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.
asynchronous
A form of communications that uses a start bit at the
beginning of each data word and a stop bit at the end of
each data word. It is called asynchronous because the start
of the data word can occur at any time and does not have to
be determined by a clock signal. However, once
transmission begins, the remaining bits of the data word are
sent in time to a clock signal.
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.
FHSS
Frequency Hopping Spread Spectrum. An RF transmission
technology in which the transmitted signal “hops” from one
frequency to the next in discrete steps. The receiver must
be programmed to follow the transmitter’s frequency hops.
Copyright © Murata Manufacturing Co., Ltd. All Rights Reserved. 2012
HN-210D/X, HN-214D/X Rev. 2.0 01/13/17
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