Glossary
© 2012 Harmonic Inc.
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ProView 7000 v.2.6, Rev. E
MPEG
Moving Picture Experts Group. A joint working group of the International Standards Organization and
International Electrotechnical Committee. Some portions of the MPEG Standards have also been
prepared jointly with the ITU-T.
MPEG-2
A family of specifications developed originally for compression of studio television at
24-, 25-, and 30-Hz frame rates. The system layer has support for additional functionality, including
tolerance to errors, which makes it generally more suitable for transmission than MPEG-1.
MPEG-4
A family of specifications developed originally for video games. The original video coding specification
has been supplanted by AVC, MPEG-4 Part 10 (also known as H.264), which provides significant
compression efficiencies over MPEG-2 video coding. Also includes AAC/HE AAC audio coding
specifications.
MPTS
Multiple Program Transport Stream. Several MPEG programs multiplexed together into a single
Transport Stream.
multiplex
The ability to combine multiple signals over a single communications line or channel.
multiplexer
A function where multiple signals are combined into a single signal. A device that merges several
lower-speed transmissions into one high-speed transmission, and vice versa.
Note that multiplexing functionality is usually built into encoders.
N
NIC
Network Interface Card.
NIT
Network Information Table. This table conveys information about the physical organization of the
transport streams and the characteristics of the network. The NIT is partially documented by MPEG-2
Systems and partially by DVB/ETSI EN 300 468.
See also
NMX
The NMX Digital Service Manager provides configuration, control, monitoring, and fault management
for open digital television broadcast systems. NMX supports geographically diverse sites through a
server/client architecture, and scales to support small or large networks.
Noise level
The indication of noise in a signal, where a higher value means more noise.
NTP
Network Time Protocol. Allows you to synchronize the clock of the device with the network clock.
