9. Wireless Network Glossary
AirLive AirMax5N User’s Manual
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Preamble Type
Preamble are sent with each wireless packet transmit for transmission status. Use the long
preamble type for better compatibility. Use the short preamble type for better performance
Rate Control
Ethernet switches' function to control the upstream and downstream speed of an individual
port. Rate Control management uses "Flow Control" to limit the speed of a port. Therefore,
the Ethernet adapter must also have the flow control enabled. One way to force the
adapter's flow control on is to set a port to half-duplex mode.
RADIUS
Remote Authentication Dial-In User Service. An authentication and accounting system
used by many Internet Service Providers (ISPs). When you dial in to the ISP, you must
enter your username and password. This information is passed to a RADIUS server, which
checks that the information is correct, and then authorizes access to the ISP system.
Radius typically uses port 1812 and port 1813 for authentication and accounting port.
Though not an official standard, the RADIUS specification is maintained by a working group
of the IETF.
Receiver Sensitivity
Receiver sensitivity means how sensitive is the radio for receiving signal. In general; the
slower the transmission speed, the more sensitive the radio is. The unit for Receiver
Sensitivity is in dB; the lower the absolute value is, the higher the signal strength. For
example, -50dB is higher than -80dB.
RJ-45
Standard connectors for Twisted Pair copper cable used in Ethernet networks. Although
they look similar to standard RJ-11 telephone connectors, RJ-45 connectors can have up to
eight wires, whereas telephone connectors have only four.
Router
An IP sharing router is a device that allows multiple PCs to share one single broadband
connection using NAT technology. A wireless router is a device that combines the functions
of wireless Access Point and the IP sharing router.
