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SLM-7650 Satellite Modem
Operation
3.4.3.3
Transmit Interface Faults
Menu Item
MODULE
TX DATA/AIS
TX CLK ACTIVITY
TX CLK PLL
SCT PLL
SCT REFERENCE ACT
TX DROP
3.4.3.4
Receive Interface Faults
Menu Item
MODULE
BUFFER CLK PLL
BUFFER CLK ACT
RX DATA/AIS
DEMUX LOCK
RX 2047 LOCK
BUFFER OVERFLOW
BUFFER UNDERFLOW
BUFFER FULL
BACKWARD ALARM
RX INSERT
FRAME BER
TX Interface section fault. Typically indicates that the TX Interface section will not
program.
Data or AIS. When DATA fault is selected in the Configuration Interface 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, the TX
Data/AIS Fault/Alarm is not activated.
Note: AIS is an alarm, not a switching fault.
Activity detector alarm of the selected interface transmit clock. The interface will fall
back to the internal clock (SCT) when this alarm is active.
Indicates TX input clock is out of range.
SCT phase-locked loop (PLL) fault. Indicates the internal transmit clock oscillator
PLL is not locked to the selected reference.
Activity detector alarm at the input of the selected source for SCT Reference.
Indicates the selected clock is not being detected.
Drop interface fault. Typically indicates that terrestrial data stream is not
synchronized (D&I only)
RX Interface section fault. Typically indicates that the RX Interface section will not
program.
Buffer clock phase-locked loop fault. Indicates the buffer clock PLL is not locked.
Activity detector alarm of the selected interface receive clock. The interface will
fall back to the satellite clock when this fault is active.
Data or AIS. When DATA fault is selected in the Configuration Interface menu, the
fault indicates a data stable condition. This indicates the data coming from the
satellite is all 1s or 0s (i.e., data is not transitioning). When AIS is selected, the
alarm indicates the data is all 1s from the satellite. When NONE is selected the
RX Data/AIS Fault/Alarm is not activated.
Note: AIS is an alarm, not a switching fault.
DEMUX lock fault. Indicates that the Demux is not locked.
RX 2047 lock alarm. Indicates the RX 2047 data pattern is not locked.
Note: This alarm is only active when receive 2047 is on.
Buffer overflow alarm. Indicates that a buffer overflow has occurred.
Buffer underflow alarm. Indicates that a buffer underflow has occurred.
Buffer full alarm. Indicates the buffer is less than 10%, or greater than 90% full.
Indicate reception of IBS backward alarms.
D&I Insert fault. Typically indicates that terrestrial data stream is not synchronized
(D&I only)
Fault if Frame BER exceeds 1E-3 (option card PL/10175-2 only).
3-23
Specifications/usage
Specifications
Revision 4
MN/SLM7650.IOM
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