China Telecom is responsible for military, political, civil and national defense communications. With the development of science and technology and communication, communication services are currently diverted by China Mobile and China Unicom, but China Telecom still dominates. China Telecom's power supply for communication will automatically start to generate power when the mains power is suddenly supplied, because the mains power is cut off for a few seconds and minutes, and it is directly supplied by a large-capacity fixed battery, which can also guarantee the power supply standard of 6-8 hours. Therefore, maintaining communication power supply is the key to ensure the stability and quality of communication.