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TANDBERG E5714 User Manual

Page 230

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Glossary

Page A-4

Instruction Manual: evolution 5000 E57xx DSNG and DENG Voyager Encoder

ST.TM.E10076.3

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 bit-stream, be it video, audio or other.

EMC

Electromagnetic Compatibility.

EMM

Entitlement Management Message.

Encryption

Encoding of a transmission to prevent access without the appropriate decryption equipment and authorisation.

EPG

Electronic Programme Guide: On-screen programme listing using thumbnail pictures and/or text.

Ethernet

The most widely used local area network (LAN) defined by the IEEE as the 802.3 standard. Transmission speeds
vary according to the configuration. Ethernet uses copper or fibre-optic cables.

ETS

European Telecommunications Standard.

ETSI

European Telecommunications Standards Institute.

FCC

Federal Communications Commission.

FDM

Frequency Division Multiplex: A common communication channel for a number of signals, each with its own
allotted frequency.

FEC

Forward Error Correction: A method of catching errors in a transmission. The data is processed through an
algorithm that adds extra bits and sends these with the transmitted data. The extra bits are then used at the
receiving end to check the accuracy of the transmission and correct any errors.

FFT

Fast Fourier Transformation: A fast algorithm for performing a discrete Fourier transform.

FIFO

First In, First Out: A data structure or hardware buffer from which items are taken out in the same order they
were put in. Also known as a shelf from the analogy with pushing items onto one end of a shelf so that they fall off
the other. A FIFO is useful for buffering a stream of data between a sender and receiver that are not synchronised
- i.e. they not sending and receiving at exactly the same rate.

Footprint

The area of the Earth’s surface covered by a satellite’s downlink transmission. Also (generally) the area from
which the satellite can receive uplink transmissions.

FTP

File Transfer Protocol:

A protocol used to transfer files over a TCP/IP network (Internet, UNIX, etc.). For

example, after developing the HTML pages for a Web site on a local machine, they are typically uploaded to the
Web server, using FTP. Unlike e-mail programs in which graphics and program files have to be attached, FTP is
designed to handle binary files directly and does not add the overhead of encoding and decoding the data.

G.703

The ITU-T standard which defines the physical and electrical characteristics of hierarchical digital interfaces.

GOP

Group of Pictures: MPEG video compression works more effectively by processing a number of video frames as
a block. The TANDBERG Television Encoder normally uses a 12 frame GOP; every twelfth frame is an I frame.

GUI

Graphical User Interface: The use of pictures rather than just words to represent the input and output of a
program. A program with a GUI runs under a windowing system and has a screen interface capable of displaying
graphics in the form of icons, drop-down menus and a movable pointer. The on-screen information is usually
controlled / manipulated by a mouse or keyboard.

HDTV

High Definition Television.

HPA

High Power Amplifier: Used in the signal path to amplify the modulated and up-converted broadcast signal for
feeding to the uplink antenna.

HSYNC

Horizontal (line) SYNCs.

Hub

A device in a multipoint network at which branch nodes interconnect.

ICAM

Integrated Conditional Access Module: Embedded in the IRD and responsible for descrambling, plus packet
filtering and reception. It also contains the physical interface to the subscriber’s viewing card.

IEC

International Electrotechnical Committee.

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