An indication of the validity of the ATM address at the user side of the UNI port. To configure a new address in this table, the user-side IME must set the appropriate instance of this object to the value valid(1). To delete an existing address in this table, the user-side IME must set the appropriate instance of this object to the value invalid(2). If circumstances occur on the network-side IME which cause an address to become invalid, the network-side IME modifies the value of the appropriate instance of this object to invalid(2). Whenever the value of this object for a particular address becomes invalid(2), the conceptual row for that address may be removed from the table at any time, either immediately or subsequently.