clock - The source of timing signals, or the signals
themselves, which all network stations use for
Mbps - Megabits per second (Million bits per
second). A measurement for the speed of data
transmission. One megabit equals approximately 1,000,000
MCU - Multipoint Control Unit that can link
several videoconferencing systems for multipoint calls.
Message - The Layer 3 information that is passed
between CPE and SPCS for signaling.
Area (MSA) - A term used
by government agencies and other organizations. The MSA
divides the United States into 306 areas according to
population density. Cellular contracts are awarded by
MIB - Management Information Base.
Specifications which contain the format definitions of
data fields for remote management by SNMP.
MIPS - Million Instructions Per Second
MLP - Multi-layer protocol for data (in H.221).
MLP data and audio can only be placed in the first 64
kbps channel of a connection. T.120 must use the MLP or
Mobile Telephone Switching
Offices (MTSO) - A
cellular CO, for use only within the cellular network.
Interacts with cell sites.
Modem - Modulator-demodulator. Converts digital
signals to and from analog.
Modulation - The
process of manipulating the frequency or amplitude of a
carrier in relation to an incoming video, voice or data
Modulator - A
device which modulates a carrier. Modulators are found
as components in broadcasting transmitters and in
Mosquitos - Artifacts found around edges when
the coder cannot keep up with the detailed video
content. Resemble speckles.
MPEG - Motion Picture Experts Group of ISO.
Responsible for MPEG-1 and MPEG-2 standards.
MPEG-1 - Video Standard targeted at 1.5
Mbps playback on multimedia PCs.
MPEG-2 - Video Standard targeted at 2-10 Mbps
broadcast television. Will also be used for higher
Multicast - Communication between a single
sender and multiple receivers on a network.
Multimode Fiber - Optical fiber that is
designed to carry multiple light rays or modes
concurrently, each at a slightly different reflection
angle within the optical fiber core.
Multiplexing - The combining of multiple data
channels onto a single transmission medium. Any process
through which a circuit normally dedicated to a single
user can be shared by multiple users. Typically, user
data streams are interleaved on a bit or byte basis
(time division) or separated by different carrier
frequencies ( frequency division).
Multipoint - A call involving three or more
Multipoint circuit - A circuit consisting
of three or more stations connected directly
MUX - An abbreviation for multiplexer, a
device that sends multiple signals on a carrier channel
at the same time in the form of a single, complex signal
to another device that recovers the separate signals at
the receiving end.
Narrowband - Bandwidths from 64kbps to 2Mbps.
NIC - Network Interface Card. Connects a PC to a
N-ISDN - Narrowband ISDN (The ISDN currently
Network - A
group of stations (computers, telephones, or other
devices) connected by communications facilities for
exchanging information. Connection can be permanent, via
cable, or temporary, through telephone or other
communications links. The transmission medium can be
physical (i.e. fiber optic cable) or wireless (i.e.
Nodes - A point of interconnection to a
network, such as computers, printers, routers, faxes, or
Noise - Caused
by random electrical signals, which act to corrupt the
bits being transmitted. Noise can come from outside
Non-ISDN line - Any connection from a CPE to a
SPCS that is not served by D-Channel signaling.
Non-ISDN trunk - Any trunk not served by either
SS7 or D-Channel signaling.
NT1 - Network Termination 1. Network termination
equipment for ISDN BRI. A unit that provides physical
and electromagnetic termination of the U-interface
2-wire transmission line, converts between Layer 1
formats used at the U- and T- reference points, and
performs some maintenance functions. Turns a U interface
into an S/T interface. Not needed when connecting to
most digital PBXs.
NTSC - National Television Standards Committee.
Standard for broadcast television in US and Japan.
Theoretical resolution of 720X480, 30 interlaced frames
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