This read-only field describes the automatic reaction mode when this port detects loss of signal on the opposite direction of the fiber link, typically involving laser shutdown for safety reasons. Network engineers use this to understand safety protections that prevent hazardous laser reflections and to plan optical network redundancy. For example, 'forwardErrorDisable' means the transmit laser shuts down immediately if signal loss is detected in the reverse direction, while 'forwardErrorContinue' means transmission continues despite the reverse link failure.