This read-only CwrCwSeverelyErroredSecond value reports the number of Codeword Severely Errored Seconds detected since link power-up, as captured at the timestamp recorded in cwr24HrUpdateTime. It gives an admin the severely-errored-seconds figure for that specific 24-hour reporting entry, tracking the more serious class of error events on a daily basis. For example, an admin doing a monthly SLA reconciliation would sum cwr24HrSevErroredSeconds across the month's daily entries to report total severe outage time.