DMD1050TS Satellite Modem Board
Revision 1
Appendix B B–1 MN-DMD1050TS
Appendix B. Carrier Control
B.1 States
The DMD1050TS transmitter turns off the carrier output automatically when the modem finds
there is a major alarm. This prevents the carrier from outputting an unknown spectrum and
disturbing adjacent carriers. To override this automatic drop of the carrier, mask the alarm that is
causing the fault. Masking causes the modulator output spectrum to transmit, even when the fault
occurs.
These Carrier Control states are available:
• Carrier OFF
• Carrier ON
• Carrier AUTO
• Carrier VSAT
• Carrier RTS
B.2 Carrier Off
Modulator output is disabled.
B.3 Carrier On
In the user interface, turn modulator output off before reprogramming modulator functions that
can change the output spectrum. After this change, you must enter Yes to re-enable output.
When using the terminal, turn the modulator off while reprogramming modulator functions that
can change the output spectrum. After the reprogramming, you must turn the output on manually.
B.4 Carrier Auto
In the user interface, turn modulator output off before reprogramming modulator functions that
can change the output spectrum. After the change, the output turns on automatically.
When using the terminal, turn the modulator off while reprogramming modulator functions that
can change the output spectrum. After the change, the output turns on automatically.
B.5 Carrier VSat
Use the interface to turn Modulator output off before reprogramming modulator functions that can
change the output spectrum. After the change, you must enter Yes to re-enable output.
When using the terminal, turn the modulator off while reprogramming modulator functions that
can change the output spectrum. After reprogramming, you must turn the output on manually.
Additionally, VSat mode disables the modulator’s output if the modem’s demodulator does not
have signal lock. When signal lock returns to the demodulator, the modem’s modulator turns the
carrier on again.
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