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Optical transmission system

A technology of optical transmission and optical transport network, which is applied in the field of optical transmission system, can solve the problems of increasing system hardware cost and maintenance cost, increasing network delay, etc., so as to reduce procurement cost and network maintenance cost, reduce network delay, The effect of reducing network maintenance costs

Pending Publication Date: 2018-11-02
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] figure 2 The described method for realizing the VC cross-connect function on the OTN optical transmission system has obvious defects: STM-M (M=16) format is connected, but between the OTN client side unit 402, the OTN line side unit 403 and the space division cross unit 201, ODU (Optical Channel Data Unit, Optical Channel Data Unit) k (k=0, 1,2,3,4) format for connection
This increases the hardware cost and maintenance cost of the system, and also increases the network delay

Method used

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Experimental program
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Embodiment 1

[0023] refer to image 3 Shown is a schematic structural diagram of the optical transmission system according to the first embodiment of the present invention. The optical transmission system described in this embodiment can implement the VC cross function on the OTN optical transmission system. The structure of the optical transmission system described in this embodiment is specifically as follows image 3 As shown, it includes a WDM processing unit 501, an OTN line side unit 103, an OTN client side unit 102 and an SDH client side unit 101;

[0024] The optical transmission system of this embodiment also includes a centralized cross-connect unit 401. In this embodiment, the centralized cross-connect unit 401 includes: ODUk (k=0, 1, 2, 3, 4) time division cross-connect unit 301, VC cross-connect unit 201 , STM-M (M=16) frame format data to ODUk (k=0, 1, 2, 3, 4) frame format data mapping and demapping unit 202 .

[0025] Wherein, the WDM processing unit 501 completes multip...

Embodiment 2

[0035] The second embodiment of implementing the VC crossover function on the OTN optical transmission system described in the present invention is as follows Figure 4 shown. it and image 3 The difference between the embodiments is that: the OTN cross function unit is a cell (CELL) switching unit 301 . The cell switching unit 301 is an OTN cross function unit based on cell switching technology. This unit is connected with the OTN client side unit 102 , SDH client side unit 101 , OTN line side unit 103 and VC crossover unit 201 through cell interfaces. Therefore, between the cell switching unit 301 and other units, a cell conversion unit 601 for ODUk (k=0, 1, 2, 3, 4) frame format data to cells is added. The cell conversion unit 601 completes the conversion function between continuous rate ODUk (k=0, 1, 2, 3, 4) frame format data and cells. In addition, other functional modules and image 3 The embodiments are exactly the same, and will not be repeated here.

Embodiment 3

[0037] exist Figure 4 On the basis of the embodiment, if the cell switching unit and the VC crossing unit in the centralized crossing unit are combined into a unified cell switching platform, then the third method of realizing the VC crossing function on the OTN optical transmission system described in the present invention Example Figure 5 shown. In this embodiment, the unified cell crossover platform can not only complete cell switching based on ODUk (k=0, 1, 2, 3, 4), but also complete cell switching based on VC. The client-side access unit 101 first maps and demaps STM-N (N=1, 4, 16, 64) services of each rate level on the client side to VCs of different rate levels (VC-4 or VC-3 or VC-12 ) particles, and then encapsulate and decapsulate the VC (VC-4 or VC-3 or VC-12) particles into the CELL cell format, and then switch to the line side unit through a unified cell switching platform. The structure of the line side unit and Figure 4 The embodiments are exactly the sam...

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Abstract

The invention relates to an optical transmission system. The optical transmission system comprises a wave division multiplex (WDM) processing unit, an optical transport network (OTN) line side unit, an OTN client side unit, a synchronous digital hierarchy (SDH) client side unit, and a centralized cross unit, wherein the centralized cross unit comprises a virtual container (VC) cross unit and an OTN cross functional unit, the OTN cross functional unit is an optical channel data unit (ODUk) time division cross unit or a cell switch unit, the ODUk time division cross unit realizes a time divisioncross function based on ODUk frame format data, the cell switch unit realizes an OTN cross function based on a cell switch technology, if the OTN cross functional unit is an ODUk time division crossunit, the OTN line side unit, the OTN client side unit and the SDH client side unit are connected with the ODUk time division cross unit separately by using interfaces of an ODUk format.

Description

technical field [0001] The invention relates to the technical field of optical transmission and communication, in particular to an optical transmission system. Background technique [0002] In the original optical transmission network system, the OTN (Optical Transport Network, Optical Transport Network) system and the SDH (Synchronous Digital Hierarchy, Synchronous Digital Hierarchy) system are two independent transmission networks. The OTN optical transmission network is responsible for OTU (Optical Channel Transport Unit, optical channel transmission unit) k (k = 1, 2, 3, 4) access, convergence, transmission and cross-scheduling work, and the SDH optical transmission network is responsible for STM (Synchronous Transmission Complexity) Use)-N (N=1, 4, 16, 64) access, aggregation, transmission and cross-scheduling work. The cross-connect scheduling modules of the two networks are independent of each other and are not related to each other, and are implemented in OTN equipm...

Claims

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Application Information

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IPC IPC(8): H04B10/27H04J3/16H04Q11/00
CPCH04B10/27H04J3/1652H04Q11/0062H04Q11/0071H04Q2011/0079
Inventor 柴岩
Owner ZTE CORP