Columns conceptually added to the interface table entry for an ATM interface to model the ATM cell layer. The row of the interface table modeling this object should also include columns for the physical path TP and TC Adapter object, as well as the ATM interface table defined in RFC 1695.

The default configuration of an entry in this table is used whenever the entries for the physical path TP, etc., are created. The management system configures a UNI, B-ICI, or B-ISSI on the interface by first modifying the atmfM4IfType column (this can be done in the same SNMP set-request that sets up the other necessary variables.