The number of frame errors that must occur for this event to
be triggered. The default value is one frame error. If the
threshold value is zero, then an Event Notification OAMPDU is
sent periodically (at the end of every window). This can be
used as an asynchronous notification to the peer OAM entity of
the statistics related to this threshold crossing alarm.
If hwDot3ahEfmErrFrameThreshold frame errors occur within a window
of hwDot3ahEfmErrFrameWindow (in tenths of seconds), an Event
Notification OAMPDU should be generated with an Errored Frame
Event TLV indicating the threshold has been crossed in this
window.