This attribute is not applicable and is not displayed on CQC-based
ATM cards.
This attribute counts cells transmitted from the ATM interface
which have the EFCI bit set to 1. This includes cells which arrive at
this interface with EFCI=1, and also cells which are marked with
EFCI=1 as a result of congestion at this interface. This count is
included in the txCell attribute. The counter is reset to zero when
the component is activated, or when any critical attribute of the
component is changed. The counter wraps to zero when it exceeds
its maximum value of (2**64)-1.