When the alarm whose synchronization is initiated by the NMS, one of the following methods can be used: Options: 1. other(1) -other. 2. stop(2) -stop. 3. interval(3) -indicates that synchronize the alarm by serial number (that is, synchronize all the alarms in the system). During the synchronization, hwAlarmSynBeginSn, hwAlarmSynEndSn and hwSynTrapAdminStatus need to be issued. The corresponding value is interval(3). 4. all(4) -indicates that synchronize all the active alarms (the active alarms refer to the alarm whose fault alarms are already sent but the corresponding recovery alarms are not sent). hwSynTrapAdminStatus is issued directly and the corresponding value is all (4).