Appendix C. Carrier Control; States; Carrier Off; Carrier On - Comtech EF Data DMD50 Installation And Operation Manual

C.1

States

The DMD2050 transmitter will turn off the carrier output automatically when the modem
determines there is a major alarm. This is done to prevent the carrier from outputting an
unknown spectrum and possibly disturbing adjacent carriers. This automatic drop of the carrier
can be overridden by masking the alarm that is causing the fault. This will keep the modulator
output spectrum transmitting, even when the fault occurs. The following Carrier Control states
are available:


Carrier OFF



Carrier ON


Carrier AUTO

Carrier VSAT

Carrier RTS
C.2 Carrier Off
Modulator output is disabled.
C.3 Carrier On
Modulator output is turned off before reprogramming modulator functions that may alter the
output spectrum through the front panel, and the user is required to enter "Yes" to re-enable
output after the change. When using the terminal, the modulator is turned off while re-
programming modulator functions that may alter the output spectrum, and the user is required to
manually turn on the output after the reprogramming.
MN-DMD50– Revision 3

Appendix C. Carrier Control

C–1