{TAIL ~ The diagnostic information transmission mode} is initiated by transmitting {HEAD ~ an initiate diagnostic link mode message} to a receiving modem accompanied by a cyclic redundancy check  
{ TAIL ~ The diagnostic information transmission mode } is initiated by transmitting { HEAD ~ an initiate diagnostic link mode message } to a receiving modem accompanied by a cyclic redundancy check
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH