Comtech EF Data SLM-5650A - Manual (Page 187)

SLM-5650A Satellite Modem Revision 8
Network Processor (NP) Interface MN-SLM5650A
8–25
Frequency (MHz)
Enter the Frequency: (70/140 MHz) 52-88, 104-176 MHz (in 100 Hz steps) or (L-Band) 950-2000 MHz (in 100 Hz
steps)
Spectrum
Selection Description
Normal
Used to counteract frequency converters that invert the spectrum
Invert
Scrambler (for energy dispersal)
Selection Description
V.35 ITU standard
Modified-V.35 Comtech EF Data Closed Network with Reed Solomon compatible (modified V.35)
IBS Used for IESS-309 and AUPC operation
Turbo Synchronous scrambler synchronized to the Turbo block
OM73 Linkabit OM-73 modem compatibility mode
Synch Synchronous scrambler synchronized to the Reed-Solomon.
Off
Tx Power Level (dBm)
Enter a Power Level from –40 dBm to +10 dBm (in 0.1 dB steps).
Carrier
Selection Description
On
RTS
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
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.
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.