This is the threshold object which the management
station sets to determine if it gets breached. It
indicates the statistic being sampled was
falling.
When current sample is less than or equal
to this object, and the value at the last sampling
interval was greater than this object (in other
words the value is falling), an entry in the
cnpdThresholdHistoryTable will be created.
After a falling event is generated, another
such event will not be generated until the sampled
value rises above this object and reaches the
cnpdThresholdConfigRising value.