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SDM-309B Satellite Modem
3.2 Monitor
The "MONITOR" level is accessible from the 'sELECT" menu. The following modem
parameters are displayed in real time when selected.
Raw_BER
Corr_BER
Eb/N0
RxSignal
* When the decoder loses lock no data is available and is so indicated.
3.3 Faults
Faults are grouped into the categories of modulator faults, demodulator faults, and
common equipment faults. The "FAULTS" level is accessible from the 'sELECT" menu.
The following lists outline the faults monitored and displayed in each group.
RF_Syn
Data_Clk
TClk_Syn
I-Channl
Q-Channl
AGC_level
Module
C_Detect
RF_Syn
Data_Clk
I-Channl
Q-Channl
Dscrambl
BER Thrshld
Module
Battery
-12 volt
+12 volt
+5 volt
Controlr
Intrface
MN/U-SDM309B Rev. #
Raw bit error rate.
* Range: <1.0E-4 to 2550E-4
Corrected bit error rate.
* Range: <1.0E-8 to>1E-3
Energy(bit)/noise ratio.
* Range: <3.2dB to>9.7dB
Receive signal level.
* Range: <-60dBm to>-30dBm
Mod_Flts - Modulator Faults
Modulator RF synthesizer fault.
Transmit data clock activity fault.
Transmit clock synthesizer fault.
I channel activity fault.
Q channel activity fault.
Automatic gain control level fault.
Modulator module fault. Typically indicates that the
modulator module is missing or will not program.
Dmd_Flts - Demodulator/Decoder Faults
Carrier detect fault. Indicates that the decoder is not locked.
Demodulator RF synthesizer fault.
Receive data clock activity fault.
I channel activity fault.
Q channel activity fault.
Descrambler activity fault.
BER Threshold fault. Indicates that the corrected BER
Threshold that is set in the "Utility" menu has been
exceeded.
Demodulator/decoder module fault. Typically indicates that
the demod/decoder module is missing or will not program.
CEQ_Flts - Common Equipment Faults
Battery fault.
Negative 12 volt power supply fault.
Plus 12 volt power supply fault.
Plus 5 volt power supply fault.
Controller fault. Typically indicates that the controller has
gone through a power on-off cycle.
Interface module fault. Typically indicates that the interface
module is missing or will not program.
External Channel Unit
C-C–25
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