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CDM-Qx Satellite Modem
Front Panel Operation
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Using
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Tx: C N N 35
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5.7.4.3
(Info%Rx) – RX INFORMATION
The information displayed here is as follows:
Rx: 1140.000 05000.000
8P 17/18 D RX BUF +/-32k
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Transmit Frequency and Data Rate (NOTE: Due to space limitations, the
resolution of displayed frequency is limited to 1 kHz, and data rate to 10Hz),
FEC Encoder type (VIT = Viterbi, VRS=Viterbi + Reed-Solomon, TCM =
Trellis Coded + Reed-Solomon, TUR = Turbo)
Modulation Type (Q = QPSK, B = BPSK, 8P = 8-PSK, 16=16-QAM).
Code Rate (2144 = 21/44, then 5/16, 1/2, 2/3, 3/4, 7/8, 17/18)
Scrambler state (S = Scrambler on, N = Scrambler off, I=IESS-315)
Clocking Mode (INT = internal, EXT = external, LOP = loop, ELP=external loop)
Output Power level
Transmit Output State (ON = on, OF = off, EO= external off)
TSI State (I = Transmit Spectral Inversion on, N = off)
arrow keys displays the following information:
Reed-Solomon code rates (C=Comtech(220,200), E=EF Data(225,205),
I=IESS-310(219,201).
Tx Clock Inversion (N=Normal, I=Inverted).
Tx Data Inversion (N=Normal, I=Inverted).
Tx Roll-Off (α) factor (20=20% roll-off, 35=35% roll-off)
Receive Frequency and Data Rate (NOTE: Due to space limitations, the
resolution of displayed frequency is limited to 1 kHz, and data rate to 10Hz),
FEC Decoder type (VIT = Viterbi, SEQ = Sequential, VRS=Viterbi + Reed-
Solomon, SRS=Sequential + Reed Solomon, TCM = Trellis Coded + Reed-
Solomon, TUR = Turbo)
Demodulation type (Q = QPSK, B = BPSK, 8P = 8-PSK, 16=16-QAM).
Code Rate (2144 = 21/44, then 5/16, 1/2, 2/3, 3/4, 7/8, 17/18)
Descrambler state (D = Descrambler on, N = Descrambler off)
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TUR
N ▲▼
5–55
Revision 6
MN/CDMQx.IOM
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