Phase Lock Loop (Pll) Event And Alarm Summary; Pll Step Event - Symmetricom TimeSource 2700 Manual

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Phase Lock Loop (PLL) Event and Alarm Summary

The PLL events and alarms report activity associated with the
60 MHz synthesizer PLL subsystem. In general, PLL alarms
indicate a potential critical hardware fault in the system. Any
alarm is immediately treated as a minor alarm. If a PLL alarm
occurs with simultaneous alarm activity on all provisioned inputs,
a major alarm is reported.
The following transient event, event, and alarm messages will
appear in the window labeled Self Test on the Alarm Monitor
screen.

PLL Step Event

The step event category is used to capture abnormal phase or
frequency transient "pops" in the synthesizer PLL. A step event is
the magnitude of the delta between successive 250 ms samples
exceeding the threshold. The threshold is 0.5 percent of the total
VCXO pull-in range (70 ppm minimal).
Maintenance action required - None.
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Troubleshooting
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