Specifications

Operation SDM-309B Satellite Modem
3–36 MN/U-SDM309B Rev. #
3.2.4.2 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.
BER Threshold Indicates the set BER threshold has been exceeded.
Module Demodulator/decoder module fault. Typically indicates that the
demod/decoder module is missing or will not program.
3.2.4.3 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.
3.2.4.4 TX_INTF - Transmit Interface Faults
Data/AIS Data or Alarm indication Signal. When Data_FLT is selected in the Interface
Configuration menu the fault indicates a Data stable condition. When AIS is
selected, fault indicates data is all 1’s. Refer to Section 3.2.2.3 (Interface
Configuration) for a detailed description of these faults.
DROP Drop Interface Hardware Fault. Typically indicates that the drop interface PLL
is not locked.
CLK_ACT Clock Activity fault. Indicates there is no clock activity on the TX interface.
3.2.4.5 RX_INTF - Receive Interface Faults
BUF_UNFL Buffer underflow fault. Indicates that a plesiochronous buffer underflow has
occurred.
BUF_OVFL Buffer overflow fault. Indicates that a plesiochronous buffer overflow has
occurred.
Data/AIS Data or Alarm Indication Signal. When Data_FLT is selected in the Interface
Configuration menu the fault indicates a Data stable condition. When AIS is
selected, the fault indicates data is all 1’s. Refer to Section 3.2.2.3 (Interface
Configuration for a detailed description of these faults.
FRM_BER Frame BER fault. Indicates that the frame BER exceeds 1E-3.
BW_ALM Backward Alarm Fault.
INSERT Insert Interface Hardware Fault. Typically indicates the insert interface PLL is
not locked.
INS_clk Insert Clock fault. Indicates no insert clock activity.
MUX_lock MUX lock fault. Indicates that the MUX is not locked.
3.2.5 Stored Faults