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Method, device and system for transferring synchronous clock

A technology for synchronizing clocks and clocks, applied in the field of optical communication, can solve the problems of large fd jitter and drift, unable to transmit synchronous clocks at the same time, unable to transmit synchronous clocks, etc., and achieve the effect of high-quality transmission

Inactive Publication Date: 2010-01-20
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the second clock fd has a great relationship with the amount of data in the cache. A large change in the amount of data in the cache will cause a large change in fd, resulting in a large jitter and drift in fd, which cannot be achieved with the second clock. One clock fs sync
Therefore, when transmitting the service data stream output by the ONU after TDM circuit simulation processing, the synchronous clock cannot be transmitted at the same time
That is to say, the traditional GPON network cannot transmit synchronous clock

Method used

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  • Method, device and system for transferring synchronous clock
  • Method, device and system for transferring synchronous clock

Examples

Experimental program
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Effect test

Embodiment 1

[0050] In this embodiment, two channels of E1 services are transmitted at the same time, and the two channels of E1 services respectively carry different synchronous clocks when output by the ONU. Such as figure 2 As shown, the specific implementation process of this embodiment is as follows:

[0051] S201: The synchronous clock input module of the OLT selects BITS or the input of a certain E1 as the synchronous clock source according to the synchronous clock quality information or according to the user setting, and sends it to the synchronous clock processing module;

[0052] S202: Generate a synchronous timing signal inside the OLT according to the selected synchronous clock;

[0053] S203: According to the selected synchronous clock, generate 8KHz and 155.52MHz GPON physical clocks synchronous with the synchronous clock, and send them to the GTC processing module of the OLT;

[0054] S204: Calculate the rate difference between the two E1 services and the synchronous timing...

Embodiment 2

[0070] In this embodiment, two channels of E1 services are transmitted at the same time, and the two channels of E1 services respectively carry different synchronous clocks when output by the ONU. Different from Embodiment 1, this embodiment directly encapsulates and decapsulates the original input rate of E1, without calculating the rate difference between E1 and the synchronous timing signal. Such as image 3 As shown, the specific implementation process of this embodiment is as follows:

[0071] S301-S303: same as steps S201-S203;

[0072] S304: Send the original input rate of the E1 and the synchronous clock quality information together to the GEM encapsulation module, and the GEM encapsulation module encapsulates the original input rate of the E1, the synchronous clock quality information and the E1 service data flow into a GEM frame, transmitted to the ONU, wherein the synchronization clock quality information is optional;

[0073] Wherein, the process of GEM encapsul...

Embodiment 3

[0081] In this embodiment, the GPON network transmits two E1 services at the same time, and the two E1 services carry the same synchronous clock when output by the ONU. The specific implementation process of this embodiment is the same as the implementation process described in Embodiment 1, and will not be repeated here. Wherein, the rate difference between the two E1 services and the synchronous timing signal in the step S204 is always zero.

[0082] Of course, this embodiment can also be similar to Embodiment 2, and directly encapsulate and decapsulate the original input rate of E1 without calculating the rate difference between E1 and the synchronous timing signal. For the specific implementation process, refer to Embodiment 1 and Implementation Example 2 will not be repeated here.

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Abstract

The invention discloses a method, a device and a system for transferring a synchronous clock, and relates to the technical field of optical communication to solve the problem that a GPON network cannot transfer the synchronous clock in the prior art. The method for transferring the synchronous clock, which is provided by the embodiment of the invention, comprises the following steps that: determining an optimal synchronous clock by an optical line terminal; taking the optimal synchronous clock as reference to generate a GPON physical clock by the optical line terminal; acquiring the physical clock through the GPON by an optical network unit; and taking the physical clock as reference to generate a clock which is synchronous with the optimal synchronous clock by the optical network unit. The method, the device and the system are suitable for transferring the synchronous clock in the GPON network.

Description

[0001] This application is a divisional application of the application with the application number 200810132786.7 and the invention title "Transfer Method, Device and System for Synchronized Clock" submitted on July 14, 2008. technical field [0002] The present invention relates to the technical field of optical communication, in particular to a transfer method, device and system of a synchronous clock. Background technique [0003] GPON (Gigabit-Capable Passive Optical Network, Gigabit-Capable Passive Optical Network) technology is an important technical branch in the PON (Passive Optical Network, Passive Optical Network) family. Similar to other PON technologies, GPON is also a passive optical access technology using a point-to-multipoint topology, including an OLT (Optical Line Terminals, Optical Line Terminals) installed in the central control It is composed of an ONU (Optical Network Unit, Optical Network Unit) and an ODN (Optical Distribution Network, Optical Distribu...

Claims

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Application Information

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IPC IPC(8): H04J3/06H04J3/16H04Q11/00
Inventor 李昆周建林邹世敏
Owner HUAWEI TECH CO LTD
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