Comtech EF Data DMD1050 - Manual (Page 74)

DMD1050 Satellite Modem Board Maintenance and Troubleshooting
MN-DMD1050 5–2
Revision 9
5.2.1 Alarm Faults
5.2.1.1 Major Tx Alarms
Alarm Possible Cause
FPGA CFG Shows a transmit FPGA hardware failure.
DSP CFG Shows a transmit FPGA failure.
SCT Clock PLL Shows that the Tx SCT Clock PLL is not locked. This alarm flashes during certain
parameter changes. A steady display shows a problem in the modem configuration.
SYM Clock PLL Shows that the Tx Symbol Clock PLL is not locked. This alarm flashes during certain
parameter changes. A steady display shows a problem with the incoming clock to the
modem (SCTE).
LB Synth PLL Shows that the Tx L-Band Synthesizer is not locked. This alarm flashes during certain
parameter changes. A steady display shows a configuration problem in the modem.
Ethernet WAN Shows that the WAN Port is down.
5.2.1.2 Major Rx Alarms
Alarm Possible Cause
FPGA CFG Shows a receive FPGA hardware failure.
DSP CFG Shows a receive DSP failure.
SIGNAL LOCK Shows that the demod is unable to lock to a signal.
FRAME LOCK Shows that the Framing Unit is unable to find the expected framing pattern.
MULTIFRAME LOCK Shows that the Framing Unit is unable to find the expected framing pattern.
LB SYNTH PLL Shows that the Rx L-Band Synthesizer is not locked. This alarm flashes during certain
parameter changes. A steady display shows a problem in the modem configuration.
Ethernet WAN Shows that the WAN Port is down.
5.2.1.3 Minor Tx Alarms
Alarm Possible Cause
TERR CLK ACT Shows no Terrestrial Clock activity.
TERR DATA ACT Shows no Tx Data activity.
TX TERR AIS Shows that AIS has been detected in the Tx Data Stream.
TX DVB FRAME LOCK Shows that the Tx Input Data Stream Framing does not match the selected Tx Terr
Framing. Incorrect Tx Terr Framing is selected. Incorrectly framed Tx Input Data
Stream exists.