S. 802.11i IEEE 802.11i is a comprehensive IEEE standard for security in a wireless local area network (WLAN) that describes Wi-Fi Protected Access 2 (WPA2). It defines enhancements to the MAC Layer to counter the some of the weaknesses of WEP. It incorporates stronger encryption techniques than the original WiFi Protected Access (WPA), such as Advanced Encryption Standard (AES). The original WPA, which can be considered a subset of 802.11i, uses Temporal Key Integrity Protocol (TKIP) for encryption. WPA2 is backwardscompatible with products that support the original WPA IEEE 802.11i / WPA2 was finalized and ratified in June of 2004. 802.11j IEEE 802.11j standardizes chipsets that can use both the 4.9 and 5 GHz radio bands according to rules specified by the Japanese government to open both bands to indoor, outdoor and mobile wireless LAN applications. The regulations require companies to adjust the width of those channels. IEEE 802.11j allows wireless devices to reach some previously unavailable channels by taking advantage of new frequencies and operating modes. This is an attempt to mitigate the crowding on the airwaves, and has tangential relationships to IEEE 802.11h. 802.11k IEEE 802.11k is a developing IEEE standard for wireless networks (WLANs) that helps auto-manage network Channel selection, client Roaming, and Access Point (AP) utilization. 802.11k capable networks will automatically load balance network traffic across APs to improve network performance and prevent under or over-utilization of any one AP. 802.11k will eventually complement the 802.11e quality of service (QoS) standard by ensuring QoS for multimedia over a wireless link. 802.1p 802.1p is an extension of the IEEE 802 standard and is responsible for QoS provision. The primary purpose of 802.1p is to prioritize network traffic at the data link/ MAC layer. 802.1p offers the ability to filter multicast traffic to ensure it doesn't increase 154 © 2001-2008 D-Link Corporation. All Rights Reserved.