Symmetricom TimeSource 2700 Manual page 116

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The TimeSource 2700 provides a rich content of information about
system events and alarms, which is logged and reported to the
user, via front panel lamps, alarm relays, the BTMONitor Alarm
Monitor and Alarm Log Display screens, and TL1 messages. The
Alarm Monitor screen displays all active events and alarms, for
monitoring the functionality and operation of the system. The
Alarm Log screen displays the past 512 events, and alarm history.
The TimeSource 2700 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 2700 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 CDMA 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.
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 2700 is designed to output PRS quality
signals, without any CDMA signals, for as much as 14 hours on
average per day. Therefore, it is common for the system to report
CDMA signal drop-out activity, even though the activity will have
no impact on the performance of the outputs.
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