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Operation
3.3.10.1
Modulator Faults
IF SYNTHESIZER
DATA CLOCK SYN
I CHANNEL
Q CHANNEL
AGC LEVEL
MODEM REF ACT
MODEM REF PLL
MODULE
CONFIGURATION
3.3.10.2
Demodulator Faults
CARRIER DETECT
IF SYNTHESIZER
I CHANNEL
Q CHANNEL
BER THRESHOLD
MODULE
CONFIGURATION
3.3.10.3
Transmit Interface Faults
TX DROP
TX DATA/AIS
TX CLK PLL
TX CLK ACTIVITY
TX AUDIO 1 CLIP
TX AUDIO 2 CLIP
CONFIGURATION
3–40
Modulator IF synthesizer fault.
Transmit clock synthesizer fault. Indicates the internal Voltage Controlled
Oscillator (VCO) has not locked to the incoming data clock.
I channel data activity fault.
Q channel data activity fault.
TX IF AGC level fault.
MODEM REF activity alarm.
MODEM REF PLL not locked.
Modulator module fault.
Modulator configuration fault.
Carrier detect fault. Indicates the decoder is not locked.
Demodulator IF synthesizer fault. Indicates the IF synthesizer is not
locked.
I channel activity fault. Indicates a loss of activity in the I channel of the
quadrature demodulator.
Q channel activity fault. Indicates a loss of activity in the Q channel of the
quadrature demodulator.
Secondary alarm result of the BER threshold set in the DEMOD
Configuration menu.
Demodulator/decoder module fault.
Demodulator/decoder configuration fault.
Drop interface hardware fault. Typically indicates that the drop interface
PLL is not locked (D&I only).
Data or AIS. When data fault is selected in the Interface Configuration
menu, the fault indicates a data stable condition. This indicates the data
is all 1s or 0s (i.e., data is not transitioning). When AIS is selected, the
alarm indicates the data is all 1s from customer data input to the modem.
When None is selected in the Interface Configuration menu, the TX
Data/AIS Fault/Alarm is not activated.
Note: AIS is an alarm, not a switching fault.
Transmitter phase-locked loop fault. Indicates the transmitter
Phase-Locked Loop (PLL) is not locked.
Activity detector alarm of the selected interface transmit clock. The
interface will fall back to the internal clock when this alarm is active.
IDR TX audio for channel 1 is clipped.
IDR TX audio for channel 2 is clipped.
TX interface configuration fault.
Indicates the TX interface cannot execute a programmed configuration
parameter.
SDM-300A Satellite Modem
Rev. 4
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