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CDM-740 Advanced Satellite Modem
Front Panel Operation
5.4.1.6
(CONFIG:) Tx
Tx Data Rate:
Tx Symbol Rate:
To configure the Tx Data Rate (in kbps), on the top line select the digit of Data Rate to be edited
using the
◄ ►
ENTER when done.
The maximum limits for the Tx Data Rate are 16 kbps to 9.98 Mbps. The resolution is 1 bps.
The actual minimum and maximum data rates are dependent on Framing mode, Interface type,
Modulation type and FEC Code Rate. If the user changes any of the higher-priority parameters –
causing the data rate to become invalid – the Tx Data Rate is adjusted automatically. The upper
range of data rate will also be dictated by the FAST option(s) installed.
To configure the Tx Symbol Rate (in ksps), on the bottom line select the digit of Symbol Rate to
be edited using the ◄ ► arrow keys. Change the value of that digit using the
then press ENTER.
Refer to Table 5-1 for Tx Symbol Rate and Data Rate ranges (TPC).
Modulation
QPSK
8-QAM
16-QAM
5.4.1.7
(CONFIG:) Tx
Tx Scrambler: Off Normal IESS
Select Off, Normal, or IESS using the
•
When Normal is selected, the TPC scrambler is used.
•
When IESS is selected, the default ITU V.35 scrambler specified is used.
Data
9980.000 kbps
2851.429 ksps
arrow keys, then change the value of that digit using the
Table 5-1. Tx Symbol Rate / Data Rate Ranges – TPC
FEC Code
Code Rate
21/44
3/4
Turbo
7/8
0.95
3/4
Turbo
7/8
0.95
3/4
Turbo
7/8
Scrambler
Symbol Rate (Ksps)
Min
Max
16.762
2996.190
10.667
3000.000
9.143
3000.000
8.421
2982.105
7.111
3000.000
6.095
3000.000
5.614
2982.456
5.333
3000.000
4.800
2851.429
arrow keys, then press ENTER. Note the following:
◄ ►
5–8
MN-CDM740
◄►
(
E)
arrow keys. Press
▲ ▼
arrow keys,
▲ ▼
Data Rate (Kbps)
Spectral
Efficiency
Min
0.955
16.000
1.500
16.000
1.750
16.000
1.900
16.000
2.250
16.000
2.625
16.000
2.850
16.000
3.000
16.000
3.500
16.800
◄►
(
E)
Revision 0
Max
2860.000
4500.000
5250.000
5666.000
6750.000
7875.000
8500.000
9000.000
9980.000
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