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Method, device and system for synchronizing time in OTN (Open Transport Network)

A time synchronization, first time technology, applied in time division multiplexing systems, transmission systems, synchronization devices, etc., can solve the problems of asymmetric transmission delay, instability, and transmission time is not a stable value.

Inactive Publication Date: 2015-05-06
SANECHIPS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If either of these two conditions is not satisfied, it will have a great impact on the accuracy of synchronization.
In the OTN network, because OTN frames go through various processes such as encapsulation, mapping, and encoding, the transmission time of the OTN network is not a stable value.
Therefore, in order to realize the high-precision 1588 time synchronization function in the OTN network, it is necessary to solve the problem of asymmetrical and unstable transmission delay

Method used

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  • Method, device and system for synchronizing time in OTN (Open Transport Network)

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Embodiment 1

[0049] The embodiment of the present invention implements a method for realizing time synchronization in an OTN network, such as figure 1 As shown, the method includes the following steps:

[0050] Step 101: The master device generates a time synchronization message, performs a first correction to the correction field of the time synchronization message, and sends a time synchronization message to the slave device, and the time synchronization message carries a first time stamp T1;

[0051] Specifically, the master device includes a first time synchronization device and a first service transmission device, wherein the first time synchronization device generates a time synchronization message, and writes the first time stamp T1 when the time synchronization message is generated into the time synchronization message. In this paper, the complement of the local counting time t1 of the time synchronization message sent by the first time synchronization device is added to the correc...

Embodiment 2

[0057] The embodiment of the present invention implements a method for realizing time synchronization in an OTN network, such as figure 2 As shown, the method includes the following steps:

[0058] Step 201: The slave device receives a time synchronization message that has been first corrected and carries a first timestamp T1, performs a second correction on the correction field of the time synchronization message, and adds a second time stamp T2;

[0059] Specifically, the slave device includes a second time synchronization device and a second service transmission device, wherein the second service transmission device receives the time synchronization message that has undergone the first correction and carries the first time stamp T1, and counts the local counting time when receiving t5 is sent to the second time synchronization device together with the time synchronization message, and the second time synchronization device determines the local counting time t6 when receivi...

Embodiment 3

[0068] The embodiment of the present invention implements a method for realizing time synchronization in an OTN network, such as image 3 As shown, the method includes the following steps:

[0069] Step 301: The master device generates a time synchronization message, performs a first correction to the correction field of the time synchronization message, and sends a time synchronization message to the slave device, and the time synchronization message carries a first time stamp T1;

[0070] Step 302: The slave device performs a second correction to the correction field of the time synchronization message, and adds a second time stamp T2;

[0071] Step 303: The slave device generates a delay request message, performs a third modification to the correction field of the delay request message, and sends the delay request message to the master device, and the delay request message carries a third timestamp T3;

[0072] Step 304: The master device makes a fourth correction to the c...

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Abstract

The invention discloses method, device and system for synchronizing time in OTN (Open Transport Network). The method comprises the steps of generating a time synchronizing message through a main device; correcting a correction domain of the time synchronizing message for the first time; sending the time synchronizing message carrying a first timestamp T1 to the device; correcting the correction domain of the time synchronizing message by the device for a second time; adding a second timestamp T2; generating a delay request message through the device; correcting the correction domain of the delay request message for the third time; sending the delay request message to the main device, wherein the delay request message carries a third timestamp T3; correcting the correction domain of the delay request message for the fourth time by the main device; adding a fourth timestamp T4; sending a delay response message carrying the fourth corrected correction domain of the delay request message and the fourth timestamp T4 to the device; synchronizing the time with the main device by the device according to the T1, T2, T3, T4, the correction domain of the time synchronizing message and the correction domain of the delay request message.

Description

technical field [0001] The present invention relates to optical transport network (OTN, Optical Transport Network) transmission technology, in particular to a method, device and system for realizing time synchronization in the OTN network. Background technique [0002] With the development of communication networks, OTN has become the mainstream of transmission networks, and the OTN network has become a platform for carrying various services. Many services have high requirements on time synchronization, and the OTN network, as the main body of services, also needs to ensure the correct transmission of time synchronization protocols. [0003] The IEEE1588 protocol can uniformly provide time synchronization and frequency synchronization, and is suitable for inter-office time-frequency transmission methods of different transmission platforms. Its core idea is to use the master-slave clock method to encode time information, and use the symmetry and delay measurement of the netwo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04L7/00
CPCH04L7/00H04J3/065H04J2203/0085H04L7/0075H04J3/0667H04J3/067H04J2203/0089
Inventor 陈宗正
Owner SANECHIPS TECH CO LTD
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