The total duration of new and past OAM loopback
timeout alarms that were active during this 15
minute interval.
For example, if the an alarm lasted for a total of
50 seconds and crossed interval boundaries.
In the previous 15 minute interval it lasted for
30 seconds and 20 seconds in the current 15 minute
interval. There is a new alarm that lasted for 15
seconds in the current 15 minute interval as well.
Thus, this object will have a value of 20+15 = 35 seconds.