MDS 05-2708A01, Rev. B
MDS TransNET 900 I&O Guide
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GLOSSARY
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 feedline and coaxial connectors, for example) are subtracted
from this figure to calculate the total antenna system gain.
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.
Byte—A string of digital data usually made up of eight data bits and start,
stop, and parity bits.
Decibel (dB)—A measure of 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 express 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. By default, MDS TransNET 900™
transceivers are set as DCE devices.
Digital Signal Processing—See DSP.
DSP—Digital Signal Processing. In the MDS TransNET 900™ transceivers,
the DSP circuitry is responsible for the most critical real-time tasks; primarily
modulation, demodulation, and servicing of the data port.
DTE—Data Terminal Equipment. A device that provides data in the form of
digital signals at its output. Connects to the DCE device.
Equalization—The process of reducing the effects of amplitude, frequency
or phase distortion with compensating networks.
Extended Address—A user-selectable number between 0 and 31 that
identifies a group of transceivers that are part of a common sub-network. It is
recommended the Master be assigned XADDR 0 and the values of 1-31
assigned to Extension radios.
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