That is, {HEAD ~ both the frequency} of {TAIL ~ change} in the delay and the level of delay or phase difference depend on the jitter control signal 
of
That is , { HEAD ~ both the frequency } of { TAIL ~ change } in the delay and the level of delay or phase difference depend on the jitter control signal
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH