Count of hard errors; these are errors which
have not been recovered after bscPortRecoveryRetries
number of retries, and therefore the connection
has been terminated.
These errors could be caused by a hardware error
in the line or in the remote device; or possibly
the bscPortRecoveryRetries value is set too low
for the quality of the line.
This count includes all control unit hard
errors on this port, plus errors which were
not for a specific control unit.