Users Guide

Term Definition
802.11 An evolving family of specifications for wireless LANs developed by a
working group of the Institute of Electrical and Electronics Engineers
(IEEE). 802.11 standards use the Ethernet protocol and CSMA/CA
(carrier sense multiple access with collision avoidance) for path
sharing.
802.11a Provides specifications for wireless systems. Networks using 802.11a
operate at radio frequencies in the 5GHz band. The specification uses
a modulation scheme known as orthogonal frequency-division
multiplexing (OFDM) that is especially well suited to use in office
settings.
802.11b WLAN standard often called Wi-Fi; backward compatible with 802.11.
Instead of the phase-shift keying (PSK) modulation method historically
used in 802.11 standards, 802.11b uses complementary code keying
(CCK), which allows higher data speeds and is less susceptible to
multipath-propagation interference.
802.11d 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 layer (MAC layer) level to comply with the rules of the
country or district in which the network is to be used. Rules subject to
variation include allowed frequencies, allowed power levels, and
allowed signal bandwidth. 802.11d facilitates global roaming.
802.11e A proposed adaptation to the 802.11a and 802.11b specifications that
enhances the 802.11 Media Access Control layer (MAC layer) with a
coordinated time division multiple access (TDMA) construct, and 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 Voice
over IP (VoIP).
802.11g Offers transmission over relatively short distances at up to 54
megabits per second (Mbps), compared with the 11 Mbps theoretical
maximum of 802.11b. 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 speeds of 11 Mbps, so that 802.11b and 802.11g
devices can be compatible within a single network.
802.11h 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.
Table 264: List of terms
Dell Networking W-Series ArubaOS 6.5.x | User Guide Acronyms and Terms |
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