This attribute controls the behavior of the Dynamic Speed
Reporting mechanism. If its value is empty then the mechanism is
disabled and neither increases nor decreases are reported.
Otherwise, the attribute may contain up to seven threshold levels
which are used to control the reporting of speed increases. Speed
decreases are always reported immediately. If the
measuredSpeedToIf increases such that it reaches one of the
threshold levels which is greater than the last reported speed, the
Trunk starts the speedReportingHoldOff timer. If the speed remains
above this threshold until the timer expires, the Trunk component
then reports the measuredSpeedToIf; otherwise the increase is not
reported.