This attribute indicates the total number of one second intervals for
which the STS/STM far-end path is unavailable. The far-end path
becomes unavailable at the onset of 10 consecutive FEPSESs. The
10 FEPSESs are included in the unavailable time. Once unavailable,
the far-end path becomes available at the onset of 10 contiguous
seconds with no FEPSES. The 10 seconds with no FEPSES are
excluded from the unavailable time. For second intervals where a
Far-End Path Unavailable Second (FEPUAS) is counted, counting
of FEPCV, FEPES, FEPSES and FEPALS is inhibited.