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SDM-300L3 Satellite Modem
Front Panel Operation
FUNCTION SELECT: FAULTS/ALARMS: RX INTERFACE
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
RX INTERFACE
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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 Configuration Interface menu 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.
(Overhead Card only.)
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. (Overhead Card only.)
RX 2047 lock alarm. Indicates the RX 2047 data pattern is not locked.
(Overhead Card only.)
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 are selected for modem type.
IDR RX audio for channel 1 is clipped. (Overhead Card only.)
IDR RX audio for channel 2 is clipped. (Overhead Card only.)
Configuration alarm
4–71
Revision 1
MN/SDM300L3.IOM
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