Gigabit Ethernet FEC Coding with 64b66b for Payload Efficiency
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Solution Overview
Problem
Current colorless laser systems for WDM PON face challenges in performance and cost due to the need for high injection power and well-designed optical components, and existing FEC schemes in PON systems result in substantial payload rate drops and inefficiencies, especially for smaller Ethernet packets.
Innovation Solution
The implementation of a data sending/receiving method and component for Gigabit Ethernet with improved FEC capabilities, using 64b66b encoding and Reed-Solomon FEC, which is compatible with legacy GE devices and interfaces, allowing for extended transmission distance without increasing data rate or sacrificing payload, and incorporating a new FEC/PCS layer that reduces redundancy and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing FEC schemes are used in PON systems, then error correction capability is provided, but payload rate drops substantially and efficiency decreases
Solution Approach 1:
The patent changes the FEC coding parameters from traditional schemes to Reed-Solomon (255,239) coding with a code rate of 239/255≈0.937, which provides error correction while maintaining higher payload rates. The 64b66b line coding is also optimized to reduce overhead from 25% (8b10b) to approximately 3.1%, significantly improving payload efficiency while maintaining forward error correction capability.
Solution Approach 2:
The patent segments the data transmission process into distinct coding layers: 64b66b line coding for basic framing and synchronization, followed by Reed-Solomon FEC coding for error correction. This layered approach allows each segment to perform its specific function efficiently, with the FEC layer correcting errors without requiring substantial payload rate sacrifice.
2Reliability
If colorless laser systems use high injection power and well-designed optical components, then transmission performance is improved, but system cost increases
Solution Approach 1:
The patent replaces expensive, precisely-designed colorless laser systems with standard, off-the-shelf lasers that have lower injection power requirements. By implementing enhanced FEC (64b66b line coding plus Reed-Solomon coding) and optimized transmission protocols, the system compensates for the lower quality of inexpensive components, achieving comparable transmission performance without the high cost of specialized lasers and optical components.
Data Source
AI summary
A method for sending data from a transmitter to a receiver in a transmission network comprising receiving outgoing data that is eight-bits-ten-bits (8b10b) encoded at a Gigabit Ethernet (GE) line rate from a physical medium attachment (PMA) layer, 8b10b decoding the received outgoing data, 64-bits-to-66-bits (64b66b) encoding the 8b10b decoded outgoing data, forward error correction (FEC) encoding the 64b66b encoded outgoing data, and serializing and sending the 64b66b and FEC encoded outgoing data at the GE line rate to a physical medium dependent (PMD) layer.