What happened to the light signal?

Optical cat fault, line fault, network fault.

1, light cat failure. If the signal light of the lamp is not on, the first consideration is that the lamp cat is out of order, either damaged or crashed. Once this happens, don't call the maintenance staff in a hurry. Try to turn off the light cat first, then stop 1~3 minutes before turning it on. It is possible to recover. The reason for this situation is that Guang Mao did not restart for a long time, and the data occupied a large number of caches in Guang Mao, which led to the collapse or blockage of the management system in Guang Mao. Restarting is equivalent to clearing the cache once.

2. Line failure. At present, the external lines of light cats are all optical cables. There are some insulating layers and shielding layers in this optical cable, and there is a very thin glass fiber inside. This kind of glass fiber is particularly fragile and will break if you are not careful. In order to increase the toughness of the optical cable and protect the optical fiber from breakage, the operator added a high-hardness steel wire outside the optical fiber, although this steel wire can protect the optical fiber from breakage. However, most families don't know much about this aspect, and often put the extra optical fiber lines in half. If you do this, it may lead to fiber breakage. Once the optical fiber is broken, the light cat will not receive the optical signal, and the light cat's signal lamp will not flash or glow red. You can check the line first. If the external optical fiber is damaged, you can call the maintenance personnel and ask them to replace it at home.

3. Network failure. If you often watch TV or surf the Internet, you must have seen such slogans as "So-and-so was caught stealing optical cable" or "If the optical cable is broken, you will lose millions". In fact, they broke the trunk or sub-trunk that we used to surf the Internet. It is also possible to cut off the optical cable in windy weather and underground construction. If this happens, it may lead to network paralysis in a certain area and directly affect the network connection in a certain area. If your area happens to be this area, then the light cat's signal light will not light up or flash red, and the network can only be restored after the network operator repairs the line.