10G/1G dual-rate EPON OLT LSI with dual encryption modes alternated using DBA-information-based algorithm control

We developed a 10G/1G dual-rate EPON OLT LSI that fully conforms to the IEEE 802.3av standard. To support three types of ONUs (GE-ONU and symmetric/asymmetric 10G-ONUs), we adopted the 802.1AE algorithm for 10G encryption and also use the conventional GE-PON encryption algorithm, which was adopted for 1G encryption before 802.1AE standardization in 2006. For a higher level of time-division-multiplexing passive optical network security, we implemented a dynamic-bandwidth-allocation-information-based method for algorithm control in order to dynamically change the decryption algorithms at the OLT corresponding to the ONUs' encryption algorithms. In addition, we widened the category of encrypted frames to include multipoint MAC control protocol (MPCP) frames and operation, administration, and maintenance (OAM) frames, by adding three simple steps of functions to existing blocks with little hardware overhead.