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OM20 Universal Outdoor Modem
7.1.1.4 Minor Rx Alarms
Alarm
BUFF UNDERFLOW
BUFF NEAR EMPTY
BUFF NEAR FULL
BUFF OVERFLOW
RX DATA ACTIVITY
SAT AIS
DnI FRAME LOCK
DnI M-FRAME LOCK
INSERT CRC
T1/E1 SIGNALING
IFEC LOCK
OFEC LOCK
INTERLEAVER
EBNO (dB)
IBS BER
RX DVB FRAME LOCK
LNB CURRENT
LNB VOLTAGE
TM116 – Rev. 1.2
Possible Cause
Indicates that a Doppler Buffer underflow has occurred.
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.
Indicates if drop/insert data is frame locked.
Indicates if drop/insert data has multiframe lock.
Indicates if the Circular Redundancy Check is passing in
PCM-30C and PCM-31C Modes.
Indicates that the T1/E1 Signal is not locked.
Indicates that the Inner Codec is not locked.
Indicates that the Reed-Solomon Decoder is not locked.
Indicates that the Reed Solomon Interleaver is not
synchronized.
Indicates that the Eb/No is outside of limits.
Indicates that there are more than one in 1000 bits in error
in IBS mode.
Indicates that the Rx Satellite Data Stream FRMing is not
DVB.
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.
Indicates that voltage is not functioning correctly when
voltage is enabled.
Maintenance and Troubleshooting
7-4
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