Comtech EF Data SLM-5650A Installation And Operation Manual page 355

•
When changing Modulation Type the data rate must be set to a rate supported
by the modulation type or the change to the modulation type will not be
allowed. Some choices will only be visible if the modem is set to a compatible
mode, or if an option is installed or enabled.
•
When entering the data rate, the following interactions need to be taken into
account:
•
If the modulation type selected is 8-PSK or 16-QAM the minimum data rate
allowed is 256 kbps.
•
When changing certain parameters like modem type, the data rate will default
to 64 kbps or 256 kbps.
•
The calculated symbol rate is displayed for the user. This is helpful for
determining the occupied bandwidth required for the selected modulation
type, code rate and overhead.
•
When entering an IF frequency, the M&C will check the occupied bandwidth
calculated from the data rate, modulation type, code rate and overhead and
will not allow an IF frequency to be entered if the occupied bandwidth falls
outside of the minimum or maximum IF frequencies.
Click [Transmit Submit] to save the desired configuration settings.
Receive
FEC Type – Use the drop-down list to select:
FEC Type
Viterbi
None
Turbo
Demodulation Type – Use the drop-down list to select:
Modulation Type
BPSK
QPSK
OQPSK
8PSK
16QAM
FEC Code Rate – Use the drop-down list to select:
FEC Code Rate
Viterbi
Uncoded
Turbo
Appendix E
(standard) K = 7 convolutional encoder
(standard) Uncoded
(optional) Turbo Product Code, which is a block code
Bi Phase Shift Keying
Quadrature Phase Shift Keying
Offset Quadrature Phase Shift Keying
8 Phase Shift Keying
(optional) 16 Quadrature Amplitude Modulation
1/2, 2/3, 3/4, 5/6, or 7/8
1/1
5/16, 21/44, 3/4, 7/8, or 17/18
E–33
SLM-5650A Satellite Modem
Description
Description
Description
Revision 10
MN-SLM-5650A