Therefore, it will take a signal {TAIL ~ 200 uS} to complete {HEAD ~ the roundtrip} 
Therefore , it will take a signal { TAIL ~ 200 uS } to complete { HEAD ~ the roundtrip }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD