Method, device and system for transmitting 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 achieve fs synchronization, unable to transmit synchronized clocks at the same time, and achieve the effect of high-quality transmission

Active Publication Date: 2012-04-04
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 transmitting synchronous clock
  • Method, device and system for transmitting synchronous clock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 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:

[0060] 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;

[0061] S202: Generate a synchronous timing signal inside the OLT according to the selected synchronous clock;

[0062] 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;

[0063] S204: Calculate the rate difference between the two E1 services and the synchronous timi...

Embodiment 2

[0079] 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:

[0080] S301-S303: same as steps S201-S203;

[0081] 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;

[0082] Wherein, the process of GEM encapsul...

Embodiment 3

[0090] 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.

[0091] 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 system for transmitting a synchronous clock, relates to the technical field of optical communication, and is invented to solve the problem that a GPON network cannot transmit the synchronous clock in the prior art. The method for transmitting the synchronous clock comprises that: an optical line terminal determines a preferable synchronous clock; theoptical line terminal generates a GPON physical clock by taking the preferable synchronous clock as reference; an optical network unit acquires the physical clock through the GPON; and the optical network unit generates a clock synchronous with the preferable synchronous clock by taking the physical clock as reference. The method, the device and the system are suitable for transmitting the synchronous clock in the GPON network.

Description

technical field [0001] 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 [0002] 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 Distribution Network) at the user site. [0003] At present, in the GPON network, a TDM (Time Division Multiplex, time division multiplexing) circuit emulation mode is mainly used to transmit the TDM service data flow, and the TDM serv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00H04J3/06
CPCH04Q2011/0079H04Q11/0067H04J3/0652
Inventor 李昆周建林邹世敏
Owner HUAWEI TECH CO LTD
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