EndRun Sonoma D12 - Appendix G - System Faults; Overview

S o n o m a U s e r M a n u a l
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"Smarter Timing Solutions"
Appendix G
System Faults
The status of the Sonoma is constantly monitored and a fault will occur when any of several param-
eters is out of spec. When this happens the Alarm LED on the front panel will light. This appendix
denes the various faults.
Overview
The Alarm LED will light when a fault has occurred. You can see which fault is the problem by us-
ing the faultstat command.
Masking Faults
One fault can be masked. This is the SIG (CDMA Signal) fault. When masked, this fault will not
cause an alarm. You may want to mask the SIG fault if you are operating your Sonoma as a Stratum
2 server and are not using a CDMA signal. For information on Stratum 2 see Chapter 2 - NTP, Con-
figuring the Sonoma as a Stratum 2 Server.
To mask the fault use the setsigfltmask command. For more information see Chapter 9 - Con-
sole Port Control and Status or type help setsigfltmask at the console port.
If your Sonoma has the Dual Power Supply option then you may mask primary and/or secondary
power supply faults. See Chapter 10 - Options, Masking Dual Power Supply Fault Alarms for more
information.
System Fault Definitions
System Oscillator DAC (DAC)
This fault indicates that the DAC for the oscillator has reached either the high or low alarm limit
while locked to the CDMA signal. Unless the unit is being subjected to out-of-specication environ-
mental conditions, this would indicate that the oscillator frequency has drifted near to the end of life
region. This should normally only occur after at least ten years of operation. The unit will continue
to function until the oscillator frequency nally reaches the DAC endpoint. The unit should be re-
turned to the factory for oscillator replacement at your convenience.
CDMA Signal (SIG)
This fault indicates that the CDMA Subsystem has not been able to acquire a CDMA signal for one
hour while the Time Figure of Merit has been 9, the unsynchronized condition. This could be due
to a variety of reasons. If there are no other faults that could explain the inability to receive a signal,
then there could be an antenna failure or blockage. If the condition persists indenitely, and a prob-
lem with the antenna is not evident, then please contact EndRun Customer Support.