Specifications
SDM-309B Satellite Modem External Channel Unit
MN/U-SDM309B Rev. # C-C–25
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 Raw bit error rate.
* Range: <1.0E-4 to 2550E-4
Corr_BER Corrected bit error rate.
* Range: <1.0E-8 to>1E-3
Eb/N0 Energy(bit)/noise ratio.
* Range: <3.2dB to>9.7dB
RxSignal Receive signal level.
* Range: <-60dBm to>-30dBm
* 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.
Mod_Flts - Modulator Faults
RF_Syn Modulator RF synthesizer fault.
Data_Clk Transmit data clock activity fault.
TClk_Syn Transmit clock synthesizer fault.
I-Channl I channel activity fault.
Q-Channl Q channel activity fault.
AGC_level Automatic gain control level fault.
Module Modulator module fault. Typically indicates that the
modulator module is missing or will not program.
Dmd_Flts - Demodulator/Decoder Faults
C_Detect Carrier detect fault. Indicates that the decoder is not locked.
RF_Syn Demodulator RF synthesizer fault.
Data_Clk Receive data clock activity fault.
I-Channl I channel activity fault.
Q-Channl Q channel activity fault.
Dscrambl Descrambler activity fault.
BER Thrshld BER Threshold fault. Indicates that the corrected BER
Threshold that is set in the “Utility” menu has been
exceeded.
Module Demodulator/decoder module fault. Typically indicates that
the demod/decoder module is missing or will not program.
CEQ_Flts - Common Equipment Faults
Battery Battery fault.
-12 volt Negative 12 volt power supply fault.
+12 volt Plus 12 volt power supply fault.
+5 volt Plus 5 volt power supply fault.
Controlr Controller fault. Typically indicates that the controller has
gone through a power on-off cycle.
Intrface Interface module fault. Typically indicates that the interface
module is missing or will not program.