Ericsson AVP 4000, Reference Manual, Page: 358 / 422

Glossary
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MPEG-2 Industry standard for video and audio source coding using
compression and multiplexing techniques to minimize video signal
bit rate in preparation for broadcasting. Specified in ISO/IEC 13818.
The standard is split into layers and profiles defining bit rates and
picture resolutions.
MPEG-4
Industry standard for video and audio source coding, an
improvement over MPEG-2. Specified in ISO/IEC 14496. This
product does not necessarily support all parts of the specification.
MPLS
Multi-protocol Label Switching. A Quality of Service mechanism for
IP networks that allow IP packets to flow along a predefined path in
a network, improving the reliability and robustness of the
transmission.
MPM Media Processing Module.
MPTS Multi-Program Transport Streams. Transport Streams that carry
multiple TV/Radio services.
msb Most significant bit.
Msymbol/s
(Msym/s) Mega (million) Symbols per second (10
6
Symbols per
second).
Multiplex A number of discrete data streams (typically 8 to 12), from
encoders, that are compressed together in a single DVB compliant
transport stream for delivery to a Modulator.
Multicast An IP mechanism that allows transmission of data to multiple
receivers. A multicast can also have several transmit sources
simultaneously. In video applications, multicast is typically used to
distribute a video signal from a central source to multiple
destinations.
MUSICAM
Masking pattern adapted Universal Sub-band Integrated Coding
And Multiplexing: An audio bit rate reduction system relying on sub-
band coding and psychoacoustic masking.
Mux
Multiplexer: Transmission Multiplexer: receives EMMs from the
ACC, ECMs from the BCC, video/audio data from the encoders, and
the SI stream from the SIC. It then multiplexes them all into a single
DVB-compliant transport stream, and delivers the signal to the
uplink after modulation.
The Multiplexer also contains the cipher card, which scrambles the
services according to the control words supplied by the BCC.
Network In the context of broadcasting: a collection of MPEG-2 transport
stream multiplexes transmitted on a single delivery system, for
example, all digital channels on a specific cable system.
NICAM Near Instantaneously Companded Audio Multiplex: Official name is
NICAM 728. Used for digital stereo sound broadcasting in the UK
employing compression techniques to deliver very near CD quality
audio. 728 refers to the bit rate in kbps.
NIT Network Information Table: Part of the service information data. The
NIT provides information about the physical organization of each
transport stream multiplex, and the characteristics of the network
itself (such as the actual frequencies and modulation being used).