This is a bitmask reporting the current DS3 Far End Alarm and Control (FEAC) status received from the far end of this circuit, covering conditions like far-end LOS, out-of-frame, AIS received, or a loopback-received acknowledgment. Because FEAC rides in the DS3 C-bit overhead (see pportCbitParity), this object on this port is your only visibility into what fault the equipment at the other end of the circuit is actually experiencing, without needing to call the far-end site. A value with bit 8 set (AIS received) on this port means the far end is currently receiving an alarm indication signal, telling you the fault is somewhere beyond that far-end device rather than on this local circuit.