Comtech EF Data SLM-5650A Installation And Operation Manual page 356

Data Rate – Enter the receive data rate, in kbps.
Frequency – Enter the receive frequency, in MHz, in 100-Hz steps. Note that:
•
The range for 70/140 MHz operation is 52-88 MHz or 104-176 MHz.
•
The range for L-Band operation is 950-2000 MHz.
Spectrum – Use the drop-down list to select Normal or Invert. Use this to counteract frequency
converters that invert the spectrum.
Descrambler – Use the drop-down list to select (for energy dispersal):
Selection
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 demodulation 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 demodulation
type, code rate and overhead.
•
When entering an IF frequency, the M&C will check the occupied bandwidth
calculated from the data rate, demodulation 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.
Appendix E
ITU standard
Comtech EF Data Closed Network with Reed Solomon compatible (modified V.35)
Used for IESS-309 and AUPC operation
Synchronous descrambler synchronized to the Turbo block
Linkabit OM-73 modem compatibility mode
Synchronous descrambler synchronized to the Reed-Solomon
Disables descrambling
E–34
SLM-5650A Satellite Modem
Description
Revision 10
MN-SLM-5650A