| abstract |
The terminal (20) for use with an optical access network system transmits a data stream containing information that is churned by using a churning key. The terminal (20) comprises flag control means (21) for controlling flags when sending the data stream to a receiving end, churning parameter transmission control means (22) for controlling transmission of churning parameters to the receiving end, based on the status of the flags, the churning parameters indicating where logical connections are churned or not churned, and churning parameter updating means (24) for updating the churning parameters at a churning key updating time point where the churning key is updated. |