Time synchronization method and device

Abstract

A time synchronization method and device, the time synchronization method includes: a receiving end device receives a first time stamp sent by a sending end device and receives a first frame header signal sent by the sending end device, where the first time stamp indicates a first channel The first moment when the media conversion module sends the first frame header signal, the moment when the receiver device receives the first frame header signal is the second moment; the second frame header signal is sent to the sender device, and the receiver device sends the second frame The time of the header signal is the third time; the fourth time stamp sent by the sending end device is received, and the fourth time stamp indicates the fourth time when the sending end device receives the second frame header signal; according to the first time, the second time, The third time and the fourth time are time-synchronized with the sending end device. By implementing the embodiments of the present invention, the accuracy of time synchronization can be improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a time synchronization method and equipment. Background technique [0002] In a communication network, the normal operation of services sometimes requires network time synchronization, that is, the time difference between network devices is kept within a reasonable error level. The 1588V2 protocol is a precise time synchronization protocol, referred to as precision time protocol (precision time protocol, PTP), which can realize time synchronization of multiple network devices. [0003] The 1588V2 protocol can synchronize the time of the receiving end device with the time of the sending end device through the combination of software and hardware. The stamping point can be defined in the protocol stack. In the receiving end device that needs to be synchronized, when the PTP message passes through the stamping point, a time stamp is generated, and the time stamp is c...

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Problems solved by technology

[0004] When the sending device and the receiving device transmit PTP messages, they need to convert the information media through the channel media conversion module. For example, the channel media conversion module (such as an optical module) of the sending device converts the PTP message carrying the time stamp into The signal (such as optical signal) that can be transmitted on the corresponding channel medium is sent to the channel medium conversion module of the receiving end device through the channel medium (such as optical fiber), and the channel medium conversion module of the receiving end device converts it into an electrical signal for identification and carrying When the time-stamped PTP message is converted in the channel media conversion module, due to the difference in signal processing type, signal processing amount, etc., the delay is unstable, thereby reducing the accuracy of time synchronization

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