This, also accessible-for-notify, classifies the specific type of fault that occurred (none, RDI defect, MAC status defect, remote-MEP CCM defect, CCM defect, or cross-connect CCM defect) and is delivered as part of a fault trap rather than polled directly. An admin uses this classification embedded in the trap to immediately know which category of problem occurred without needing to separately poll each of the individual defect flags (RDI, CCM error, cross-connect, etc.) elsewhere in the MIB to figure out which one actually fired. For example, a trap carrying cienaCesCfmServiceFaultType = xconCCMDefect(6) tells the admin immediately this is the more serious cross-connect condition, warranting urgent investigation, rather than a routine RDI or CCM timing issue.