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SLM-3650 Satellite Modem
Operation
3.4.10.4
Function Select: Receive Interface: Faults
BUFFER UNDERFLOW
BUFFER OVERFLOW
RX DATA/AIS
FRAME BER
BACKWARD ALARM
BUFFER CLK PLL
BUFFER CLK ACT
DEMUX LOCK
RX 2047 LOCK
BUFFER FULL
RX INSERT
RX AUDIO 1 CLIP
RX AUDIO 2 CLIP
CONFIGURATION
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Buffer underflow alarm. Indicates that a buffer underflow has occurred.
Buffer overflow alarm. Indicates that a buffer overflow has occurred.
Data or AIS. When data fault is selected in the Function Select:
Configuration Interface menu (Figure 3-6), the fault indicates a data stable
condition. This indicates the data coming from the satellite is all 1s or 0s (i.e.,
data is not transitioning). When AIS is selected, the Alarm indicates the data is
all 1s from the satellite. When None is selected in the Configuration Interface
menu, the RX Data/AIS Fault/Alarm is not activated.
Note: AIS is an alarm, not a switching fault.
Frame BER fault. Indicates that the frame BER exceeds 1 -3 .
Backward alarms.
Buffer clock phase-locked loop fault. Indicates the buffer clock PLL is not
locked.
Activity detector alarm of the selected interface receive clock. The interface
will fall back to the satellite clock when this fault is active.
DEMUX lock fault. Indicates that the DEMUX is not locked.
RX 2047 lock alarm. Indicates the RX 2047 data pattern is not locked.
Note: This alarm is only active if RX 2047 is ON.
Buffer full alarm. Indicates the buffer is less than 10% or greater than 90% full.
Insert interface hardware fault. Typically indicates the insert interface PLL is
not locked. This fault is only available when D&I is selected for modem type.
IDR RX audio for channel 1 is clipped.
IDR RX audio for channel 2 is clipped.
Configuration alarm
3–45
Revision 3
MN/SLM3650.IOM
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