Comtech EF Data SLM-5650B Installation And Operation Manual page 195

Selection
Viterbi
Uncoded
Turbo
Enter the Receive Data Rate (in kbps).
Enter a Frequency (70/140 MHz) 52-88, 104-176 MHz (in 100 Hz steps) or (L-Band) 950-2000 MHz (in 100 Hz
steps).
Select
Normal
Invert
Select
V.35
Modified-V.35
IBS
Turbo
OM73
Synch
Off
When changing Demodulation type the data rate must be set to a rate supported
by the demodulation type or the change to the demodulation 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 [Receive Submit] to save the desired configuration settings.
Network Processor (NP) Interface
FEC Code Rate
1/2, 2/3, 3/4, 5/6, or 7/8
1/1
5/16, 21/44, 3/4, 7/8, or 17/18
Data Rate (kbps)
Frequency (MHz)
Spectrum
Used to counteract frequency converters that invert the spectrum
Descrambler (for energy dispersal)
ITU standard
Comtech EF Data Closed Network with Reed Solomon compatible (modified V.35)
Used for IESS-309 and AUPC operation
Synchronous scrambler synchronized to the Turbo block
Linkabit OM-73 modem compatibility mode
Synchronous scrambler synchronized to the Reed-Solomon.
8–29
SLM-5650B Satellite Modem
Description
Description
Description
Revision 2
MN-SLM-5650B