If the LOS light is blinking red on your fiber router or ONT, it usually means Loss Of Signal. This guide explains the meaning, common causes, safe home checks, and when the issue needs technician support. LOS means the fiber signal is not reaching the ONT/router properly. Service Outage: ISP maintenance or a local service outage can interrupt your connection. ”. If you find that the Optical/Config/PON Light on your Fibre ONT (Optical Network Terminal) box is flashing, has gone off, or has gone red, this indicates there may be an issue with the fibre connection coming into your property. What Can I Do? First, please check that the optical cable which comes. The intermittent LOS red flash is more likely caused by the ONT/modem, its power supply, a bad connector/adapter, or a problem on the provider side than by the skirting board periodically “pinching” the fiber [#17660890] [#17660916] [#17661066] Fiber normally does not behave like a cable that. Fiber can be fusion spliced and also mechanically splced which is just 2 fibers butted up against each other with index matching gel to make up the difference.
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