The invention discloses a Ethernet traffic testing system for determining a packet errorrate of a link between an optical network unit (ONU) and an optical line terminal (OLT). The system determines that the ONU detects a test message from the OLT. The system then causes the ONU to send data received from the OLT back to the OLT. Further, the system causes the OLT to reflect back data received from the ONU in order to form a closed loop. The system then causes the OLT to inject data bits in the closed loop till the number of bits circulating in the closed loop saturate the link between the OLT and the ONU. Once the link is saturated, the system determines the packet errorrate of the data bits in the closed loop. Finally, the system causes the OLT and ONU to remove the closed loop by not sending back the received data.
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Howarth, Sean; Dong, Ke; Wu, Xinfa; Nguyen, Huy; and Tran, Brian, "LINE RATE ETHERNET TRAFFIC TESTING", Technical Disclosure Commons, (August 29, 2016)