Comtech-ef-data SNM-1000 User Manual download pdf (Page 146)

SNM-1000 Node Control Modem Revision 3

Maintenance MN/SNM1000.IOM

5–16

Fault/Alarm Possible Problem and Action

BUFFER CLK PLL Buffer clock phase-locked loop fault. The buffer synthesizer is the

wrong frequency or will not lock.

Ensure the selected buffer clock source is at the proper frequency and

level. If the fault continues, contact the Comtech EF Data Customer

Support Department.

BUFFER CLK ACT Activity detector alarm of the selected interface receive clock.

The interface will fall back to the satellite clock when this fault is

active.

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.

RX INSERT Not Applicable

RX AUDIO 1 CLIP Not Applicable

RX AUDIO 2 CLIP Not Applicable

CONFIGURATION Configuration fault.

Indicates the selected, Fault Relay or Fault LED is not functioning.

Check the signal of the selected RX source to verify the signal is

present. The configuration will fall back to the default when this alarm

is active.

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Comtech-ef-data SNM-1000 User Manual Page 146