If the LOS flashes red, it means that the optical fiber is blocked or the light attenuation is large. The full name of CMCC is China Mobile Communications Group. China Mobile was established on April 20th, 2000. China Mobile is a mobile communication operator based on GSM, TD-SCDMA and TD-LTE networks. China Mobile Communications Group Corporation was officially listed on May 6th, 2000. China Mobile Communications Group has established wholly-owned subsidiaries in 365,438+0 provinces and Hong Kong Special Administrative Region, and China Mobile Communications Group is listed in Hong Kong and new york. After the reorganization of the telecom industry in 2008, Mobile launched a cable broadband Internet service. The slogan of 4G business development is: Mobile 4G, the international mainstream, one step ahead. The current recommendations are as follows:

1. Unplug the fiber head, clean the fiber surface with a cotton ball, and then plug the fiber back in.

2. Check whether the optical fiber line is bent.

3. The red light indicates that the light path is blocked, so call the maintenance personnel to repair or rewire.