Time synchronization method and device and PTP system

Abstract

The invention discloses a time synchronization method and device and a PTP system. When the time synchronization method is applied to transparent clock equipment, the method comprises the following steps: monitoring a signal pulse sent by main clock equipment in an out-of-band mode, and extracting the frequency and phase of the signal pulse to be respectively used as a main clock frequency and a main clock phase; inserting the main clock frequency and the main clock phase into a corresponding position of an extension field in an organization vendor information format in a common PTP signal message generated in advance, and then transmitting the modified PTP signal message to a PTP port; and receiving the modified PTP signal message transmitted by the PTP port, extracting the main clock frequency and the main clock phase carried in the modified PTP signal message, and modifying the local clock frequency and / or local clock phase according to the main clock frequency and the main clock phase. Through the adoption of the method disclosed by the embodiment of the invention, a PTP protocol is extended, so that the clock equipment synchronization result in the PTP system is more precise.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically, to a time synchronization method, device and PTP system. Background technique [0002] With the development of network technology, distributed system technology is more and more used in the field of measurement and control, these technologies include network communication, local computing, distributed objects and so on. Many applications need to use the time generated by the device node clock. If there is no standard protocol to synchronize the time of each node in the distributed system, then these devices will not be able to achieve some real-time synchronization control functions. Some existing time synchronization protocols are not suitable for use in the field of distributed measurement and control, such as the Network Time Protocol (NTP), which is mainly used for the synchronization of large-scale systems, and its accuracy generally only reaches the mill...

AI Technical Summary

Problems solved by technology

However, this method has the problem that the obtained local clock rate and the master clock rate are too large. For example, affected by various factors such as the network environment, the PTP end-to-end transparent clock device sends each Sync message periodically to the master clock. It is impossible to forward strictly according to a specific period, and it can only roughly estimate the sending period of a Sync message, which makes it difficult to guarantee the accuracy of the dwell time

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