The first time difference may be a time difference between rising edges of {HEAD ~ a first component} of the differential signal and a second component of {TAIL ~ a phase shifted signal} 
The first time difference may be a time difference between rising edges of { HEAD ~ a first component } of the differential signal and a second component of { TAIL ~ a phase shifted signal }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL