A.4 System Faults/Alarms; Table A-2. Slm-5650A Fault Tree - Comtech EF Data SLM-5650A Installation And Operation Manual

SLM-5650A Satellite Modem
Appendix A
A.4 System Faults/Alarms
System faults are reported in MONITOR: Alarms from the front panel menu, and stored faults
are reported in the MONITOR: Event-Log menu. To determine the appropriate action for
repairing the modem, refer to Table A-2 and the list of possible problems.
FAULT TYPE
MODULATOR
NONE
FAULTS
MOD SYMBOL
CLOCK PLL
MOD
SYNTHESIZER
PLL
MOD I/Q
ACTIVITY
MOD FILTER
CLIPPING
TX INTERFACE
CLOCK PLL
TX INTF CLOCK
ACTIVITY
TX INTERFACE
SCT PLL
TX INTERFACE
DATA AIS
DEMODULATOR
NONE
FAULTS
DEMOD CARRIER
LOCK
DEMOD
DECODER LOCK
DEMOD
SYNTHESIZER
PLL
DEMOD I/Q
ACTIVITY
DEMUX LOCK
BUFFER
BUFFER FILL
BUFFER
OVERFLOW
BUFFER
UNDERFLOW
BUFFER PLL
BUFFER CLK REF
ACTIVITY
RX INTERFACE
DATA AIS
Eb/No
THRESHOLD
BERT SYNC
LOSS

Table A-2. SLM-5650A Fault Tree

TX IF
TX
TX FAULT
OUTPUT STATUS
RELAY (1)
OFF LED
GREEN
X RED X
X RED X
X RED X
RED
X X
RED
X
ORANGE
X
RED
X
ORANGE X
A–10
UNIT
RX
RX FAULT
STATUS STATUS
RELAY (2)
LED LED
GREEN
RED
X
RED X
RED X
RED X
RED
X
RED X
ORANGE
X
ORANGE
X
ORANGE
X
RED
X
ORANGE
X
ORANGE
X
ORANGE X
ORANGE X
Revision 8
MN-SLM5650A
UNIT FAULT AUDIBLE TX
RELAY (3) ALARM AIS
X X
X X
X X
X X
X X
X
X X
X
X
X
X
X
X
X
RX
AIS
X
X
X
X
X
X
X