US Patent 10321607 Receptacle assembly and transceiver module assembly

When an optical module is inserted into a compartment of a receptacle cage in a state where a heatsink is detached from the receptacle cage, a tip end portion of a protection wall portion of the optical module comes into contact with end portions of guide pieces of a guide plate even if the optical module is inserted with the protection wall portion being lifted up, and the tip end portion of the protection wall portion is thereby pushed down and guided to a clearance below the guide pieces.