{HEAD ~ The OLT} restarts {TAIL ~ communication} with the ONU over the optical line upon receipt of data traffic for the ONU 
restarts
{ HEAD ~ The OLT } restarts { TAIL ~ communication } with the ONU over the optical line upon receipt of data traffic for the ONU
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