aluExtPortEtherLoopbackTimer is used to specify the time duration, in seconds, to set the ethernet port into a loopback mode. Setting aluExtPortEtherLoopbackTimer to a non-zero value must be accompanied by setting aluExtPortEtherLoopback to either 'line' or 'internal' for the same port. When this timer expires, it will be reset to the default value 0 by the system. Set aluExtPortEtherLoopbackTimer to 0 to keep the loopback mode until modified by the operator. While setting aluExtPortEtherLoopback to 'line' on a network port, aluExtPortEtherLoopbackTimer CAN NOT be set to 0. While setting aluExtPortEtherLoopback on an access port, aluExtPortEtherLoopbackTimer CAN be set to 0. While setting aluExtPortEtherLoopback to 'none', aluExtPortEtherLoopbackTimer MUST be set to 0. While setting aluExtPortEtherLoopbackPersist to 'true', aluExtPortEtherLoopbackTimer CAN NOT be set to a non-zero value.