This object identifies the class of network resource to which a given alarm entry in the Alarm Table relates, stored as a name string up to 30 characters. It lets an admin filter or group active alarms by the type of managed object affected, such as a specific card or interface class, rather than reading each alarm's free-text description. For example, this field might hold a value like 'EthernetPort' to indicate the alarm concerns an Ethernet interface class.