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