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CDM-Qx Satellite Modem Revision 5
Front Panel Operation MN/CDMQx.IOM
5–17
(ConfigTxCode) – TX CODE RATE
All possible choices are presented at all times. If an option is not installed
(either Hardware, or FAST) or valid, the ◄ ► arrow keys will force the
cursor to skip past the unavailable choice.
CASE RULES
5/16 Valid for BPSK and Turbo
21/44 Valid for BPSK, QPSK and Turbo
1/2 Valid for BPSK, QPSK, Viterbi, Viterbi+R-S
2/3 Valid for TCM+R-S only (8-PSK)
3/4 Valid for QPSK, 8-PSK, and 16-QAM
7/8 Valid for QPSK, 8-PSK, and 16-QAM
17/18 Valid for QPSK, 8-PSK , and Turbo
(ConfigTxData) – TX DATA RATE
In Quad Drop&Insert (QDI) mode, these data rates are read-only! The data rate
will be the sum of the tributary rates for all ports. This also will show the
calculated symbol rate and Nx64kbps (where N=001 to 124).
The overall range of data rates is from 32 to 20000 kbps. The overall range of symbol
rates is up to 10000 ksps. The minimum data rate is set to 32 kbps only for BPSK and
QPSK, and the maximum data rates are dependent on modulation type and FEC
encoder rate. If the user changes the modulation or FEC, and the currently selected
data rate can no longer be supported, the data rate will be adjusted automatically, up or
down, keeping the symbol rate constant. The bottom line of the display shows the
symbol rate, based on FEC type, modulation, FEC Code Rate, and Data Rate. The
valid ranges of data rate are shown in the following table.
Tx Data Rate: 05000.000
k
bps
Sym:02500.000ksps
Tx Code Rate: 5/16 21/44 1/2
2/3 3/4 7/8 17/18 (◄ ►)
IMPORTANT
IMPORTANT