1117| Glossary of Terms AOS-W 6.5.3.x| User Guide
802.11d
802.11d is a wireless network communications specification for use in countries where systems using other
standards in the 802.11 family are not allowed to operate. Configuration can be fine-tuned at the Media
Access Control (MAC) layer level to comply with the rules of the country or district in which the network is to
be used. Rules are subject to variation and include allowed frequencies, allowed power levels, and allowed
signal bandwidth. 802.11d facilitates global roaming.
802.11e
802.11e is an enhancement to the 802.11a and 802.11b specifications that enhances the 802.11 Media
Access Control layer with a coordinated Time Division Multiple Access (TDMA) construct. It adds error-
correcting mechanisms for delay-sensitive applications such as voice and video. The 802.11e specification
provides seamless interoperability between business, home, and public environments such as airports and
hotels, and offers all subscribers high-speed Internet access with full-motion video, high-fidelity audio, and
VoIP.
802.11g
802.11g offers transmission over relatively short distances at up to 54 Mbps, compared with the 11 Mbps
theoretical maximum of 802.11b standard. 802.11g employs Orthogonal Frequency Division Multiplexing
(OFDM), the modulation scheme used in 802.11a, to obtain higher data speed. Computers or terminals set up
for 802.11g can fall back to speed of 11 Mbps, so that 802.11b and 802.11g devices can be compatible within
a single network.
802.11h
802.11h is intended to resolve interference issues introduced by the use of 802.11a in some locations,
particularly with military RADAR systems and medical devices. Dynamic Frequency Selection (DFS) detects the
presence of other devices on a channel and automatically switches the network to another channel if and
when such signals are detected. Transmit Power Control (TPC) reduces the radio frequency (RF) output power
of each network transmitter to a level that minimizes the risk of interference.
802.11i
802.11i provides improved encryption for networks that use 802.11a, 802.11b, and 802.11g standards. It
requires new encryption key protocols, known as Temporal Key Integrity Protocol (TKIP) and Advanced
Encryption Standard (AES).
802.11j
802.11j is a proposed addition to the 802.11 family of standards that incorporates Japanese regulatory
extensions to 802.11a; the main intent is to add channels in the radio frequency (RF) band of 4.9 GHz to 5.0
GHz.
802.11k
802.11k is an IEEE standard that enables APs and client devices to discover the best available radio resources
for seamless BSS transition in a WLAN.
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