Method for realizing sub-microsecond synchronization accuracy based on PTP (Precision Time Protocol)

Abstract

The invention relates to a method for realizing sub-microsecond synchronization accuracy based on a PTP (Precision Time Protocol), belonging to the technical field of communication; in order to obtain high-accuracy synchronization efficiency and save hardware investment cost, the method comprises the following steps: before a master time sends synchronization messages, synchronizing a clock and a clock source of an Ethernet transceiver; obtaining average path delay of links by a delay request information packet delay measuring mechanism or measuring a waiting delay information packet delay measuring mechanism; and performing asynchronous correction on the links so as to realize sub-microsecond synchronization accuracy. In the method, the DP83640 Ethernet transceiver is adopted, network message time stamp can be exactly obtained, the PTP protocol on an AT91RM9200 platform is realized, and sub-microsecond synchronization accuracy can be realized. Via test, the synchronization accuracy can be up to 100ns; and the whole system is low in cost, excellent in openness and expandability, and easy to implement.

Description

Method of Realizing Sub-microsecond Synchronization Accuracy Based on PTP Protocol technical field The invention relates to the field of communication technology, in particular to a method for realizing sub-microsecond synchronization accuracy based on the PTP protocol. Background technique IP is the development trend of future network services. Ethernet has become the main development direction of IP-based bearer network due to its superior cost performance, wide application and perfect product support. When deploying carrier-grade Ethernet, how to solve the problem of clock synchronization is an aspect to be considered. At present, there are two aspects to the synchronization requirements of the packet network: 1. The packet network needs to be able to carry TDM services and provide a clock recovery mechanism for TDM services, so that TDM services still meet certain performance indicators after passing through the packet network; 2. The packet network It needs to be abl...

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the present invention is: how to overcome the problem that the synchronization effect and price cost cannot be achieved in the prior art, and how to save the cost of hardware investment while obtaining high-precision synchronization efficiency

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