COMMUNICATION SINGLE BOARD AND COMMUNICATION DEVICE

The present application provides a communication single board and a communication device. A mounting cavity is formed in a housing of the communication single board. A first trigger assembly is mounted on the housing. In the process that the communication single board is inserted into/pulled out from a slot, the first trigger assembly can move relative to the housing, and a transmission assembly can move relative to the housing under drive of the first trigger assembly. A backflow prevention assembly is connected to the transmission assembly, and a backflow prevention plate arranged on the outer side of the housing can rotate relative to the housing under drive of the transmission assembly and is switched between a closed state and an open state. When the backflow prevention plate is in the open state, the backflow prevention plate is opened relative to the side wall of the housing, and the included angle between the backflow prevention plate and the side wall of the housing is an acute angle with the opening