Specifications

SDM-309B Satellite Modem Operation
MN/U-SDM309B Rev. # 3–11
3.1.6.1 Mod_Flts - Modulator Faults
RF_Syn Modulator RF synthesizer fault.
Data_Clk Transmit data clock activity indicator.
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.
3.1.6.2 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.
BERthrsh Secondary alarm result of BERT_set in the DEMOD configuration menu.
Module Demodulator/decoder module fault. Typically indicates that the demod/decoder
module is missing or will not program.
3.1.6.3 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.
Intrface Interface module fault. Typically indicates that the interface module is missing or
will not program.
3.1.6.4 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 1.2.3 (Interface
Configuration) for a detailed description of these faults.
TX_PLL Transmitter phase locked loop fault. Indicates that the transmitter PLL is not
locked.
CLK_ACT Activity detector alarm of the selected interface transmit clock. The interface
will fall back to the internal clock when this fault is active.
3.1.6.5 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.