Loss of Signal (LOS) in fiber internet refers to the interruption or complete loss of the optical signal transmitted through the fiber-optic cable.

When LOS occurs, the connection may blink red or show a solid red indicator to signal the disruption. Always observe the LOS indicator on your router before reporting a loss of signal.

 

It can be caused by physical damage, signal attenuation over long distances,  equipment failure, signal interference, or accidental cuts.

SwiftNet engineers always use redundancy measures and regular maintenance help minimize its impact.