The ONU management module is configured to receive a message from the ONU that {HEAD ~ the ONU} has switched to {TAIL ~ an active mode} from the sleep mode to receive the received data traffic from the OLT over the optical line 
switched to
The ONU management module is configured to receive a message from the ONU that { HEAD ~ the ONU } has switched to { TAIL ~ an active mode } from the sleep mode to receive the received data traffic from the OLT over the optical line
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH