The invention is adapted to acquire more useful log data. A master device (4) includes a timer element (45), adapted to acquire a moment; an instruction sending element (421), adapted to synchronize a moment measured by a slave timer element (14) of slave devices (1-3) with a moment acquired by the timer element (45) according to a time synchronization instruction containing moment information corresponding to the moment acquired by the timer element (45); and a slave log receiving element (423), adapted to receive slave logs (131).

The embodiments of the present disclosure provide a synchronous control method and a synchronous control system. The synchronous control method includes: acquiring respectively response durations during which multiple controlled components execute their corresponding control instructions; determining respectively instruction execution delay durations corresponding to the multiple controlled components according to the response durations during which the multiple controlled components execute their corresponding control instructions, and controlling the multiple controlled components to execute their corresponding control instructions according to the instruction execution delay durations corresponding to the multiple controlled components, such that the multiple controlled components are able to complete their corresponding operations synchronously.

The invention is adapted to acquire more useful log data. A master device (4) includes a timer element (45), adapted to acquire a moment; an instruction sending element (421), adapted to synchronize a moment measured by a slave timer element (14) of slave devices (1-3) with a moment acquired by the timer element (45) according to a time synchronization instruction containing moment information corresponding to the moment acquired by the timer element (45); and a slave log receiving element (423), adapted to receive slave logs (131).

This application relates to clock synchronization methods optical head ends, and optical terminals. In an example method, the optical head end receives a first packet from a controller. The first packet includes service data to be transmitted to a plurality of slave stations. The optical head end generates a second packet based on the first packet. The second packet includes the service data and time information. The time information indicates an execution time point at which the plurality of slave stations perform an operation based on the service data. The optical head end further sends the second packet to the plurality of optical terminals to request 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.

The embodiments of the present disclosure provide a synchronous control method and a synchronous control system. The synchronous control method includes: acquiring respectively response durations during which multiple controlled components execute their corresponding control instructions; determining respectively instruction execution delay durations corresponding to the multiple controlled components according to the response durations during which the multiple controlled components execute their corresponding control instructions, and controlling the multiple controlled components to execute their corresponding control instructions according to the instruction execution delay durations corresponding to the multiple controlled components, such that the multiple controlled components are able to complete their corresponding operations synchronously.