The red light on the fiber optic switch is always on

A solid red light on a fiber optic switch indicates a Loss of Signal (LOS), meaning the device cannot communicate with your Internet Service Provider (ISP).Common CausesFiber Optic Cable Issues: Physical damage, bends, or loose connections in the fiber optic cable can disrupt the signal and trigger a red LOS light .Service Outage: ISP maintenance or local network outages can cause a total loss of signal .Faulty Hardware: A malfunctioning Optical Network Terminal (ONT) or switch may prevent proper communication with the ISP .Power Problems: Unstable or insufficient power supply to the device can result in a red light .Troubleshooting StepsCheck for ISP Outages: Visit your ISP's website or social media pages to confirm if there is a known service disruption .Inspect Fiber Connections: Ensure the fiber optic cable is securely connected to the ONT or switch and check for visible damage or sharp bends .Restart the Device: Power off the switch or ONT, wait 30 seconds, and power it back on to reset temporary faults .Test Power Supply: Make sure the device is receiving stable power, and try connecting it directly to a wall outlet if using a surge protector .Contact Your ISP: If the red light persists, report the issue to your ISP. They can check the network from their end and dispatch a technician if necessary .Additional NotesThe red LOS light on the ONT is more critical than other router lights; focus on this when reporting the issue to your ISP .If neighbors on the same network segment are also offline, the problem may be upstream in the ISP's network . Following these steps usually helps identify whether the issue is local (cabling or device) or external (ISP outage), allowing for a faster resolution.