Comtech EF Data SDM-100A - Manual (Page 97)

SDM-100A Satellite Modem Operation
Rev. 0 3–63
3.2.2.3.1 Modulator Faults: Type 1 Operation
Fault Description
IF Synthesizer Modulator IF synthesizer fault.
Data Clock Act Activity detector alarm of the selected interface receive clock. The
interface will fall back to the satellite clock when this fault is active.
Data Clock Syn Transmit clock synthesizer fault. Indicates the internal VCO has not
locked to the incoming data clock.
I Channel I channel data activity fault.
Q Channel Q channel data activity fault.
AGC Level TX-IF AGC level fault.
Module Modulator module fault. Typically indicates the modulator module is
missing or will not program.
3.2.2.3.2 Demodulator Faults: Type 1 Operation
Fault Description
Carrier Detect Carrier detect fault. Indicates the decoder is not locked.
IF Synthesizer Demodulator IF synthesizer fault. Indicates that the IF synthesizer is not
locked.
Data Clock Syn Receive clock synthesizer fault. Indicates the internal VCO has not
locked to the incoming data clock.
I Channel I channel activity fault. Indicates a loss of activity in the I channel of the
quadrature demodulator.
Q Channel Q channel activity fault. Indicates a loss of activity in the Q channel of the
quadrature demodulator.
Descrambler Descrambler activity alarm. Indicates a loss of activity in the
descrambler.
BER Threshold Secondary alarm result of the BER threshold set in the Demod
Configuration menu.
Module Demodulator/decoder module fault. Typically indicates that the
Demod/decoder module is missing or will not program.
3.2.2.3.3 Common Equipment Faults: Type 1 Operation
Fault Description
Battery/Clock Battery or clock fault.
-12V Supply -12V power supply fault.
+12V Supply +12V power supply fault.
+5V Supply +5V power supply fault.
Controller Controller fault. Typically indicates the controller has gone through a
power on-off cycle.
Interface Module Interface module fault. Typically indicates that the interface module is
missing or will not program.