Glossary
A-6
MRX4000 PLUS
Operator’s Guide/
Technical Reference Manual
LO
Local Oscillator
LOS
Loss of Signal
LPF
Low Pass Filter
LQ
Link Quality
MAC
Address
The Media Access Control (MAC) address is a
unique identification number for a network device on
a local area network (LAN) or other network. This
number (a physical address such as 00-A1-B2-C3-
D4-5F) is stored in the device's network adapter and
is used to acquire an IP address for the device.
MaxRC
Maximal Ratio Combining
Mbps
Megabits per second
MER
Modulation Error Ratio
Modulation error ratio is a measure used to quantify
the performance of a digital radio transmitter or
receiver using digital modulation, such as QAM.
MHz
Million (1,000,000) Hz
MPEG
Moving Picture Experts Group
M-QAM
M-order of Quadrature Amplitude Modulation
MRC
Microwave Radio Communications
Multipath
An unpredictable set of reflections and/or direct
waves, each with its own degree of attenuation and
delay. Due to obstacles and reflectors in the signal’s
path, transmitted signals arrive at the receive
antenna from various directions over multiple paths
at slightly different times.
MUX
Multiplexer
NC
Normally Closed (Relay or switch contacts)
N/C
No Connection
Table A-1: Useful Terms (Continued)
NICAM
Near-Instantaneous Companding and Multiplexing
NO
Normally Open (Relay or switch contacts)
NRZ
Non-Return-to-Zero (Modulation)
NTSC
National Television System Committee
Color television standard used in the US. Provides
525 horizontal lines of resolution. Not compatible with
PAL or SECAM.
Null modem
cable
An RS-232 cable designed to connect two computers
(or other data sources) together. It has male DB9
connectors on each end, to mate with the DB9
female connectors on the PCs. With a null modem
connection, the transmit and receive connections are
crosslinked so that transmit (pin 3) on one end
connects to the receive (pin 2) on the other.
The term can also be applied to similar Ethernet
cables.
Also called a “Crossover Cable”.
OB
Outside Broadcast
ODU
Outdoor Unit
OFDM
Orthogonal Frequency Division Multiplexing
OOK
On-Off Keying
PA
Power Amplifier
PAL
Phase Alternation Line
Color television standard used in many European
countries. Provides 625 horizontal lines of resolution.
Not compatible with NTSC or SECAM.
Table A-1: Useful Terms (Continued)
Summary of Contents for MRX4000 PLUS
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