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SLM-7650 Satellite Modem
Maintenance
5.2.5.3
Transmit Interface Faults
Fault/Alarm
MODULE
TX DATA/AIS
TX CLOCK ACT
TX CLOCK PLL
SCT PLL
SCT REFERENCE
ACTIVITY
TX DROP
Table 5-4. Transmit Interface Fault Information
TX Interface section fault.
Typically indicates that the TX Interface will not program.
Return the modem for repair.
Data or incoming AIS.
UTILITY / INTERFACE / TX DATA FAULT = AIS
Will indicate a fault condition if the user data is all 1s.
UTILITY / INTERFACE / TX DATA FAULT = DATA
Will indicate a fault condition if the user data is all 1s or all 0s. This is referred to as a
data-stable condition (data is not transitioning).
Activity detector alarm of the selected transmit clock.
Indicates the selected TX clock is not being detected.
Check the signal of the selected TX clock source.
Indicates TX input clock is out of range.
Internal ST Clock loop fault.
Indicates the internal ST clock is not locked to the selected reference.
Return the modem for repair.
Activity detector alarm at the input of the selected source for SCT Reference.
Indicates the selected clock is not being detected.
Check the signal of the selected clock.
Indicates that the Drop mux has a fault. D&I only.
Possible Problem and Action
5–11
Revision 4
MN/SLM7650.IOM
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