Downlink
The part of the satellite communications circuit that extends from the
satellite to an Earth station.
Downconvert
The process by which the frequency of a broadcast transport stream
is shifted to a lower frequency range.
DPCM
Differential Pulse Code Modulation: An audio digitization technique
that codes the difference between samples rather than coding an
absolute measurement at each sample point.
DSNG
Digital Satellite News-Gathering.
DSP
Digital Signal Processor.
DTE
Data circuit Terminating Equipment: A communications device that
originates (is the source) or is the end receiving unit (destination) of
signals on a network. It is typically a terminal or computer.
DTH
Direct-To-Home. The term used to describe uninterrupted
transmission from the satellite directly to the subscriber, that is, no
intermediary cable or terrestrial network utilized.
DTMF
Dual-Tone MultiFrequency
DVB
Digital Video Broadcasting: A European project which has defined
transmission standards for digital broadcasting systems using
satellite (DVB-S), cable (DVB-C) and terrestrial (DVB-T) medium,
created by the EP-DVB group and approved by the ITU. Specifies
modulation, error correction, etc. (see EN 300 421 for satellite,
EN 300 429 for cable and EN 300 744 for terrestrial).
DVB SI
Digital Video Broadcasting Service Information.
DVB-PI
DVB-Professional Interfaces
DWDM
Dense Wavelength Division Multiplexing. A mechanism to utilize
existing fiber with even more bandwidth by adding extra signals
using other wavelengths/colors
Earth
Technical Earth: Ensures that all equipment chassis within a rack
are at the same potential, usually by connecting a wire between the
Technical earth terminal and a suitable point on the rack. This is
sometimes known as a Functional earth.
Protective Earth: Used for electric shock protection. This is
sometimes known as a safety earth.
EBU
European Broadcast Union.
ECM
Entitlement Control Message.
EDI
Ethernet Data Input
EIA
Electronics Industries Association (USA).
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