The object identifier of the first object in the
ATM VBR-AAL MIB which corresponds to this DXIADDR
of this DXI port. If there is only one ATM VBR-AAL
object associated with this DXI object, then the
LMI DXIADDR entry in this table will have a valid
value for this variable, even though the
LMI DXIADDR has no valid VPI/VCI value.'