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Appendix A
A.1 Glossary of Terms
802.11d
802.11e
802.11g
802.11h
802.11i
802.11j
802.11k
802.11m
802.11n
802.11r
726
802.11d is a wireless network communications specification for use in coun-
tries where systems using other standards in the 802.11 family are not al-
lowed 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 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 mecha-
nisms 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 subscrib-
ers high-speed Internet access with full-motion video, high-fidelity audio, and
VoIP.
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 is intended to resolve interference issues introduced by the use of
802.11a in some locations, particularly with military Radar systems and med-
ical devices. Dynamic Frequency Selection (DFS) detects the presence of
other devices on a channel and automatically switches the network to anoth-
er 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 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 is a proposed addition to the 802.11 family of standards that incorpo-
rates 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 is an IEEE standard that enables APs and client devices to discover
the best available radio resources for seamless BSS transition in a WLAN.
802.11m is an Initiative to perform editorial maintenance, corrections, im-
provements, clarifications, and interpretations relevant to documentation for
802.11 family specifications.
802.11n is a wireless networking standard to improve network throughput
over the two previous standards, 802.11a and 802.11g. With 802.11n, there
will be a significant increase in the maximum raw data rate from 54 Mbps to
600 Mbps with the use of four spatial streams at a channel width of 40 MHz.
802.11r is an IEEE standard for enabling seamless BSS transitions in a
WLAN. 802.11r standard is also referred to as Fast BSS transition.
SCALANCE W1750D CLI
Function Manual, 03/2019, C79000-G8976-C452-04
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