What do you mean, Unicom's thin cat's LOS light has turned red and is still flashing?

Lighting cat LOS light signal indicator flashes red, indicating that the equipment has not received the light signal.

Suggestion: 1, restart the light cat;

2. Check whether the pipeline is excessively bent and squeezed;

3. Check whether the optical fiber interface is loose and plug in the connector;

If the above methods still can't be solved, you can call the local operator's customer service for broadband troubleshooting.