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Appendix D: Glossary
802.11e
tables, acceptable channels, and power levels for each country are provided. Enabling
support for IEEE 802.11d on the access point causes the AP to broadcast which country it is
operating in as a part of its beacons. Client stations then use this information. This is
particularly important for AP operation in the 5GHz IEEE 802.11a bands because use of
these 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 (
) is a standard that defines the inter access point protocol
IEEE Std. 802.11f-2003
(IAPP) for access points (wireless hubs) in an extended service set (ESS). The standard
defines how access points communicate the associations and reassociations of their mobile
stations.
802.11g
IEEE 802.11g (
) is a higher speed extension (up to 54 Mbps) to the
IEEE Std. 802.11g-2003
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. TCP 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.
Psion Teklogix 9160 G2 Wireless Gateway User Manual
D-47
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