Microwave Radio Communications SCM4000, Техническое справочное руководство

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Glossary A-3 SCM4000 Operator’s Guide/Tech Ref Manual
CV Composite Video
Video signal in which the chrominance (color) and
luminance (brightness) information are combined in
one signal. S-Video separates the chrominance and
luminance into individual signals.
CW Carrier Wave
DAB Digital Audio Broadcasting
dB Decibel
A logarithmic measurement of power or voltage,
applied to audio and RF signals.
dBm A unit of measurement referenced to one milliwatt.
DCC Distribution Command and Control
DCE Data Communications Equipment
A device that communicates with a DTE device. In
practical terms, the DCE is usually a modem and the
DTE device is usually a computer.
De-
emphasis Reducing the amplitude of high frequency
components of an analog audio signal. Done on the
receive end of an analog link to take out Emphasis
added on the transmit side.
DFT Discrete Fourier Transform
DMUX,
DEMUX Demultiplexer
DQPSK Differential Quadrature (Quaternary) Phase-Shift
Keying
DRL Data Return Link
Table A-1: Useful Terms (Continued)
DS3 Digital Signal 3
44.736 Mbps data rate.
DTE Data Terminal Equipment
A device that communicates with a DCE device. In
practical terms, the DTE is usually a computer and
the DCE device is usually a modem.
Duplex A channel capable of transmitting information
simultaneously in both directions.
DVB Digital Video Broadcasting
DVB-ASI Digital Video Broadcasting - Asynchronous Serial
Interface
A widely-used MPEG-2 digital transport interface.
Physically the connection is made either with optical
fiber or 75 ohm coax with a BNC connector. Interface
can support data rates up to 270 Mb/sec.
DVB-C Digital Video Broadcasting - Cable
DVB-S Digital Video Broadcasting - Satellite
DVB-T Digital Video Broadcasting - Terrestrial
E1 2.048 Mbps data rate.
E3 34.368 Mbps data rate
EIA Electronic Industries Association
An industry association that establishes various
standards.
Table A-1: Useful Terms (Continued)