This series of equipment is an E1 switch developed based on our company's specialized ultra large scale integrated circuit. Provide 2 independent E1 switching protection functions. In the default working mode, when the main E1 line fails, the equipment will automatically switch to the backup E1 line for transmission without damage; After the main E1 line is repaired properly, the equipment automatically switches back to the main E1 line transmission without any damage, and works fully automatically without the need for manual monitoring and operation; Applied to telephone conferences, video conferences, and video surveillance system protection.