This notification is only valid when the RttMonRttType is 'echo' or 'pathEcho'. A rttMonConnectionChangeNotification indicates that a connection to a target (not to a hop along the path to a target) has either failed on establishment or been lost and when reestablished. Precisely, this has resulted in rttMonCtrlOperConnectionLostOccurred changing value. If History is not being collected, the instance values for the rttMonHistoryCollectionAddress object will not be valid. When RttMonRttType is not 'echo' or 'pathEcho' the rttMonHistoryCollectionAddress object will be null. rttMonConnectionChangeNotification object is superseded by rttMonNotification.