RLX-IH
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802.11b
Reference
Industrial Hotspot
Page 88 of 99
ProSoft Technology, Inc.
April 10, 2007
Term Definition
DTE
Data terminal equipment. A computer or terminal, for example.
dBi
Decibels referenced to an "ideal" isotropic radiator in free space;
frequently used to express antenna gain.
dBm
Decibels referenced to one milliwatt (mW); an "absolute" unit used to
measure signal power (transmitted power output or received signal
strength).
decibel (dB)
A logarithmic measure of the ratio between two signal levels, used to
express gain (or loss) in a system.
default gateway
The IP address of a network router where data is sent if the IP address
is unknown. The gateway is the computer that routes the traffic from
the local area network to other networks such as the Internet.
encryption
A method of scrambling data so that only intended viewers can
decipher and understand it.
firmware
Embedded software code that directs radio function.
full-duplex
Simultaneous two-way independent transmission in both directions
half-duplex
A circuit designed to transmit in either direction, but not in both
simultaneously.
interference
Any unwanted signal that has been transmitted at the same frequency
that the radio was designed to detect.
IP address
An identifier for a computer or device in a TCP/IP network. Networks
using the TCP/IP Protocol route messages based on the IP address of
the destination. The format of an IP address is a 32-bit numeric
address written as four numbers separated by periods. Each number
can be zero to 255. For example, 1.160.10.240 could be an IP
address.
key
A set of information, from 40 bits to as much as 256 bits, that is used
as a seed by an encryption algorithm to encrypt data.
MAC ID
A unique hexadecimal number that identifies any Ethernet device.
master radio
The root radio in a network. You must have at least one master radio
per network. For redundancy, you can assign more than one master to
a network.
RADIUS
Short for "Remote Access Dial-In User Server," this term describes a
general method for allowing network access to remote users. RADIUS
authenticates a user, specifies passwords, and specifies access rights
to network resources. Originally used for dial-in access to corporate
networks via modems, RADIUS is now part of the 802.11i standard to
control user access to wireless networks.
repeater radio
These radios help create the signal "bridges" that allow radios to
communicate as a network. A bridge is like a switch, sending data on
to its destination from the transmitting radio. If two radio antennas do
not have a line of sight between them, you can add a repeater to
extend the signal range.
simplex
A circuit capable of operating in only one direction.
subnet mask
A mask used to determine what subnet an IP address belongs to. An
IP address has two components, the network address and the host
address. For example, consider the IP address 150.215.017.009.
Assuming this is part of a Class B network, the first two numbers
(150.215) represent the Class B network address, and the second two
numbers (017.009) identify a particular host on this network.
