Patent ID: 7853801

Claim:
A GPON (Gigabit-cable passive optical network) system for allowing a secured transmission through an authenticated encryption, comprising: an OLT (optical line terminal) for receiving data from an external service provider, generating a GTC (GPON Transmission Convergence) downlink frame including a frame header and a payload and transmitting the generated GTC downlink frame through a downlink; and an ONU (optical network unit) for receiving the GTC downlink frame transmitted from the OLT through the downlink and processing the received GTC downlink frame, wherein the OLT performs an authenticated encryption on the generated GTC downlink frame including the frame header and the payload by including an authentication generator for authenticating the generated GTC downlink frame according to the ONU, and the ONU determines whether the GTC downlink frame is allowed to receive according to whether the authentication of the authentication encrypted GTC downlink frame is succeeded or failed by including an authentication checker.