Glossary Of Terms & Abbreviations - GE MDS SD Series Technical Manual
Secure, long range ip/ethernet & serial wireless transceiver
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9.0 GLOSSARY OF TERMS & ABBREVIATIONS
If you are new to digital radio systems, some of the terms used in this guide may be unfamiliar.
The following glossary explains many of these terms and will prove helpful in understanding the
operation of the transceiver.
Active Messaging — This is a mode of diagnostic gathering that may interrupt payload system
polling communications (contrast with passive messaging). Active (or intrusive) messaging is
faster than passive messaging because it is not dependent upon the RTU polling cycle.
Antenna System Gain — A figure, normally expressed in dB, representing the power increase
resulting from the use of a gain-type antenna. System losses (from the feed line and coaxial con-
nectors, for example) are subtracted from this figure to calculate the total antenna system gain.
BER — Bit Error Rate
Bit — The smallest unit of digital data, often represented by a one or a zero. Eight bits (plus
start, stop, and parity bits) usually comprise a byte.
Bits-per-second — See BPS.
BPS — Bits-per-second. A measure of the information transfer rate of digital data across a
communication channel.
Bridging — (see Ethernet Bridging)
Byte — A string of digital data usually made up of eight data bits and start, stop and parity bits.
Ckeyed — Pertains to continuously keyed Master stations (full-duplex).
CTS — Clear to Send
Decibel (dB) — A measure computed from the ratio between two signal levels. Frequently used
to express the gain (or loss) of a system.
Data Circuit-terminating Equipment — See DCE.
Data Communications Equipment — See DCE.
Data Terminal Equipment — See DTE.
dBi — Decibels referenced to an "ideal" isotropic radiator in free space. Frequently used to ex-
press antenna gain.
dBm — Decibels referenced to one milliwatt. An absolute unit used to measure signal power, as
in transmitter power output, or received signal strength.
DCE — Data Circuit-terminating Equipment (or Data Communications Equipment). In data
communications terminology, this is the "modem" side of a computer-to-modem connection.
The transceiver described in this manual is hardwired as a DCE device.
Digital Signal Processing — See DSP.
DLINK — Data Link Mode. This is a GE MDS-proprietary protocol used when the transceiver
is in diagnostics mode.
MDS 05-4864A01, Rev. I
SD Series Technical Manual
99
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