Ericsson SPR1100 Operations Instructions download pdf (Page 235)

Glossary

DCE Data Communications Equipment: Typically a modem. It

establishes, maintains and terminates a session on a network but in

itself is not the source (originator) or destination (end receiving unit)

of signals (e.g. a computer, see DTE). A DCE device may also

convert signals to comply with the transmission path (network)

format.

DCT Discrete Cosine Transform: A technique for expressing a waveform

as a weighted sum of cosines. Raw video data is not readily

compressible. DCT is not in itself a compression technique but is

used to process the video data so that it is compressible by an

encoder. DCT processes the picture on an 8x8-pixel block basis,

converting the data from an uncompressible X Y form (as displayed

by an oscilloscope) to a compressible frequency domain form (as

displayed by a spectrum analyzer). Can be forward DCT or inverse

DCT.

DDS

Direct Digital Synthesiser.

Decoder The 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.

Decoding Time

stamp

A field that may be present in a PES packet header that indicates

the time that an access unit is to be decoded in the system target

Decoder.

DENG

Digital Electronic News Gathering

DID

Data Identifier.

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

sample and a predicted value.

DiffServ Differentiated Services. A mechanism used on layer 3 - e.g. the IP

layer - to differentiate between traffic of various types. DiffServ is

based on the ToS field and provides a mechanism for the network to

give e.g. video traffic higher priority than other traffic (for example

Internet traffic).

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.

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.

2/1553-

FGC 101 1400 Uen B

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Ericsson SPR1100 Operations Instructions Page 235

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Ericsson SPR1100 Operations Instructions Page 235

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