This object contains the average one-way availability flr in the backward
direction, from among the set of availability flr values calculated by
the MEP in this Measurement Interval. There is one availability flr
value for each 'delta_t' time period within the Measurement Interval, as
specified in MEF 10.2.1.
The flr value is a ratio that is expressed as a
percent with a value of 0 (ratio 0.00) through 100000 (ratio 1.00).
Units are in milli-percent, where 1 indicates 3458 0.001 percent.