This Gauge reports the number of RFI failures reported by the far end during one specific historical 15-minute interval in the past 24 hours. An admin cares because a nonzero historical FC at a specific interval identifies precisely when the remote end was actively flagging failures back toward this device, useful for pinpointing exactly when a transmit-side fault window occurred. For example, an FC of 3 at one specific historical interval, with zero at neighboring intervals, isolates a brief, contained event rather than a sustained problem.