Specifications

32 Abbreviations and Glossary
If the wired network contains a lot of APs connected to the same switch or if wireless traffic has to
be route to a common device like a WLAN controller on the wired LAN, the switch itself or the com
-
mon device may become a bottleneck.
Abbreviations and Glossary
Figure 9.
802.11a IEEE 802.11 standard for transmission rate of up to 54Mbps, operates in the
5GHz spectrum.
802.11b IEEE 802.11 standard for transmission rate of up to 11Mbps, operates in the
2.4GHz spectrum.
802.11g IEEE 802.11 standard for transmission rate of up to 54Mbps, operates in the
2.4GHz spectrum.
802.11d IEEE 802.11 standard for regulatory domains.
802.11e IEEE 802.11 standard that defines Quality of Service (QoS) for WLAN.
802.11i IEEE standard security protocol for 802.11 wireless networks that was developed
to replace the original WEP protocol.
802.11n IEEE 802.11 standard for transmission rate of up to 600 Mbps, operates in the
2.4GHz and 5GHz spectrum.
AES Advanced Encryption Standard.
AP Access Point:
a radio transceiver providing LAN connection to wireless devices.
BSS Basic Service Set
CAC Call Admission Control
CCA Clear Channel Assessment
CCMP Counter Mode with Cipher Block Chaining Message Authentication Code (CBC-
MAC) Protocol
CCKM Cisco Centralized Key Management
Channel
bonding
A mode of operation in which two channels are combined to increase perfor-
mance in some environments.
Delay spread Measure of the multipath richness of a channel. Because of multipath reflections,
the channel impulse response of a wireless channel looks like a series of pulses.
Device Man-
ager
An application that handles devices such as handsets and chargers. It exists in
two variants; one server based (delivered in an Ascom Elise product like WSG)
and one stand-alone Windows application (PDM).
DiffServ Differented Services (TOS field)
dBm Power ratio in decibels (dB) referenced to one milliwatt (mW).
DFS Dynamic Frequency Selection
DSCP Differentiated Services Code Point
DTIM Delivery Traffic Indication Message
EAP Extensible Authentication Protocol.
EAP-FAST EAP-Flexible Authentication via Secured Tunnel.
EAP-TLS EAP-Transport Layer Security.
EDCF 802.11e Enhanced Distributed Coordination Function.
ESSID Extended Service Set Identifier:
used in an infrastructure WLAN that includes an AP.
ETSI European Telecommunications Standards Institute.
FCC Federal Communications Commission.
FSL Free Space Loss.