This series of equipment is the E1 switch developed on the basis of the special VLSI developed  by our company. Provide 1-8 independent E1 switching protection functions (8 + 16e1). Under  the default working mode, when the main E1 line fails, the equipment will automatically switch  to the standby E1 line for transmission without damage; After the main E1 line is repaired, the  equipment will automatically switch back to the main E1 line for transmission without damage,  and it will work automatically without manual monitoring and operation; It is applied to the  protection of teleconference, video conference and video monitoring system.