lpImaLkFarEndUnusableSec 1.3.6.1.4.1.562.2.4.1.12.22.3.12.1.6

This attribute counts the number of one second intervals during which the 'Tx/Rx Unusable' condition has been received from the far end. This attribute will always have a value of 0 if the protocol for the IMA group is proprietary.