The event occurrence period applies to access control units and intrusion detection units that were temporarily offline. If a unit is offline in Security Center, but still physically running, when the unit is re-connected the events that were stored on the unit while it was offline are received in Security Desk. The occurrence period value indicates how long ago the event occurred before the unit came back online, and determines what happens when the event is received.
Only certain types of units (for example, HID VertX, Bosch) keep a record of events that occur while it is offline. For units that support offline events, you can configure different grace periods in the unit extension in Config Tool to control how offline events are treated in Security Center.
The four event occurrence values are listed below, with a description of what happens when Security Center receives the event:
- The event occurred when the unit was online.
- Grace period
- The event occurred during the Grace period configured in the unit extension. Security Center treats the event as a live event. It appears in the event list in the Monitoring task. Actions that are associated with the event using event-to-actions are triggered.
- Offline alarm
- The event occurred between the Grace period and the
Alarm grace period configured in the unit extension.
The event does not appear in the event list in the
Monitoring task, unless it is one of the following:
- Input alarm activated
- Intrusion detection area alarm activated
- Intrusion detection area duress
- Intrusion detection unit tamper
The event is recorded in the database and is available for reporting.
- The event occurred between the Alarm grace period and the Persistence grace period configured in the unit extension. When the event is received in Security Center, it is only recorded in the database for reporting.
Reasons why units can be offline
- The unit is rebooting.
- The unit’s firmware is being upgraded.
- The connection between the unit and the Access Manager or Intrusion Manager is lost.
- The connection between the Access Manager or the Intrusion Manager and the Directory is lost. When this happens, the role disconnects from its units until the connection with the Directory is re-established.