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A
Glossary
A-1
MRX4000 PLUS
Operator’s Guide/
Technical Reference Manual
Glossary
This section describes acronyms and abbreviations used in
communications, broadcasting, and in our products and
documentation.
Table A-1: Useful Terms
Term
Explanation
1RU
1 Rack Unit (1.75 inches in height)
1080i
1080i is a standard HDTV video mode.
1080 represents
1080
lines of vertical resolution and
the letter
i
represents “interlaced” or non-progressive
scan. 1080i usually assumes a wide screen aspect
ratio of 16:9, implying a horizontal resolution of 1920
pixels and a frame resolution of 1920 x 1080, or 2.07
million pixels.
16QAM
16-state Quadrature Amplitude Modulation
The signal (video + audio) is imposed onto the 70
MHz carrier by varying both the phase and the
amplitude of the signal while keeping the frequency
constant. There are 16 possible combinations of
phase and amplitude that can be used to carry
information.
2 FSK
2-state Frequency Shift Keying
2RU
2 Rack Unit (3.5 inches in height)
3RU
3 Rack Unit (5.25 Inches in height)
32QAM
32-state Quadrature Amplitude Modulation
The signal (video + audio) is imposed onto the 70
MHz carrier by varying both the phase and the
amplitude of the signal while keeping the frequency
constant. There are 32 possible combinations of
phase and amplitude that can be used to carry
information.
4 FSK
4-state Frequency Shift Keying
8 PSK
8-Phase Shift Keying
8QAM
8-state Quadrature Amplitude Modulation
The signal (video + audio) is imposed onto the 70
MHz carrier by varying both the phase and the
amplitude of the signal while keeping the frequency
constant. There are 8 possible combinations of
phase and amplitude that can be used to carry
information.
64QAM
64-state Quadrature Amplitude Modulation
The signal (video+audio) is imposed onto the 70 MHz
carrier by varying both the phase and the amplitude
of the signal while keeping the frequency constant.
There are 64 possible combinations of phase and
amplitude that can be used to carry information.
720p
720 represents
720
lines of vertical resolution and
the letter
p
represents non-interlaced or progressive
scan. When broadcast at 60 frames per second,
720p features the highest temporal (motion)
resolution possible under the ATSC standard.
Progressive scanning reduces the need to prevent
flicker by filtering out fine details, so spatial
(sharpness) resolution is much closer to 1080i than
the number of scan lines would suggest.
Table A-1: Useful Terms (Continued)
Summary of Contents for MRX4000 PLUS
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