SDM-300L3 Satellite Modem
Revision 1
Front Panel Operation
MN/SDM300L3.IOM
4–70
FUNCTION SELECT: FAULTS/ALARMS: TX INTERFACE
TX INTERFACE
--------
TX DROP
Drop interface hardware fault. Typically indicates that the drop
interface PLL is not locked (D&I only). (Overhead Card only.)
TX DATA/AIS
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.
TX CLK PLL
Transmitter phase-locked loop fault. Indicates the transmitter
Phase-Locked Loop (PLL) is not locked.
TX CLK ACTIVITY
Activity detector alarm of the selected interface transmit clock.
The interface will fall back to the internal clock when this alarm is
active.
TX AUDIO 1 CLIP
IDR TX audio for channel 1 is clipped. (Overhead Card only.)
TX AUDIO 2 CLIP
IDR TX audio for channel 2 is clipped. (Overhead Card only.)
CONFIGURATION
TX interface configuration fault.
Indicates the TX interface cannot execute a programmed
configuration parameter.
