Description: The name of the second ATM address filter set or ATM address filter expression used in the logical expression. The value of this object can only be either an existing atmAddressFilterSetName whose row is already active in the ciscoAtmAddressFilterSetTable or an existing atmAddressFilterExpressionName whose row is already active in the ciscoAtmAddressFilterExpressionTable. The value of this object shall be null if the value of corresponding atmAddressFilterExpressionOperator object is not(4) or none(5). When the reference that this object is pointing to gets deleted out from under it, this object may have a value that does not exist in both ciscoAtmAddressFilterExpressionTable and ciscoAtmAddressFilterSetTable and the expression will be evaluated as if the deleted filter resulted in a match with a permission of 'permit'. The value of this object can be modified for an existing row only after placing that row notInService by setting the respective atmAddressFilterExpressionRowStatus object to the value notInService.