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Glossary

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D

DVR

Short for Digital Video Recorder. See also PVR.

DVB-S

DVB digital satellite system using QPSK modulation.

DVB-T

DVB digital terrestrial television system usually using COFDM modulation.

DVB-C DVB

digital cable delivery system using QAM modulation.

DVB-H

Technical specification for bringing broadcast services to handheld
devices.

DVB

Short for Digital Video Broadcasting. Defined transmission standards for digital broadcasting systems using cable (DVB-C), satellite (DVB-S), terrestrial (DVB-T) and handheld (DVB-H) devices. See www.dvb.org

DTT

Short for Digital Terrestrial Television.

DTV

Short for Digital Televison.

DSL

Short for Digital Subscriber Line. Technology that exploits unused frequencies on copper telephone lines to transmit traffic typically at multimegabit speeds. DSL can allow voice and high-speed data to be sent simultaneously over the same line. See also ADSL, VDSL and xDSL.

DTH

Short for Direct To Home, a generic term used to describe the overall system of signal transmissions from an earth station to a satellite and then to a home satellite dish. Generally encompasses all frequency ranges including C-band, medium- and high-power Ku-bands.

Digital TV operator

The entity (company) distributing digital TV content to subscribers. Usually denoted 'operator' in Conax documentation.

DMB

Short for Digital Multimedia Broadcasting. An application of the Eureka 147 standard for the use of multimedia transmissions. Using IP streaming over DAB, it is possible to stream compressed video according to any standardised method over DAB.

DRM

Short for Digital Rights Management. System that enables secure distribution of digital content, and that prevents unauthorised access to and illegal and perfect copying of same.

DES

Short for Data Encryption Standard. A 64-bit block cipher, symmetric algorithm also known as Data Encryption Algorithm (DEA) by ANSI and DEA-1 by ISO. Widely used for over 20 years, adopted in 1976 as FIPS 46. See also AES and 3DES.

Digital signature

A digital code created with a private key. Signatures allow authentication of information by the process of signature verification. When you sign a message or a file, a program uses your private key to create a digital code that is unique to both the contents of the message and your private key. Anyone can use your public key to verify your signature

Data integrity

Ensuring that information has not been altered by unauthorised or unknown means.

Decryption

The process of turning ciphertext back to plaintext. See also encryption.

DAB

Short for Digital Audio Broadcasting.