{HEAD ~ The network processor} is configured to execute a quality of service module, an AG ONU monitor module, a traffic forwarding module and {TAIL ~ an ONU management module} 
{ HEAD ~ The network processor } is configured to execute a quality of service module , an AG ONU monitor module , a traffic forwarding module and { TAIL ~ an ONU management module }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL