Comtech EF Data SNM-1010L - Manual (Page 197)

SNM-1010L Data/Control Modem Revision 0
System Checkout MN/SNM1010L.OM
Fault/Alarm Possible Problem and Action
DEMUX_LOCK Demultiplexer synchronization lock fault. This fault means that the
demultiplexer is unable to maintain valid frame and multiframe
alignment.
The usual cause is invalid or absent receive data. This is a major
(prompt) alarm. The alarm will cause insertion of receive AIS (all 1s)
and the switch-over will be attempted. This fault is to be sent as a
backward alarm to the distant end. This fault will occur when no carrier
is present, but will probably never occur with a correct signal.
RX 2047 LOCK RX 2047 lock alarm.
Indicates the RX 2047 data test pattern is not being received by the
decoder. The alarm probably indicates the transmitter is not set
correctly.
BUFFER FULL Buffer full alarm.
Indicates the buffer is < 10% or > 90% full.
CONFIGURATION Modulator/Demodulator Configuration fault.
Indicates a fault in either the Modulator or Demodulator state.
7.2.2.5 Common Equipment Faults
Fault/Alarm Possible Problem and Action
BATTERY/CLOCK M&C battery voltage or clock fault.
Indicates a low voltage in the memory battery. Typically, this fault will
be active when a modem has been hard reset or the firmware has been
changed. When a hard reset has been executed or the firmware has been
changed, this fault will typically be active when the modem is first
turned on.
-12 VOLT SUPPLY -12V power supply fault.
Indicates a high or low voltage condition. Level is
± 5%.
Check for a short on the -12V line from the power supply or on any of
the plug-in boards.
+12 VOLT SUPPLY +12 VDC power supply fault. Use the same procedure as with -12V
fault.
+5 VOLT SUPPLY +5V power supply fault. Use the same procedure as with a -12V fault.
The +5V supply requires a minimum load of 1A.
CONTROLLER Controller fault.
Indicates a loss of power in the M&C card. Typically indicates the
controller has gone through a power on/off cycle.
INTFC MODULE Interface Module fault.
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