Time stamp processing method and device for time message in optical transmission network

Abstract

Disclosed is a time stamp processing method for a time message in an optical transport network, comprising: determining time of a message header of a time message and a corresponding first multi-frame number according to a frame header and a multi-frame number of an optical transport network (OTN) frame; acquiring a second multi-frame number corresponding to a message header of a time message, subjected to forward error correction (FEC) decoding or coding, of the OTN frame; obtaining a difference between the first multi-frame number and the second multi-frame number according to a difference calculation rule; and obtaining a final time stamp of the time message according to the time of the message header of the time message and the difference, obtained according to the difference calculation rule, between the first multi-frame number and the second multi-frame number. Also disclosed is a time stamp processing apparatus for a time message in an optical transport network.

Description

technical field [0001] The invention relates to the transmission technology of the optical transmission network, in particular to a processing method and device for the time stamp of the time message in the optical transmission network. Background technique [0002] With the development of the communication network, the Optical Transport Network (OTN) has become the mainstream of the transmission network, and various services are carried by the OTN network. Therefore, the OTN network must be able to provide a high-precision network reference clock to meet the needs of the network. Synchronization requirements of nodes or terminals. [0003] In the prior art, the time transfer is often realized by using the time processing device of the OTN network to process the time message. Due to the need for time synchronization, it is necessary to obtain the time message entering the direction of the time message entering the time processing device. The time stamp of the time processin...

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Problems solved by technology

[0003] In the prior art, the time transfer is often realized by using the time processing device of the OTN network to process the time message. Due to the need for time synchronization, it is necessary to obtain the time message entering the direction of the time message entering the time processing device. The time stamp of the time processing device, in the direction of the time message from the time processing device, it is necessary to obtain the time stamp when the time message is sent out of the time processing device, and the sampling and processing of the time stamp is an essential part. In the OTN network, the OTN frame has undergone processing such as crossing clock domains, framing, and forward error correction (Forward Error Correction, FEC) encoding and decoding. In particular, each reset of the FEC encoding and decoding will bring different frame delays. The sampling time stamp may have a large deviation, which will eventually affect the time synchronization accuracy

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