cirbhUmtsConnectionRootIfIndex 1.3.6.1.4.1.9.9.483.1.2.1.2.2.1.3

The root interface used to transport and receive UMTS traffic as follows. ATM: ATM0/0.0-aal5 layer -> ATM0/0-atm layer. IMA ATM0/IMA0.1-aal5 layer -> ATM0/IMA0