STATION SIDE DEVICE, HOUSE SIDE DEVICE, OPTICAL COMMUNICATION SYSTEM, AND METHOD FOR CONTROLLING OPTICAL COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a technology that allows an ONU to decrypt encrypted data from an OLT after the ONU has returned to a frame receivable state if the ONU temporarily stopped receiving a frame.

SOLUTION: An OLT transmits to an ONU a cipher frame that can be decrypted if a time stamp is synchronized between the OLT and the ONU. The OLT transmits a cipher frame including a time stamp of the OLT to the ONU to have the time stamp synchronized between the OLT and the ONU. If the ONU is in a sleep mode, when the ONU returns from the sleep mode, the OLT transmits a non-cipher frame including a time stamp of the OLT to the ONU to have the time stamp synchronized between the OLT and the ONU, and after this transmits a cipher frame to the ONU.

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