. By navigating the database, the operator can sort data according to their requirements. Navigating through the events database can be done using tools such as view range, the naviga- tor buttons and sort. The operator can search for one or more related events in the event database. The search operation will be executed over the entire database; it is not restricted to the displayed event viewer alone. Detailed event properties are viewed in a dialog box such as in Figure 12.17. Each event property is described in Table 12.2. The operator can view the alarms related to a particular event. 12.11.2 Working with Alarms Alarms are generated when a failure or fault is detected in network device(s). The alarms generated are displayed in the Alarm Viewer. The Alarm Viewer provides a range of functions for extracting information from alarms. The alarm database can be navigated with the help of the view range, navi- gator buttons, column reordering and so on. The operator can also view the severity of alarms (these are colour-coded on-screen) in Figure 12.18. Alarms can also be searched using queries. Alarm details include a brief description of the device which has failed, the owner with whom the alarm is associated and the date, time and severity of the alarm. 12 Fault Management A AdventNet Event Event Details Seq. # Class Node Added to Database Message Category Topology Domain Network jayakumar Failure Object jayakumar Source jayakumar Help URL Date/Time Jun 21,2001 01:53:48 AM GroupName webNMS Close Figure 12.17 Event details. Table 12.2 Event properties. Property Description Sequence number Unique ID for the event generated Severity Criticality of the event Message Any additional information on the event Category Alarm category Domain This is a property in the event object which holds any domain-specific information based on physical location or functional categorization, or logical categorization of the source of the event Network Information about the network to which the source of the event belongs is specified 