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Glossary
A-5
MRX4000 PLUS
Operator’s Guide/
Technical Reference Manual
GPS
The Global Positioning System is a set of 24
satellites that are in 10,600-mile orbits above the
Earth. Owned and operated by the U.S. Department
of Defense, GPS enables people with ground
receivers to pinpoint their geographic location.
GUI
Graphic User Interface
Hashed
A visual cue on a graphical user interface consisting
of diagonal lines across the surface of a button. This
indicates that a button is not currently functional.
HD
High Definition (video)
HDB3
High Density Bipolar 3 line code format for traffic
data.
HD-SDI
High Definition Serial Data Interface
A serial communications interface operating at 1.5
Gbit/sec.
HPF
High Pass Filter
HPU
High Power Unit
H/W or HW
Hardware
Hz
Hertz
Hz is a unit of frequency of one cycle per second. Hz
replaces the earlier term of “cycles per second”
(CPS).
ICI
Inter-Carrier Interference
ICR
Inter-City Relay
ID
Identification
IDU
Indoor Unit
IF
Intermediate Frequency
IMD
Inter-Modulation Distortion
Table A-1: Useful Terms (Continued)
I/O
Input/Output
IP Address
An Internet Protocol (IP) address is a 32-bit number
(for example, 123.45.67.89 for IP version 4) or a 128-
bit number (for IP version 6) that identifies the
network device that is sending or receiving
information that is transmitted across a local area
network (LAN) or the Internet.
IRD
Integrated Receiver Decoder
IRE
1. Institute of Radio Engineers, an international
professional radio engineering association that
establishes various standards.
2. A unit of measurement, established by the IRE, in
which 1 IRE Unit =.00714 volts peak-to-peak (Vp-p)
and 140 IRE units equals 1 Vp-p.
ISI
Inter-Symbol Interference
ISO
International Standards Organization
Kbps
Kilobits per second
KHz
Kilo (1,000) Hz
LAN
Local Area Network
LBO
Line Build Out
LCD
Liquid Crystal Display
Lcl
Local
LED
Light Emitting Diode
LIU
Line Interface Unit
LMS-T
Link® Modulation System - Terrestrial
A proprietary algorithm system for modulation.
LNA
Low Noise Amplifier
LNB
Low Noise Block Downconverter
LNC
Low Noise Converter
Table A-1: Useful Terms (Continued)
Summary of Contents for MRX4000 PLUS
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