This attribute specifies two interval times. It is a vector indexed by
(set clear). The set value specifies the period of time for which the
trunk utilization must be above the utilization threshold specified by
adaptationThreshold before the corresponding degree of adaptation
is triggered. The clear value specifies the period of time for which
the trunk utilization must be at or below the utilization threshold
specified by adaptationThreshold before the PORS adaptationLevel
is decreased by one (1).