The current operational state of the interface. The testing(3) state indicates that no operational packets can be passed. If IfAdminStatus is down(2) then IfOperStatus should be down(2). If IfAdminStatus is changed to up(1) then ifOperStatus should change to up(1) if the interface is ready to transmit and receive network traffic; it should change to dormant(5) if the interface is waiting for external actions (such as a serial line waiting for an incomming connection); it should remain in the down(2) state if and only if there is a fault that prevents if from going to the up(1) state.