Symmetricom TimeSource 2500 Manual page 159

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Much of the transient event and event level information reported
via the BTMONitor Alarm Monitor screen is normal activity, which
does not impact the performance of the timing outputs, and is
useful primarily as a system operation monitoring tool. For
example, the TimeSource 2500 is designed to output PRS quality
signals without any view of GPS satellites for as long as 14 hours
on average per day. Therefore, it is common for the system to
report events regarding GPS satellite tracking and drop-out
activity, even though the activity will have no impact on the
performance of the outputs.
In general, minor and major alarms should appear infrequently,
and troubleshooting activity is not required, unless the system is
in alarm. Otherwise, it is likely the condition is transient, will clear
on its own, and will have had no impact on the quality of the
timing outputs.
The TimeSource 2500 reports transient events, events, and alarms
for the critical subsystems and inputs listed below:
Table P lists the BTMONitor Alarm Monitor screen messages,
descriptions of the messages, and the pages where the
descriptions can be found.
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• GPS
• Span Inputs
• Remote Oscillator Inputs
• Phase Locked Loop
• Local Oscillator Temperature
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Troubleshooting
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