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Method and system for reducing downlink forward error correction process of kilomega passive optical network

A passive optical network and processing module technology, which is applied in the direction of transmission system, digital transmission system, multiplexing system selection device, etc., to achieve the effect of reducing complexity, reducing cost, and reducing requirements

Inactive Publication Date: 2009-11-04
HUAWEI TECH CO LTD
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Problems solved by technology

[0007] The present invention provides a method and system for simplifying the downlink forward error correction processing of Gigabit passive optical network, so as to solve the problem in the prior art that it is necessary to increase the processing performance of the FEC module or increase the processing performance of a single FEC processing module to improve the system processing performance

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  • Method and system for reducing downlink forward error correction process of kilomega passive optical network
  • Method and system for reducing downlink forward error correction process of kilomega passive optical network
  • Method and system for reducing downlink forward error correction process of kilomega passive optical network

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Embodiment Construction

[0022] In the following, the present invention will be further elaborated by taking GPON line rate 2.48832Gbps as an example according to specific embodiments.

[0023] Such as Figure 4 As shown, the system of the present invention includes a forward error correction FEC storage unit for storing fixed data, an FEC encoding processing module for performing FEC encoding processing on downlink data, and an FEC decoding processing module for performing FEC decoding processing on downlink data module. The storage unit is set in the FEC encoding processing module and the decoding processing module. For downlink processing, the FEC encoding processing module is generally set in the central office equipment, and the FEC decoding processing module is set in the terminal equipment.

[0024] When the GPON line rate is 2.48832Gbps, the downlink frame length is 38880 bytes. According to the algorithm: the downlink data length is 38880 divided by 255, and the remainder is 120. In the re...

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Abstract

The invention relates to a data processing technology in a passive optical network, in particular to a method and a system for performing forward error correction (FEC) processing on downlink data in a gigabit passive optical network (GPON). A method for simplifying downlink forward error correction processing of a Gigabit passive optical network, in which a specific byte in downlink data is set to a fixed value, and according to the specific byte set to a fixed value and the specific byte associated with the specific byte The FEC check corresponding to the section uses redundant bytes to form a fixed data; the forward error correction FEC processing module adds the fixed data to the end of the downlink data frame when performing FEC encoding, and adds the fixed data to the end of the downlink data frame when performing FEC decoding throw away. The present invention discards the valid data in the remainder obtained by dividing the GPON downlink frame by 255, so that the system does not need to increase the FEC processing module and its performance, and can work without changing the system clock frequency, reducing the number of OLT and ONU processing FEC. Decoding performance requirements, thereby reducing the processing complexity, simplifying the circuit, and reducing the cost of the system.

Description

[technical field] [0001] The invention relates to a data processing technology in a passive optical network, in particular to a method and a system for performing forward error correction (FEC) processing on downlink data in a gigabit passive optical network (GPON). [Background technique] [0002] Due to passive optical splitting in the downlink direction of the GPON network, the optical signal attenuation is relatively large, and the optical module received at the optical network unit (Optic Network Unit, ONU) side requires high sensitivity, resulting in an increase in system cost. The G.984 standard of GPON can optionally support a forward error correction (Forward Error Correction, FEC) function. FEC is a forward error correction code that uses RS (255, 239) encoding, that is, every 239 bytes of valid data is processed to obtain 16 bytes of redundant bytes, and 239 bytes of valid data are combined into a 255 byte data blocks for transmission. On the receiving side, acco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04Q11/00
Inventor 何军
Owner HUAWEI TECH CO LTD
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