The quality of service module is configured to check whether {HEAD ~ the received data traffic} for {TAIL ~ the ONU} has a high priority and low bandwidth requirement 
for
The quality of service module is configured to check whether { HEAD ~ the received data traffic } for { TAIL ~ the ONU } has a high priority and low bandwidth requirement
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH