A read-only CwrCwSeverelyErroredSecond value giving the cumulative count of Codeword Severely Errored Seconds detected since the link was last administratively brought up, current as of this operational hour. This hourly SES rollup is what the p2mpSuLink1HrSESAlarmThresh compares against to decide whether to raise the severely-errored-second alarm trap. For example, a subscriber unit whose p2mpSu1HrSevErroredSeconds regularly hovers just under its configured alarm threshold might warrant tightening that threshold to catch a chronic marginal condition before it worsens.