During the normal operation procedure, {HEAD ~ the differential signal} is driven by {TAIL ~ the accurate current} to the panel resistor 
is driven by
During the normal operation procedure , { HEAD ~ the differential signal } is driven by { TAIL ~ the accurate current } to the panel resistor
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH