Per its DESCRIPTION, this Counter64 counts one-second intervals where the DS3 Line-layer error density crossed the severity threshold. Because this row is the short interval still actively filling right now, a reading here means the DS3 line had a run of severely errored seconds on this DS3 circuit, and because the interval has not closed yet, the count will keep climbing until it does and rolls into the history table. For example, a reading of 7 seconds in this bin on this DS3 circuit climbing while Loss stays at zero suggests noise or crosstalk on the copper pair rather than a full disconnect.