Comtech EF Data DMDVR20 LBST Rev 1.1 - Manual (Page 79)

Maintenance and Troubleshooting DMDVR20 LBST Satellite Modem
6-4 TM136 – Rev. 1.1
6.1.1.4 Minor Rx Alarms
Alarm Possible Cause
BUFF UNDERFLOW Indicates that a Doppler Buffer underflow has occurred.
BUFF NEAR EMPTY Indicates that the Doppler Buffer is about to underflow.
BUFF NEAR FULL Indicates that the Doppler Buffer is about to overflow.
BUFF OVERFLOW Indicates that a Doppler Buffer overflow has occurred.
RX DATA ACTIVITY Indicates that there is no Rx Data activity. For the Ethernet
Interface, indicates that no Ethernet port is active (no cable
is plugged in).
SAT AIS Indicates that AIS has been detected in the receive satellite
data stream.
IFEC LOCK Indicates that the Inner Codec is not locked.
OFEC LOCK Indicates that the Reed-Solomon Decoder is not locked.
EBNO (dB) Indicates that the Eb/No is outside of limits.
6.1.1.5 Common Major Alarms
Alarm Possible Cause
TERR FPGA CFG Indicates an Interface Card FPGA configuration failure probably
caused by a missing, or wrong file.
CODEC FPGA CFG Indicates Turbo Codec Card FPGA configuration failure probably
caused by a missing, or wrong file.
+1.5V RX SUPPLY Displays the measured voltage of the 1.5 Volt Rx power bus located
inside the modem.
+1.5V TX SUPPLY Displays the measured voltage of the 1.5 Volt Tx power bus located
inside the modem.
+3.3V SUPPLY Displays the measured voltage of the +3.3 Volt power bus located
inside the modem.
+5V SUPPLY Displays the measured voltage of the +5 Volt power bus located
inside the modem.
+12V SUPPLY
Displays the measured voltage of the +12 Volt power bus located
inside the modem.
+20V SUPPLY
Displays the measured voltage of the +20 Volt power bus located
inside the modem.
EXT CLOCK ACT Indicates that the External Clock is not active.
EXT REF ACT
Indicates no activity on the External Reference.
EXT REF LOCK
Indicates that the External Reference PLL is not locked.