Reports the current count of Severely Errored Seconds accumulated during the active BERT test, i.e. seconds whose error rate exceeded the configured SES threshold. The DESCRIPTION is empty in this MIB, so this reading is inferred from the object name and the related teraBERTSESThreshold objects rather than vendor text. A nonzero SES count during a short test run would flag serious, not just marginal, quality problems on the circuit.