This attribute indicates the total number of one second intervals for
which the E3 path is unavailable. The E3 path becomes unavailable
at the onset of 10 consecutive Path Severely Errored Seconds
(PSES). The 10 PSESs are included in the unavailable time. Once
unavailable, the E3 path becomes available at the onset of 10
contiguous seconds with no PSES. The 10 seconds with no PSES
are excluded from the unavailable time. For second intervals where
PUAS is counted, counting of Path Code Violations (PCV), Path
Errored Seconds (PES), Path Severely Errored Seconds (PSES) and
Path SefAis Seconds (PSAS) is inhibited.