This read-write control lets an admin reset all the counters associated with this physical line, such as atmLineTotalRcvCells and atmLineRcvHecErrorCells, by writing the value resetCounters(2); writing noAction(1) has no effect. It's useful after resolving a line fault, so the counters start fresh and future error-rate calculations aren't skewed by pre-fix history. After replacing a suspect cable that was generating HEC errors, an admin would write resetCounters to atmLineCntClrButton to zero out the accumulated error count before monitoring for recurrence.