acSonetPortTimeElapsed 1.3.6.1.4.1.2785.2.3.6.1.1.1.1.8

The number of seconds, including partial seconds, that have elapsed since the beginning of the current measurement period. If, for some reason, such as an adjustment in the system's time-of-day clock, the current interval exceeds the maximum value, the agent will return the maximum value.