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CDM-Qx Satellite Modem Revision 5
Front Panel Operation MN/CDMQx.IOM
5–68
5.6.4.3 (InfoRx) – RX INFORMATION
The information displayed here is as follows:
Top line:
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)
Bottom line:
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)
Buffer Source (IN = internal, RX = Rx satellite, TT = Tx terrestrial)
Buffer Clocking Mode (SAT = buffer disabled, BUF = buffer enabled)
Demod Sweep Acquisition range
RSI state (I = Receive Spectral Inversion on, N = off)
Using
▲▼ arrow keys will display the following information:
Top line:
Reed-Solomon code rates (C=Comtech(220,200), E=EF Data(225,205), I=IESS-
310(219,201).
Rx Clock Inversion (N=Normal, I=Inverted).
Rx Data Inversion (N=Normal, I=Inverted).
Rx Roll-Off (α) factor (20=20% roll-off, 35=35% roll-off)
Rx: 1140.000 05000.000 TU
R
8P 17/18 D RX BUF +/-32k N ▲▼
Rx: C N N 35
▲▼