OLT Equalization Parameter Pre-setting via ONU Identifier
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Solution Overview
Problem
In passive optical networks (PONs), the Optical Line Terminal (OLT) experiences delays due to the need for iterative convergence to determine reference equalization parameters for optical signals from different Optical Network Units (ONUs), which are affected by varying passive devices and distances, leading to prolonged signal equalization processing times.
Innovation Solution
A board and optical module configuration that includes a MAC chip and DSP, where the MAC chip sends an ONU identifier to the DSP at the ONU online stage, allowing the DSP to determine and set a reference equalization parameter for the equalizer without iterative convergence, thereby reducing delay by pre-setting the equalization parameter before the upstream transmission time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If iterative convergence is used to determine reference equalization parameters for each ONU, then the equalization parameter can be accurately determined, but the signal equalization processing time is prolonged
Solution Approach 1:
The patent applies preliminary action by pre-determining reference equalization parameters during the ONU online stage (registration phase) before actual upstream transmission begins. The MAC chip sends the ONU identifier to the DSP, which determines the reference equalization parameter in advance and sets it in the equalizer. This eliminates the need for iterative convergence during actual signal processing, resolving the contradiction between parameter accuracy and processing time by performing the determination action beforehand.
2Adaptability or versatility
If iterative convergence is performed for each ONU, then the equalization parameter adapts to specific ONU characteristics, but the convergence process causes delay
Solution Approach 1:
The patent performs the adaptation action in advance during the ONU online stage. The DSP determines the reference equalization parameter based on the ONU identifier before upstream transmission starts, allowing the equalizer to be pre-adapted to each ONU's specific characteristics (passive devices and distances). This eliminates convergence delay during actual operation while maintaining adaptability to individual ONU characteristics.
Data Source
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AI summary
Embodiments of this application disclose a board, an optical module, a MAC chip, a DSP, and an information processing method. The board in the embodiments of this application includes a media access control MAC chip, a digital signal processor DSP, and an equalizer. The MAC chip is configured to send first information to the DSP at an ONU online stage, where the first information includes a first ONU identifier. The DSP is configured to receive the first information, and determine a first reference equalization parameter, where the first reference equalization parameter is related to the first ONU identifier. The DSP is further configured to set an equalization parameter of the equalizer to the first reference equalization parameter.