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SDM-309B Satellite Modem
3.1.6.1 Mod_Flts - Modulator Faults
RF_Syn
Data_Clk
TClk_Syn
I-Channl
Q-Channl
AGC_level
Module
3.1.6.2 Dmd_Flts - Demodulator/Decoder Faults
C_Detect
RF_Syn
Data_Clk
I-Channl
Q-Channl
BERthrsh
Module
3.1.6.3 CEQ_Flts - Common Equipment Faults
Battery
-12 volt
+12 volt
+5 volt
Intrface
3.1.6.4 TX_INTF - Transmit Interface Faults
Data/AIS
TX_PLL
CLK_ACT
3.1.6.5 RX_INTF - Receive Interface Faults
BUF_UNFL
BUF_OVFL
MN/U-SDM309B Rev. #
Modulator RF synthesizer fault.
Transmit data clock activity indicator.
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.
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.
Secondary alarm result of BERT_set in the DEMOD configuration menu.
Demodulator/decoder module fault. Typically indicates that the demod/decoder
module is missing or will not program.
Battery fault.
Negative 12 volt power supply fault.
Plus 12 volt power supply fault.
Plus 5 volt power supply fault.
Interface module fault. Typically indicates that the interface module is missing or
will not program.
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 1.2.3 (Interface
Configuration) for a detailed description of these faults.
Transmitter phase locked loop fault. Indicates that the transmitter PLL is not
locked.
Activity detector alarm of the selected interface transmit clock. The interface
will fall back to the internal clock when this fault is active.
Buffer underflow fault. Indicates that a plesiochronous buffer underflow has
occurred.
Buffer overflow fault. Indicates that a plesiochronous buffer overflow has
occurred.
Operation
3–11
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