Comtech EF Data SLM-5650B Installation And Operation Manual page 194

Selection
On
RTS
VSAT
Off
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
Selection
Viterbi (standard)
None (standard)
Turbo (optional)
Selection
BPSK
QPSK
OQPSK
8PSK
16QAM (optional)
Network Processor (NP) Interface
Request to Send. RTS is an interface signaling control. If enabled, RTS can be used to control
the output state of the modulator. Only available when using either the EIA-530 or HSSI
interface.
VSAT mode ties control of the Transmit Signal to the status of the Receiver. If the receiver is
Locked the Transmitter is Enabled. If the receiver is Unlocked the Transmitter will be disabled.
FEC Type
K=7 convolutional encoder.
Uncoded.
Turbo means Turbo Product Code, which is a block code.
Demodulation Type
Bi Phase Shift Keying
Quadrature Phase Shift Keying.
Offset Quadrature Phase Shift Keying.
8 Phase Shift Keying
16 Quadrature Amplitude Modulation.
Carrier
Description
Description
Description
8–28
SLM-5650B Satellite Modem
Revision 2
MN-SLM-5650B