Span Phase Alarm; Span Jitter Alarm - Symmetricom TimeSource 2700 Manual

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Span Phase Alarm

Span phase transient event data is processed through a leaky-
bucket alarm manager, to control escalation to an event or alarm.
The nominal time to assert is 7 seconds, and the maximum time
to retire is 3 minutes.
Maintenance action required - Occasional span phase alarm
activity may occur as a result of network maintenance. Persistent
phase alarm activity is not normal. Check the BTMONitor Alarm
Log screen, and if there are multiple events per day, the span line
input should be considered suspect. This indicates that timing on
the incoming span line is not within specification. Troubleshoot
the source of the timing for the incoming span line, or contact the
span line service provider.

Span Jitter Alarm

Jitter is measured on the incoming span line with a resolution of
50 ns. If the peak-to-peak delta phase error exceeds the GR2830
1.6 ms threshold for a period of 100 ms, an input jitter alarm is
declared. This alarm is also activated if there is a loss of span line
input signal for a period greater than 100 ms.
Maintenance action required - The input span line cable may have
become disconnected; check and tighten all cable connections. If
the alarm persists, timing on the incoming span line is not within
specification. Troubleshoot the source of the timing for the
incoming span line, or contact the span line service provider. If the
alarm persists, replace the cable.
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