This object is the number of frames of valid
frame length that have been received on this port.
This counter is incremented by one for each frame
received on this port whose OctetCount is greater
than or equal to minFrameSize and less than or
equal to maxFrameSize (Ref: IEEE 802.3 Std,
4.4.2.1) and for which the FCSError and
CollisionEvent signals are not asserted.
This statistic provides one of the parameters
necessary for obtaining the packet error rate.
The approximate minimum time for rollover of this
counter is 80 hours.