Patent ID: 8280055
Filing Date: 2012-10-02
Classification: H04L

Abstract:
1. An optical network system in which an optical line terminal installed in a station and a plurality of optical network units installed in subscribers' homes are connected by an optical distribution network, wherein the optical network unit performs the steps of: when receiving a report message from a set top box, analyzing the report message, storing a group that the set top box belongs to as well as a MAC address in a first table, and transferring the report message to the optical line terminal; when receiving an encryption key generation request from the optical line terminal, generating an encryption key, associating the encryption key with the MAC address in the first table, and transmitting the generated encryption key to the optical line terminal as an encryption key generation response; and when receiving a notice of timing from the optical line terminal, updating the encryption key of the belonging group at the received timing, and wherein the optical line terminal performs the steps of: when receiving a report message from the set top box through the optical network unit, analyzing the report message, storing the group that the set top box belongs to as well as the optical network unit in a second table, and transmitting the encryption key generation request to the optical network unit; and when receiving the encryption key generation response from the optical network unit, further storing the encryption key in the second table, and transmitting the notice of timing in which the encryption key is valid to the optical network unit.