Advantech L-Band Satellite Modulator Especificaciones descargar pdf (Pagina 82)

Glossary

Term Description

Decoder A unit containing the electronic circuitry necessary to decode encrypted

signals. Some Decoders are separate from the receiver but in satellite TV

broadcasting, the term is often used interchangeably as a name for an

Integrated Receiver Decoder (IRD). The term IRD, or IRD / Decoder, is

usually associated with satellite TV broadcasting while Cable systems are

based on Converters or on Set-Top Boxes / Converters.

Differential Coding Method of coding using the difference between the value of a sample

and a predicted value.

DIL Dual In Line: The most common type of package for small and medium

scale integrated circuits. The pins hang vertically from the two long sides

of the rectangular package, spaced at intervals of 0.1 inch.

DIN Deutsches Institut für Normung: German Standards Institute.

Downlink The part of the satellite communications circuit that extends from the

satellite to an Earth station.

Downconverter A unit containing the electronic circuitry necessary to transform the

carrier frequency of a broadcast transport stream from a high (radio)

frequency - suitable for long-distance transmission - to a low

(intermediate) frequency - suitable for extraction of the data.

DSNG Digital Satellite News-Gathering.

DTE Data circuit Terminating Equipment: A classification of equipment used

by the RS-232 standard (and others) to identify equipment types and

their communications interface requirements. 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 utilised.

DVB Digital Video Broadcasting: A European project which defines

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. It specifies modulation, error

correction, etc. (see EN 300 421 for satellite, EN 300 429 for cable and

EN 300 744 for terrestrial).

DVB-S2 Digital Video Broadcasting – Satellite – Second Generation: An

enhanced specification to replace the DVB-S standard, developed in

2003 and ratified by ETSI (EN 302307) in March 2005. The development of

DVB-S2 coincided with the introduction of HDTV and H.264 (MPEG-4

AVC) video codecs. The system allows transmission of one or more

MPEG-2 audio/video streams, using QPSK or 8PSK or MAPSK (M-ary

amplitude and phase shift keying) modulation with concatenated

encoding.

DVB SI Digital Video Broadcasting Service Information.

DVB-PI DVB-Professional Interfaces: TTV Lan search shows – DVB Physical

Interfaces

B-4 SBM75e Series Modulator Installation and Operation Manual

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