Comtech EF Data DMDVR20 LBST Rev 1.1 - Manual (Page 78)

DMDVR20 LBST Satellite Modem Maintenance and Troubleshooting
TM136 – Rev. 1.1 6-3
6.1.1.2 Major Rx Alarms
Alarm Possible Cause
FPGA CFG
Indicates a receive FPGA hardware failure.
DSP CFG Indicates a receive DSP failure.
SIGNAL LOCK Indicates that the demod is unable to lock to a signal.
FRAME LOCK Indicates that the Framing Unit is unable to find the
expected framing pattern.
LB SYNTH PLL Indicates that the Rx L-Band Synthesizer is not locked. This
alarm will flash on during certain modem parameter
changes. A solid indication points toward a configuration
problem within the modem.
6.1.1.3 Minor Tx Alarms
Alarm Possible Cause
TERR CLK ACT Indicates no Terrestrial Clock activity.
TERR DATA ACT Indicates no Tx Data activity.
TX TERR AIS Indicates that AIS has been detected in the Tx Data Stream.
TX DSS FRAME LOCK Indicates that the Tx Input Data Stream Framing does not
match the user selected Tx Terr Framing. Incorrect Tx Terr
Framing selected. Incorrectly framed Tx Input Data Stream.
BUC CURRENT Indicates that current is either below or above the threshold
limits of the LNB, as specified by the modem. Only active
when voltage is enabled.
BUC VOLTAGE Indicates that the voltage is not functioning correctly when
voltage is enabled.