Event occurrence period

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:

Reasons why units can be offline

An access control or intrusion detection unit can be offline in Security Center for the following reasons:
  • 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.