This gauge counts background errored blocks (individual data frames with bit errors but not severe enough to cause a full line failure) that the remote equipment detected in the current 15-minute interval. An engineer uses this to detect chronic data corruption before it becomes severe — a steady climb in BBEs often precedes a full line outage. For instance, a value of 1200 means 1200 corrupted data blocks arrived on the far end this interval, suggesting a noisy line that needs investigation.