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Data transmission method,optical line terminal and system

A data transmission method and data technology, applied in the field of optical communication, can solve problems such as poor self-adaptation and little room for adjustment, and achieve the effect of improving utilization

Inactive Publication Date: 2011-11-09
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The FEC encoding algorithm can only be selected between enabling and disabling, with little room for adjustment and poor self-adaptation

Method used

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  • Data transmission method,optical line terminal and system
  • Data transmission method,optical line terminal and system
  • Data transmission method,optical line terminal and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] See figure 1 , This embodiment provides a data transmission method, which is applied to a 10G Ethernet passive optical network EPON, including:

[0031] 101: Detect the quality of the link between itself and the ONU;

[0032] 102: Determine the length of the data block according to the detection result, and determine the parameters of the Reed-Solomon RS coding algorithm according to the length of the data block;

[0033] 103: According to the parameters of the RS coding algorithm, perform FEC coding on the downlink data by using the RS coding algorithm, and then send it to the ONU.

[0034] The above steps 101 to 103 can be performed by the OLT. The RS coding algorithm is selected as the FEC coding algorithm. The RS coding algorithm can usually be expressed as RS(n,k), where n represents the length of the codeword, k represents the length of the data block, and nk represents The length of the check block, in this embodiment, n=255, k is determined according to the link quality...

Embodiment 2

[0048] See image 3 , This embodiment provides a data transmission method, which is applied to a 10G Ethernet passive optical network EPON, including:

[0049] 301: The bit error rate of the link between the OLT detection and the ONU;

[0050] Generally, the OLT can be connected to multiple ONUs, and the link with each ONU may be different. Each link has its own link error rate. The link error detected by the OLT in this embodiment is The code rate refers to the link error rate of the link between the ONUs communicating with it.

[0051] 302: The OLT selects a number within a preset range according to the link error rate as the error correction number t, where the preset range is an integer from 0 to 32;

[0052] 303: OLT calculates the data block length k according to the following formula according to the number of corrected errors t obtained:

[0053] k=n-2×t;

[0054] Among them, n is the length of the codeword, and n=255, and n-k represents the length of the check block. The larger...

Embodiment 3

[0074] See Figure 4 This embodiment provides an optical line terminal OLT, which is applied to a 10G Ethernet passive optical network EPON, including:

[0075] The detection module 401 is used to detect the quality of the link with the optical network unit ONU;

[0076] The encoding module 402 is configured to determine the length of the data block according to the detection result, determine the parameters of the Reed-Solomon RS encoding algorithm according to the length of the data block, and use the RS encoding algorithm to apply the RS encoding algorithm to the downlink data according to the parameters of the RS encoding algorithm. Perform FEC forward error correction coding;

[0077] The sending module 403 is configured to send the FEC encoded downlink data to the ONU.

[0078] In this embodiment, the detection module 401 may be used to detect the bit error rate of the link with the ONU.

[0079] In this embodiment, the encoding module 402 may include:

[0080] The calculation uni...

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Abstract

The invention provides a data transmission method, OLT (optical line terminal) and system in a 10G EPON (Ethernet Passive Optical Network), belonging to the photo-communication field. The method comprises the following steps of: detecting the link circuit quality between ONUs (Optical Network Unit); determining a length of a data block according to the detection result and determining a parameter of RS (Reed-Solomon) encryption algorithm according to the length of a data block; performing FEC (Forward Error Correction) encoding to down link circuit by RS encryption algorithm and transmitting to the OUNs. The OLT comprises a detecting module, an encoding module and a transmitting module. The system comprises the OLT and OUN. The invention enables the FEC encoding to become a selectable processing process and improves the bandwidth efficiency.

Description

Technical field [0001] The present invention relates to the field of optical communication, in particular to a data transmission method, optical line terminal and system. Background technique [0002] 10G EPON (Ethernet Passive Optical Network, Ethernet passive optical network) adopts RS (Reed-Solomon, Reed-Solomon code) (255, 223) algorithm as the upstream and downstream FEC (Forward Error Correction, forward error correction) coding Algorithm, and uses a fixed FEC codeword format for uplink and downlink transmission. Due to the fixed use of RS (255, 223) for FEC encoding, the encoding efficiency of 10G EPON is only 87%. For optical fiber links, the actual available bandwidth of the 10Gbps data bandwidth is only 8.7Gbps. Although 10GEPONFEC coding can increase the optical power budget of the system, the coding gain provided by RS (255, 223) coding still cannot meet the harsh environment such as large splitting ratio, long access distance, and poor line quality. Optical power b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/08H04L1/00
CPCH04L1/0046H04L1/0057
Inventor 董恩升郑盛巍聂世玮
Owner HUAWEI TECH CO LTD
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