Comtech EF Data SLM-5650A - Manual (Page 189)

SLM-5650A Satellite Modem Revision 8
Network Processor (NP) Interface MN-SLM5650A
8–27
IBS Used for IESS-309 and AUPC operation
Turbo Synchronous scrambler synchronized to the Turbo block
Descrambler (for energy dispersal) (continued)
Select Description
OM73 Linkabit OM-73 modem compatibility mode
Synch Synchronous scrambler synchronized to the Reed-Solomon.
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.