This attribute records information about the loading frames that
have been transmitted to the Test component on the target card. The
following data is shown for each priority level:
the number of frames that have been transmitted,
the number of frames that were not returned successfully.
The attribute's value wraps to zero when they exceed the maximum
permitted value.
Note: A loading frame is considered to have been successfully
returned even if it contains bit errors. Frame error statistics are
recorded in the verificationFrmData attribute.