Unicom broadband network is disconnected.

1. According to your description, if the LOS light turns red, the light cat LOS light turns red in the following ways:

1 There is something wrong with the optical interface of the optical cat, which needs to be replaced;

2. The connector of indoor tail fiber connecting light cat is loose, and it can be restored by plugging in the connector;

3. Some indoor optical fibers are too bent. Excessive bending of optical fiber will affect the total reflection transmission of optical signals in optical fiber, as long as the optical fiber is straightened;

4. Some outdoor optical fibers are broken or the optical port of equipment in the computer room is faulty, so it is necessary to contact Unicom staff to eliminate the fault.

2. If the above situation cannot be solved, you can pay attention to the customer service staff of China Unicom and report the loss of broadband failure according to the following steps:

[1] Enter the official account of WeChat and click "Customer Service" > "Broadband Obstacle Report" in the lower right corner;

[2] Click the "Broadband Troubleshooting" dialog box and select "Online Troubleshooting";

[3] Fill in the required information such as broadband account number and address, and then click the "Submit" button to complete broadband troubleshooting.