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OM20 Universal Outdoor Modem
Symptom
The Modem will not acquire the
incoming carrier:
The Async Port is not
configured correctly.
7.2.1 Alarm Faults
7.2.1.1
Major Tx Alarms
Alarm
FPGA CFG
DSP CFG
SCT Clock PLL
SYM Clock PLL
LB Synth PLL
IF Synth PLL
Ethernet WAN
MN-OM20– Revision 5
Possible Cause
There is an improper receive input to modem.
The Receive Carrier Level is too low.
The Receive Carrier Frequency is outside of the acquisition
range.
The Transmit Carrier is incompatible.
Modem is in Test Mode.
The switches may not be set in the correct positions.
Possible Cause
Indicates a transmit FPGA hardware failure.
Indicates a transmit FPGA failure.
Indicates that the Tx SCT Clock PLL 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 Tx Symbol Clock PLL is not locked. This alarm will
flash on during certain modem parameter changes. A solid indication
points toward a problem with the incoming clock to the modem (SCTE).
Indicates that the Tx 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 Tx 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.
Maintenance and Troubleshooting
7–2
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