This read-write CmPmBinAction lets a management station issue a clear command against this OC-n/STM-n history bin. It gives an administrator a way to purge retained optical-line historical data, for instance after archiving it or following a major fiber repair that renders the old error-second history obsolete for future comparisons. For example, after re-splicing a damaged fiber run, an operator might clear ocnStmHistoryAction bins so future error-rate comparisons start from the repaired baseline.