Major Rx Alarms; Minor Tx Alarms; Minor Rx Alarms - Comtech EF Data DMD50 Installation And Operation Manual

DMD50 Univeral Satellite Modem
6.2.1.2

Major Rx Alarms

Alarm
FPGA CFG
DSP CFG
SIGNAL LOCK
FRAME LOCK
MULTIFRAME LOCK
LB SYNTH PLL
IF SYNTH PLL
Ethernet WAN
6.2.1.3

Minor Tx Alarms

Alarm
TERR CLK ACT
TERR DATA ACT
TX TERR AIS
DnI FRAME LOCK
DnI M-FRAME LOCK
TX DVB FRAME
LOCK
6.2.1.4

Minor Rx Alarms

Alarm
BUFF UNDERFLOW Indicates that a Doppler Buffer underflow has occurred.
BUFF NEAR
EMPTY
BUFF NEAR FULL
BUFF OVERFLOW
RX DATA
ACTIVITY
SAT AIS
MN-DMD50– Revision 3
Possible Cause
Indicates a receive FPGA hardware failure.
Indicates a receive DSP failure.
Indicates that the demod is unable to lock to a signal.
Indicates that the Framing Unit is unable to find the expected framing pattern.
Indicates that the Framing Unit is unable to find the expected framing pattern.
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.
Indicates that the Rx IF 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.
Indicates that the WAN Port is down.
Possible Cause
Indicates no Terrestrial Clock activity.
Indicates no Tx Data activity.
Indicates that AIS has been detected in the Tx Data Stream.
When running Drop Mode, indicates that the framing unit is unable to find the exported
terrestrial framing pattern.
When running Drop Mode, indicates that the framing unit is unable to find the exported
terrestrial framing pattern.
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.
Possible Cause
Indicates that the Doppler Buffer is about to underflow.
Indicates that the Doppler Buffer is about to overflow.
Indicates that a Doppler Buffer overflow has occurred.
Indicates that there is no Rx Data activity. For the Ethernet Interface, indicates
that no Ethernet port is active (no cable is plugged in).
Indicates that AIS has been detected in the receive satellite data stream.
Maintenance and Troubleshooting
6–3