The control portion may also contain {HEAD ~ control parameters} for {TAIL ~ each specific component} along the transmit or receive path to coordinate the processing of the packets 
for
The control portion may also contain { HEAD ~ control parameters } for { TAIL ~ each specific component } along the transmit or receive path to coordinate the processing of the packets
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH