116 ACO6800+ Installation and Operation Manual
Copyright © 2009, Harris Corporation
Appendix A: Glossary
Extended Text Table (ETT): Describes the detailed descriptions of virtual
channels.
Event Information Tables (EIT): Describes 3 hours of events (TV programs,
titles, start times, etc.), including all of the virtual channels listed in the TVCT.
GPI: General Purpose Interface.
High Definition Television (HDTV): High definition television has a
resolution of approximately twice that of conventional television in both the
horizontal (H) and vertical (V) dimensions and a picture aspect ratio (H to V) of
16:9.
High Level: A range of allowed picture parameters defined by the MPEG-2
video coding specification that corresponds to high definition television.
LED: Light-Emitting Diode.
Main Level: A range of allowed picture parameters defined by the MPEG-2
video coding specification with maximum resolution equivalent to standard
definition television.
Main Profile: A subset of the syntax of the MPEG-2 video coding
specification that is supported over a large range of applications. Applications
include MP@HL (Main Profile at High Level), and MP@ML (Main Profile at
Main Level).
The Master Guide Table (MGT): Provides general information about all of the
other tables. Defines the type, size, packet identifiers, and versions for all the
other PSIP tables in this Transport Stream, except for the System Time Table
(STT).
Mbps: Megabits per second.
mV: Millivolts.
MP@HL: Main Profile at High Level.
MP@ML: Main Profile at Main Level.
MPEG: Refers to standards developed by the ISO/IEC JTC1/SC29 WG11,
Moving Picture Experts Group.
MPEG-2: Refers to ISO/IEC standards 13818-1 (Systems), 13818-2 (Video),
13818-3 (Audio), and 13818-4 (Compliance).
Network Information Table (NIT): Provides a grouping of Transport Streams
and the relevant tuning information and contains information on frequency,
code rates, modulation, polarization etc. of various programs which the decoder
can use.
Packet: Consists of a header followed by a number of contiguous bytes from an
elementary data stream. It is a layer in the system coding syntax.
Packet Identifier (PID): A unique integer value used to associate elementary
streams of a program in a single or multi-program transport stream.
Packetized Elementary Stream (PES): The data structure used to carry
elementary stream data. The packets consist of a header followed by payload
data; a stream is a series of packets that form an elementary stream and have a
single stream identification.
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