The common format includes {TAIL ~ at least the transmission data length}, the transmission data, the data frame number and the repeat request frame number, and is added with {HEAD ~ the error detection code} for all the data 
The common format includes { TAIL ~ at least the transmission data length } , the transmission data , the data frame number and the repeat request frame number , and is added with { HEAD ~ the error detection code } for all the data
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH