A communication stack for providing remote direct memory access over a datagram network is disclosed. A sliding body is proximally positioned in relation to the main body, and can slide in a parallel manner in relation to the axis thereof. A switching node handles data streams allocated different flow rates and, for any data stream, the internal flow rate through the switching node can be higher than the external flow rate due to null padding of segmented data. Thus, the LCD apparatus may have an enhanced display quality. The spring assembly, which uses two springs exhibiting different spring force, allows adjustment of the relative positions of the two springs in order to control the transition point between the first and second pedal stroke stages. The wireless communication device additionally sends the report during the reporting subframe if the reference subframe is determined.