This attribute indicates the total number of Path Errored Seconds
(PESs) that have been counted. A PES is declared for second
intervals containing one or more Path Code Violations (PCV) or one
or more Severely Errored Frame (SEF) or Alarm Indication Signal
(AIS) defects. Counting of Path Errored Seconds is inhibited when
Path Unavailable Seconds (PUAS) is counted over the monitored
second.