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SDM-300A Satellite Modem
3.3.10.4
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
Rev. 4
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 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
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.
Operation
-3
.
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