METHOD FOR SWITCHING DATA LINK IN THE OPTICAL NETWORK SYSTEM, OPTICAL LINE TERMINAL AND SYSTEM

摘要

The embodiments of the present invention disclose a method for switching data link in the optical network system, an optical line terminal and an optical network system. Wherein the method includes: while a service is switched from the first optical line terminal to the second optical line terminal, the second optical line terminal performs the following process steps: transmitting the first notification message to the optical network unit which connects to the optical splitter in the optical network system to notify the optical network unit enter an operation state; transmitting the bandwidth mapping that the uplink data transmission requires to the optical network unit; receiving the uplink data transmitted from the optical network unit responding to the bandwidth mapping, and determining the delay from the time that bandwidth mapping is transmitted to the time that the uplink data is received as the zero distance equalization delay between the second optical line terminal and the optical network unit by monitoring the processes that transmitting the bandwidth mapping and receiving the uplink data. The embodiments of the present invention can reduce the service break off time of the optical network system due to the failure of the backbone fiber or the master optical line terminal, and the service break off time can be controlled within 50ms.