This object reflects the type of ATM virtual interface that can be configured within a physical interface. The supported types of virtual interfaces and their description is shown below: uni : Only one virtual interface of uni type can be configured within a physical interface. The ATM cells used in this interface would use a 8 bit VPI and a 4 bit GFC. nni : Only one virtual interface of nni type can be configured within a physical interface.The ATM cells used in this interface would use a 12 bit VPI. vnni: Multiple virtual interfaces of vnni type can be configured within a physical interface. However, all cells sent on this interface belong to a single VPI (defined by caviVpiNum) and the cells use a 12 bit VPI. vuni: Multiple virtual interfaces of vuni type can be configured within a physical interface. However, all cells sent on this interface belong to a single VPI (defined by caviVpiNum) and the cells use a 8 bit VPI and a 4 bit GFC. evuni: Multiple virtual interfaces of evuni type can be configured within a physical interface. However, all cells sent on this interface belong to a range of VPI (defined by caviMinVpiNum & caviMaxVpiNum) and the cells use a 8 bit VPI and a 4 bit GFC. evnni: Multiple virtual interfaces of evuni type can be configured within a physical interface. However, all cells sent on this interface belong to a range of VPI (defined by caviMinVpiNum & caviMaxVpiNum) and the cells use a 12 bit VPI.