Indicates the number of the alarm. Alarms are numbered sequentially from 1 - n. A management station can keep track of the last event it uploaded and periodically GET-NEXT from there to determine if there have been any new events. This means that, as alarms are removed from the table their indices are not reused until the next reset to default configuration (which loses all stored alarms). The agent must store the 'next available alarm number' value across re-initializations of the system, resetting it to 1 only when the configuration is reset to defaults.