User's Manual

Glossary
Glossary of Terms
Refer to the following list of terms that may be unfamiliar to you. These terms are used
throughout this document.
Term Definition
ARQ Automatic Repeat Request. The operation in which the radio
will re-send the data until it is received correctly.
bps Bits-per-second. A measure of information transfer rate of
digital data across a channel.
Decibel A measure of the ratio between two signal levels. Used to
express either loss or gain.
dBi Decibels referenced to an ideal isotropic radiator in free space.
Used to express antenna gain.
dBm Decibels referenced to 1 milliwatt. An absolute unit used to
measure signal power. Transmitter power output or received
signal strength.
DCE Data Communications Equipment. A device that receives data
in the form of digital signals at its input. The modem side of a
computer-to-modem connection.
DCD Data Carrier Detect.
DTE Data Terminal Equipment. A device that provides data in the
form of digital signals at its output. The computer side of a
computer-to-modem connection.
EIRP Effective Isotropic Radiated Power.
ISM Industrial, Scientific, or Medical band operating at 2.4 GHz.
Allows use of a radio without a license, but the equipment must
be immune to interference from other users in the band and
approved for use in the intended country.
Latency The delay between when data is received on TX until it is
output on RX.
RMA Return Material Authorization.
RTU Remote Terminal Unit. A device used in data collection.
TDMA Time Division Multi Access. A time slot multiplexing protocol
for multinode networking.
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