7E Communications
   

Glossary Terms Beginning M

0-9 : A : B : C : D : E : F : G : H : I : J : K : L : M

N : O : P : Q : R : S : T : U : V : W : X : Y : Z

M4
Multi-Media Mini-M: INMARSAT successor to Inmarsat-B System, offering smaller sized terminals with enhanced data capabilities. Also called Global Area Network.
Magnetic
North direction towards which a compass needle will ordinarily point when influenced by the magnetic field of the Earth.
Margin
Amount of signal in dB by which the satellite system exceeds the minimum threshold required for operation.
Matrix
Switching router that can connect any input source to any output destination.
MB
Megabyte: 1 million bytes per second (1 106 bytes per second).
Mbaud
Megabaud: 1 million symbols per second (1 106 symbols per second).
Mbps
Mega-bits per second: 1 million bits per second (1 106 bits per second).
MCPC
Multiple channels per carrier.
MCR
Master control room.
MES
Mobile earth station.
MHz
Megahertz: unit of frequency equal to 1 million cycles per second or 1 106 Hz (1000 000 Hz).
Microwave
Refers to frequencies typically in the range of 2-30 GHz.
Mix-minus
The transmission to the remote location of the output of the studio minus the contribution from the remote location; see Cleanfeed.
Modem
MODulator/DEModulator: device that transmits and receives data.
Modulation rate
Modulated symbol rate.
Modulation; modulator
Process of manipulating the frequency or amplitude of a carrier in relation to a signal; device which combines a 'message' signal with a high-frequency carrier signal for transmission.
Motion JPEG
Method of using JPEG coding techniques to compress and transmit television pictures.
Mount
Mechanical assembly upon which the SNG antenna is mounted, complete with all necessary mechanical adjustment controls.
MPEG
Motion Pictures Expert Group.
MPEG-1
Video compression standard for non-interlaced, computer-type data streams. Typical MPEG-1 video compression goes up to 100:1 for images composed of 352 pixels (picture elements) 288 lines at a refresh rate of up to 30 frames per second.
MPEG-2
Standard covering the compression of data (coding and encoding) for digital television, derived from MPEG-1 and defined for interlaced broadcast TV. It provides improved picture quality, higher resolution and additional features such as scaleability.
ms
Millisecond: one thousandth of a second (1 10-3)
MSD
Medium speed data: usually for INMARSAT purposes; equivalent to a data rate of 9.6 kbps.
MSps
Mega-symbols per second: measurement of data rate - 1000 000 symbols per second (1 106 symbols per second).
MSS
Mobile-Satellite Service: ITU designation.
Multilateral
Transmission from one origin to a number of destinations simultaneously.
Multiple channels per carrier
MCPC: where multiple programme signals are combined onto one carrier signal and uplinked.
Multiplexer
Combines a number of separate signals into one signal for simultaneous transmission over a single circuit.
MUSICAM
Masking pattern adapted Universal Sub-band Integrated Coding And Multiplexing: digital audio compression standard.