{HEAD ~ The jittering test signal} is used to test {TAIL ~ equipment} to determine the effect of the jittering signal on the equipment 
{ HEAD ~ The jittering test signal } is used to test { TAIL ~ equipment } to determine the effect of the jittering signal on the equipment
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH