Comtech EF Data SLM-5650A - Manual (Page 332)

SLM-5650A Satellite Modem Revision 8
Appendix A MN-SLM5650A
A–10
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.
Table A-2. SLM-5650A Fault Tree
FAULT TYPE
TX IF
OUTPUT
OFF
TX
STATUS
LED
TX FAULT
RELAY (1)
RX
STATUS
LED
RX FAULT
RELAY (2)
UNIT
STATUS
LED
UNIT FAULT
RELAY (3)
AUDIBLE
ALARM
TX
AIS
RX
AIS
MODULATOR
FAULTS
NONE GREEN
MOD SYMBOL
CLOCK PLL
X RED X X X
MOD
SYNTHESIZER
PLL
X RED X X X
MOD I/Q
ACTIVITY
X RED X X X
MOD FILTER
CLIPPING
X RED X X X
TX INTERFACE
CLOCK PLL
RED X X X
TX INTF CLOCK
ACTIVITY
ORANGE X X
TX INTERFACE
SCT PLL
RED X X X
TX INTERFACE
DATA AIS
ORANGE X
DEMODULATOR
FAULTS
NONE GREEN
DEMOD CARRIER
LOCK
RED X X X
DEMOD
DECODER LOCK
RED X X X
DEMOD
SYNTHESIZER
PLL
RED X X X
DEMOD I/Q
ACTIVITY
RED X X X
DEMUX LOCK RED X X X
BUFFER RED X X X
BUFFER FILL ORANGE X
BUFFER
OVERFLOW
ORANGE X
BUFFER
UNDERFLOW
ORANGE X
BUFFER PLL RED X X X
BUFFER CLK REF
ACTIVITY
ORANGE X
RX INTERFACE
DATA AIS
ORANGE X
Eb/No
THRESHOLD
ORANGE X
BERT SYNC
LOSS
ORANGE X