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