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SLM-3650 Satellite Modem
Maintenance
5.2.3.3
Transmit Interface Faults
Fault/Alarm
TX DROP
TX DATA/AIS
TX CLOCK PLL
TX CLOCK ACT
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Possible Problem and Action
Drop interface hardware fault (D&I only).
The typical cause of this fault is the drop phase-locked loop is not locked, or
some other drop interface hardware has malfunctioned. Contact the
Comtech EF Data Customer Support Department.
Data or incoming AIS.
When the AIS is selected in the Interface Utility menu for TX data fault, the
transmit interface fault TX data/AIS is monitoring a fault condition of all 1s
from customer data input to the modem. When data is selected in the
Interface Utility menu for TX data fault, the TX interface fault TX data/AIS is
monitoring a fault condition of all 1s or 0s. This is referred to as a data-stable
condition (data is not transitioning). This fault indicates there is trouble in the
chain sending data to the modem. The modem passes this signal
transparently, and takes no other action. This indication is a monitor function
only, and aids in isolating the trouble source in a system.
Transmitter phase-locked loop fault.
Indicates the transmitter PLL is not locked to the reference of the interface
transmit clock recovery oscillator. Contact the Comtech EF Data Customer
Support Department.
Activity detector alarm of the selected interface transmit clock.
Indicates the selected TX clock is not being detected. Check the signal of
the selected TX clock source to verify the signal is present. The interface will
fall back to the internal clock when this alarm is active.
5–15
Revision 3
MN/SLM3650.IOM
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