This read-only Gauge reports the number of Errored Seconds encountered by this DS1 interface in the current 15-minute interval, i.e., how many one-second windows so far in this bin contained at least one error event. This is the most basic performance indicator for the ongoing interval, giving an admin an early read on link health before the interval completes and rolls into the historical dsx1Interval* table. An engineer monitoring a DS1 during a suspected degradation event would watch dsx1CurrentESs climb in near-real-time rather than waiting up to 15 minutes for the interval to close and populate the historical table.