They may alternately be displaced from one another on {HEAD ~ separate line cards} linked by {TAIL ~ a DSP bus} 
linked by
They may alternately be displaced from one another on { HEAD ~ separate line cards } linked by { TAIL ~ a DSP bus }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL