PON SYSTEM HAVING ENCRYPTION FUNCTION AND ENCRYPTION METHOD OF THE PON SYSTEM

摘要

In a PON system where variable-length packets are transmitted, a time is synchronized in advance between an optical network unit (13) and an optical line terminal (15), a new encryption key generated by any one of the optical network unit and the optical line terminal is transmitted to the other so that the new encryption key is stored in each of them, and any one of the optical network unit and the optical line terminal transmits a notification of an encryption key changing time to the other, and the optical network unit and the optical line terminal change the encryption key to a new encryption key at the encryption key changing time. Accordingly, even in the PON system where the variable-length packets are transmitted, the timing for changing the encryption key can be synchronized between the optical network unit (13) and the optical line terminal (15).