Comtech EF Data SDM-300L3 - Manual (Page 138)

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.