This object reports a 32-bit counter of Severely Errored Seconds (SES) for an ODU facility during a historical 1-day period. A Severely Errored Second is defined as a 1-second interval where the error rate exceeds a critical threshold (typically more than 30% error events), indicating severe signal degradation. Monitoring SES is critical for identifying catastrophic link failures or fiber cuts, as a single high SES count usually warrants immediate investigation, with example values ranging from 0 to 86400.