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Appendix - Alarm List
MDM9000 Satellite Modem
17.4 Modulator Alarms
Alarm Description
Modulator General This alarm is raised when there is a general modulator alarm.
• Modulator No Input Signal
• Modulator Buffer Underflow
• Modulator Buffer Overflow
• Modulator no physical layer sync alarm
• Modulator No BaseBand frame sync alarm
• Modulator DAC Failure
• Modulator No Calibration Data
Modulator No Input Signal This alarm is raised when no input signal is detected at the
input of the modulator.
Modulator No Input Frame
Sync
This alarm indicates loss of input framing on the incoming data
of the modulator.
Modulator Buffer Underflow This alarm is raised when the input data buffer to the
modulator is empty.
Modulator Buffer Overflow This alarm is raised when the input data buffer of the
modulator is full.
Modulator Synthesizer
Failure
This alarm is raised when there is a failure with a synthesizer.
It indicates a malfunction of the synthesizer hardware, which
generates the IFL carrier frequency.
The presence of this alarm suppresses the IFL transmit output
of the modulator.
• Modulator Ref synthesizer failure alarm
• Modulator LO-1 synthesizer failure alarm
• Modulator LO-2 synthesizer failure alarm
Modulator DAC Failure This alarm is raised when there is a general DAC Failure.
Modulator No Calibration
Data
This alarm is raised when there is no Calibration data
available for the modulator.
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