A read-only counter tracking the number of far-end block errors (FEBE) received by this I/O card, indicating errors detected by the equipment at the far end of the circuit and reported back. FEBE counts tell an admin about signal quality problems on the receive path at the remote end, useful for pinpointing whether a circuit fault lies on the near or far side of the link. A rising FEBE count would tell the admin the far-end equipment is seeing errors on what it receives from this card, pointing to a problem on the transmit path out of this local card or the intervening line.