Clock synchronization method, optical head end, and optical terminal

A method for clock synchronization, applied to an optical bus network, wherein the optical bus network comprises a controller, an optical head end, a plurality of optical terminals, and a plurality of slave stations, the plurality of optical terminals comprise a first optical terminal, the plurality of slave stations comprise a first slave station connected to the first optical terminal, and the method comprises:

• receiving, by the first optical terminal, a packet from the optical head end, wherein the packet comprises service data from the controller and time information, and the time information indicates an execution time point at which the plurality of slave stations perform an operation based on the service data simultaneously, wherein the time information comprises reference time that indicates a time point at which the optical head end receives the service data;
• determining, by the first optical terminal, the execution time point based on the time information;
• and
• controlling, by the first optical terminal, the first slave station to perform the operation at the execution time point based on the service data simultaneously with another slave station in the plurality of slave stations.

An optical head end, wherein the optical head end comprises:

• a transceiver, configured to receive a first packet from a controller, wherein the first packet comprises service data to be transmitted to a plurality of slave stations;
• and
• at least one processor, configured to generate a second packet based on the first packet, wherein the second packet comprises the service data and time information, and the time information indicates an execution time point at which the plurality of slave stations perform an operation based on the service data simultaneously, wherein the time information comprises reference time that indicates a time point at which the optical head end receives the service data, wherein:
• the transceiver is further configured to send the second packet to a plurality of optical terminals to instruct the plurality of optical terminals to control the plurality of slave stations to perform the operation at the execution time point based on the service data simultaneously.

An optical terminal, wherein the optical terminal comprises:

• a transceiver, configured to receive a packet from an optical head end, wherein the packet comprises service data from a controller and time information, and the time information indicates an execution time point at which a plurality of slave stations perform an operation based on the service data simultaneously, wherein the time information comprises reference time that indicates a time point at which the optical head end receives the service data;
• and
• at least one processor, configured to determine the execution time point based on the time information, wherein:
• the transceiver is further configured to control a first slave station connected to the optical terminal to perform the operation at the execution time point based on the service data simultaneously with another slave station in the plurality of slave stations.