Glossary
GL-4
Cisco Aironet 1400 Series Wireless Bridge Hardware Installation Guide. OL-4072-03
OL-4072-04
P
packet A basic message unit for communication across a network. A packet usually includes routing
information, data, and sometimes error-detection information.
power injector A device that supplies DC power to another device over Ethernet communication lines.
R
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.
root bridge A wireless transceiver connected to the main Ethernet network that communicates with other
wireless transceivers connected to remote Ethernet networks.
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 (also referred to as Radio Network Name). A unique identifier used to
identify a radio network and which stations must use to be able to communicate with each other
or a bridge. The SSID can be any alphanumeric entry up to 32 characters.
T
transmit power The power level of radio transmission.
U
UNII Unlicensed National Information Infrastructure—regulations for UNII devices operating in the
5.15 to 5.35 GHz and 5.725 to 5.825 GHz frequency bands.
UNII-1 Regulations for UNII devices operating in the 5.15 to 5.25 GHz frequency band.
UNII-2 Regulations for UNII devices operating in the 5.25 to 5.35 GHz frequency band.
UNII-3 Regulations for UNII devices operating in the 5.725 to 5.825 GHz frequency band.
unicast packet A single data message (packet) sent to a specific IP address.