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SDM-300L3 Satellite Modem
Front Panel Operation
FUNCTION SELECT: FAULTS/ALARMS: TX INTERFACE
TX DROP
TX DATA/AIS
TX CLK PLL
TX CLK ACTIVITY
TX AUDIO 1 CLIP
TX AUDIO 2 CLIP
CONFIGURATION
TX INTERFACE
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Drop interface hardware fault. Typically indicates that the drop
interface PLL is not locked (D&I only). (Overhead Card only.)
Data or AIS. When data fault is selected in the Interface
Configuration menu, the fault indicates a data stable condition.
This indicates the data is all 1s or 0s (i.e., data is not
transitioning). When AIS is selected, the alarm indicates the data
is all 1s from customer data input to the modem. When None is
selected in the Interface Configuration menu, the TX Data/AIS
Fault/Alarm is not activated. (Overhead Card only.)
Note: AIS is an alarm, not a switching fault.
Transmitter phase-locked loop fault. Indicates the transmitter
Phase-Locked Loop (PLL) is not locked.
Activity detector alarm of the selected interface transmit clock.
The interface will fall back to the internal clock when this alarm is
active.
IDR TX audio for channel 1 is clipped. (Overhead Card only.)
IDR TX audio for channel 2 is clipped. (Overhead Card only.)
TX interface configuration fault.
Indicates the TX interface cannot execute a programmed
configuration parameter.
4–70
Revision 1
MN/SDM300L3.IOM
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