This object carries the serial number stamped on a specific SNMP trap sent by the Ruckus ZoneDirector controller, uniquely identifying that individual notification instance. Because ZoneDirector fires many event traps in quick succession for things like AP joins, losses, and rogue detections, this serial lets a management station de-duplicate or order received traps even if delivery is out of sequence. For example, two ruckusZDEventAPLostTrap notifications arriving moments apart for different APs would carry differing serials such as 10482 and 10483 so an operator can tell them apart in the event log.