Communication board and communication device

A communication device, comprising:

• a chassis including a plurality of slots;
• and
• a plurality of communication boards, wherein each communication board is positioned in a corresponding slot in a pluggable manner;
• a housing including a top portion and a bottom portion positioned opposite to each other, and a side wall connected between the top portion and the bottom portion, and a mounting cavity defined by the top portion, the bottom portion, and the side wall of the housing;
• a first trigger component mounted in the housing, at least a partial structure of the first trigger component extending in the mounting cavity, the first trigger component being movable relative to the housing during insertion and removal of the communication board in the corresponding slot of the chassis to permit the first trigger component to switch between a trigger position and a non-trigger position relative to the housing;
• a transmission component positioned in the mounting cavity and connected to the first trigger component, the transmission component being displaceable relative to the housing in a first direction when being driven by the first trigger component to switch between a first position and a second position relative to the housing;
• and
• a backflow prevention component connected to the transmission component and positioned on a side of the first trigger component away from the bottom portion of the housing, the backflow prevention component comprising a backflow prevention plate positioned on an outer side of the housing, and being rotatable relative to the housing when being driven by the transmission component to switch between a closed state and an open state, wherein:
• when the backflow prevention plate is in the closed state, the backflow prevention plate is attached to the side wall of the housing, and the transmission component is located at the first position;
• when the backflow prevention plate is in the open state, the backflow prevention plate is open relative to the side wall of the housing, an included angle between the backflow prevention plate and the side wall of the housing is an acute angle at which an opening faces the bottom portion of the housing, and the transmission component is located at the second position;
• when the first trigger component is located at the non-trigger position, the transmission component is located at the first position, and the backflow prevention plate is in the closed state;
• when the first trigger component switches from the non-trigger position to the trigger position, the transmission component is displaceable from the first position to the second position when being driven by the first trigger component, to drive the backflow prevention plate to move from the closed state to the open state;
• and
• wherein the plurality of slots and the plurality of communication boards are in a one-to-one correspondence, each of the plurality of communication boards is disposed in the corresponding slot in a pluggable manner, and the backflow prevention plate on the communication board is configured to seal the slot adjacent to the communication board in the communication device.