This sets the threshold (0 to 600, likely representing a loss count or a scaled percentage given the unusually specific upper bound) that triggers a fault for near-end frame loss during a frame-loss measurement test, near-end meaning loss associated with ingress data frames at this local MEP as clarified by the related FrameLossNear field's own description. An admin sets this to gate a fault specifically on loss happening on the local receive side, distinct from the far-end threshold that covers the remote side's loss. For example, cienaCesCfmFrameLossMsgNearLossThreshold set low on a strict SLA circuit would raise a fault quickly if ingress frame loss at this local MEP starts creeping up, even while far-end loss stays well within its own separate limit.