This gives the far-end Unavailable Seconds recorded within one specific completed 15-minute bucket, using the same ten-consecutive-SES entrance rule applied to remote-reported data. A technician reconstructing a customer's outage window can look for the specific interval where far-end UASs jumps above zero to establish, down to the quarter-hour, when the outbound direction actually became unavailable rather than merely errored. An interval showing 300 far-end UASs out of the possible 900 seconds means a third of that specific quarter-hour was counted as unavailable in the direction heading toward the remote site.