TANDBERG TT1260 Reference Manual page 102

Glossary
FTP
G.703
GOP
GUI
HDTV
HPA
HSYNC
HU
Hub
ICAM
IDU
IEC
IF
Interframe Coding
Intraframe Coding
IP
I-picture; I-frame
IPPV
Page A-6
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.
The ITU-T standard which defines the physical and electrical characteristics of hierarchical
digital interfaces.
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.
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.
High Definition Television.
High Power Amplifier: Used in the signal path to amplify the modulated and up-converted
broadcast signal for feeding to the uplink antenna.
Horizontal (line) SYNCs.
Height Unit
A device in a multipoint network at which branch nodes interconnect.
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.
Indoorunit
International Electrotechnical Committee.
Intermediate Frequency: Usually refers to the 70 MHz or 140 MHz output of the Modulator in
cable, satellite and terrestrial transmission applications.
Compression coding involving consecutive frames. When consecutive frames are compared,
temporal redundancy is used to remove common elements (information) and arrive at
difference information. MPEG-2 uses B and P frames, but since they are individually
incomplete and relate to other adjacent frames, they cannot be edited independently.
Compression coding involving a single frame. Redundant information is removed on a per
frame basis. All other frames are ignored. Coding of a macroblock or picture that uses
information only from that macroblock or picture. Exploits spatial redundancy by using DCT to
produce I frames; these are independent frames and can be edited.
Internet Protocol: The IP part of TCP/IP. IP implements the network layer (layer 3) of the
protocol, which contains a network address and is used to route a message to a different
network or sub-network. IP accepts packets from the layer 4 transport protocol (TCP or UDP),
adds its own header to it and delivers a datagram to the layer 2 data link protocol. It may also
break the packet into fragments to support the Maximum Transmission / Transfer Unit (MTU)
of the network.
Intracoded Picture/Frame: A picture / frame, which is coded using purely intracoding with
reference to no other field or frame information. The I frame is used as a reference for other
compression methods.
Impulse Pay Per View: One-time events, purchased at home (on impulse) using a
prearranged SMS credit line.
Reference Guide: TT1260 Contribution Receiver
ST.RE.E10100.3