This is the Unavailable Seconds count for the far end, again accrued only after ten consecutive far-end SES, for the currently-accumulating 15-minute window. A far-end value climbing while near-end UASs stays flat tells an admin the remote site is experiencing an outage-level condition specifically in the direction of traffic reaching it, which is important when a customer at the far-end location reports a problem that this local box's own near-end counters don't reflect. A far-end reading of 900 (the full window) alongside a near-end UASs of 0 would indicate the outbound direction toward the remote site was completely unavailable for the entire 15 minutes while the return path stayed up.