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.