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Glossary
I
IP
Internet protocol. A standard that was originally developed by the United States Department
of Defense to support the internetworking of dissimilar computers across a network. IP is
perhaps the most important of the protocols on which the Internet is based. It is the standard
that describes software that keeps track of the internetwork addresses for different nodes,
routes, and outgoing/incoming messages on a network. Some examples of IP applications
include email, chat, and Web browsers.
ITU
International Telecommunications Union.
L
LED
light-emitting diode. An electronic device that lights up when electricity passes through it.
M
MAC
media access control. The layer in the OSI model above the physical layer. It defines media
access control methods and parameters for access to the physical media.
MPEG
Motion Picture Experts Group. A joint committee of the International Standards Organization
(ISO) and the International Electrotechnical Commission (EG). This committee develops and
maintains the MPEG specification for a series of hardware and software standards designed to
reduce the storage requirements of digital video and audio. The common goal of MPEG
compression is to convert the equivalent of about 7.7 MB down to under 150 K, which
represents a compression ratio of approximately 52 to 1. Current standards are MPEG-1,
MPEG-2, and MPEG-4.
MPTS
multi-program transport stream.
P
PAT
program association table.
PCB
printed circuit board.
PID
packet identifier or program identifier.
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Troubleshooting
