The transmission data length is set to {HEAD ~ the arbitrary data length}, and {TAIL ~ thereafter an error} detecting code for all the data is added therewith 
The transmission data length is set to { HEAD ~ the arbitrary data length } , and { TAIL ~ thereafter an error } detecting code for all the data is added therewith
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH