Therefore, if the data length of the transmission data to be transported by the feedback frame on the reception side is shorter than the predetermined data length which derives from the format of the frame, then {HEAD ~ the feedback frame} can be transmitted from {TAIL ~ the reception side} to the transmission side without changing the format of the feedback frame and lowering the reception rate 
transmitted from
Therefore , if the data length of the transmission data to be transported by the feedback frame on the reception side is shorter than the predetermined data length which derives from the format of the frame , then { HEAD ~ the feedback frame } can be transmitted from { TAIL ~ the reception side } to the transmission side without changing the format of the feedback frame and lowering the reception rate
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