Symmetricom TimeSource 2500 Manual page 158

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The TimeSource 2500 provides an extensive source of information
about system events and alarms, which is logged and reported to
the user via front panel lamps, alarm relays, TL1 messages, and
the BTMONitor Alarm Monitor and Alarm Log Display screens. The
Alarm Monitor screen displays all active events and alarms, for
monitoring the functionality and operation of the system. The
Alarm Log Display screen displays the past 512 events, and alarm
history.
The TimeSource 2500 reports two types of events: transient events
and events. A transient event is an intermittent or short-term non-
service-affecting condition outside the normal operating conditions
in an input or critical internal subsystem. An event is a standing
or persistent non-service-affecting condition outside the normal
operating conditions in an input or critical internal subsystem.
Each TimeSource 2500 input and critical internal subsystem may
produce reportable transient events, events, and alarms. All
transient events are processed through leaky buckets to correctly
clear the transient event, or to escalate it to an event or alarm.
Alarms are escalated through a user-adjustable threshold. For
span and remote oscillator inputs, the default threshold for a
standing minor alarm to escalate to a major alarm is 48 hours.
For GPS inputs, the default threshold for the amount of time from
the beginning of bridging mode to the initiation of a major alarm is
48 hours. Service-impacting alarm conditions are reported directly
as a major alarm.
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TimeSource 2500