USource 1U plug-in optical port Bypass switch is an optical path control device that can be used to protect optical equipment and bypass the protected equipment when a fault occurs (power interruption, hardware failure, software deadlock, etc.) nodes to ensure that the network is not affected. It has functions such as power-down bypass and non-heartbeat signal bypass. The device supports independent control operations for each optical link. Optical bypass switches (optical bypass switches) support two working states: Normal and Bypass. In Normal operating mode, the switch transfers network traffic to the connected network device system. In Bypass operating mode, network traffic will be transferred to the pass-through network inside the fiber-optic Bypass switch. Mainly used for protection of flow control equipment, repeater optical equipment, etc.