Ericsson AVP 1000 1RU, Справочное руководство, Страница: 402 / 508

Glossary
A-6
EN/LZT 790 0023/1 R16A
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).
EIT Event Information Table: Equipment: A component of the DVB-
Service Information (SI) stream generated within an Encoder,
containing information about events or programmes such as event
name, start time, duration, etc.
System: EIT (Present/Following) contains the name of the current
and next event. It may include an optional descriptor (synopsis)
giving brief details of content. EIT (Schedule) is used to produce a
full EPG. The EIT is the only DVB-SI table, which can be encrypted.
Elementary Stream
A generic term for a coded bitstream, be it video, audio or other.