In SUs using SW version below 2.5: The Action that should be performed by Temporary SU upon the Network Entry. Action should be performed using the rbSwSuDefaultFile. In SUs using SW version 2.5 and higher: The action to be taken with the rbSwSuDefaultFile upon network entry by all SUs using Air Interface type a. Not applicable if either the rbAuSuUpgradeSwAction in the AU serving this SU, or rbSuUnitControl for this SU, are other than none (1).