User Manual

Glossary
GL-5
Cisco Aironet Wireless LAN Client Adapters Installation and Configuration Guide for Windows
OL-1394-06
R
radio channel
The frequency at which a radio operates.
range
A linear measure of the distance that a transmitter can send a signal.
receiver sensitivity
A measurement of the weakest signal a receiver can receive and still correctly translate it into data.
RF
Radio frequency. A generic term for radio-based technology.
roaming
A feature of some access points that allows users to move through a facility while maintaining an
unbroken connection to the LAN.
RP-TNC
A connector type unique to Cisco Aironet radios and antennas. Part 15.203 of the FCC rules covering
spread spectrum devices limits the types of antennas that may be used with transmission equipment. In
compliance with this rule, Cisco Aironet, like all other wireless LAN providers, equips its radios and
antennas with a unique connector to prevent attachment of non-approved antennas to radios.
RTS threshold
The packet size at which an access point issues a request to send (RTS) before sending the packet.
S
spread spectrum
A radio transmission technology that spreads the user information over a much wider bandwidth than
otherwise required in order to gain benefits such as improved interference tolerance and unlicensed
operation.
SSID
Service set identifier. A unique identifier that stations must use to be able to communicate with an
access point. The SSID can be any alphanumeric entry up to a maximum of 32 characters.
T
TKIP
Temporal Key Integrity Protocol. Also referred to as WEP key hashing. A security feature that defends
against an attack on WEP in which the intruder uses the initialization vector (IV) in encrypted packets
to calculate the WEP key. TKIP removes the predictability that an intruder relies on to determine the
WEP key by exploiting IVs.
transmit power
The power level of radio transmission.
U
unicast packets
Packets transmitted in point-to-point communication.
UNII
Unlicensed National Information Infrastructure. An FCC regulatory domain for 5-GHz wireless
devices. UNII bands are 100 MHz wide and divided into four channels when using 802.11a OFDM
modulation.