This read-only Integer32 reports how many Far End Path Block Errors the OC-3 optical port logged during the just-completed 15-minute interval. Because it is the 'previous' bucket rather than the still-accumulating current one, an admin can read a stable, final count to judge whether the far-end path had a block-error problem in the last quarter hour without racing a counter that is still incrementing. For example, after a fiber patch was reseated, an admin polls this value at the top of the next 15-minute boundary to confirm the far-end block-error count dropped back to near zero.