Ethernet PHY Coding Scheme for Incremental Bandwidth Expansion
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Solution Overview
Problem
The rapid increases in Ethernet transmission rates come with significant implementation costs, such as system complexity, physical plant upgrades, and increased energy consumption, which can be unjustified for applications that do not fully utilize the higher bandwidth, necessitating a solution to extend transmission capacity without transitioning to the next standardized rate.
Innovation Solution
The solution involves reusing existing Ethernet device architectures and building blocks by increasing the clocking rate, enhancing coding efficiency, and reallocating parity and error-correction bits to incrementally increase transmission capacity, thereby avoiding the high costs associated with upgrading to next-generation devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission rate is increased to next standardized level (40 Gbit/s or 100 Gbit/s), then bandwidth capacity is improved, but implementation costs including system complexity, physical plant upgrades, and energy consumption increase significantly
Solution Approach 1:
The patent applies partial action by implementing a fractional NRZ encoding scheme that transmits more data bits than traditionally allocated for a given rate. Specifically, the system transmits 512 data bits plus 1723 coded bits in a frame structure, effectively achieving higher throughput without fully transitioning to the next standardized transmission rate. This partial implementation of higher-rate capabilities allows the system to gain bandwidth capacity while avoiding the complete system overhaul required by full next-generation standards.
Solution Approach 2:
The patent changes the encoding parameters by implementing a modified NRZ (Non-Return-to-Zero) code with altered bit allocation and framing structure. The system uses a (1723, 512) fractional encoding scheme where 512 data bits are encoded into 1723 transmitted bits, changing the traditional encoding ratios. This parameter modification enables higher effective data rates using existing physical layer infrastructure, thereby improving bandwidth capacity without proportionally increasing system complexity.
2Productivity
If transmission rate is increased to next standardized level (40 Gbit/s or 100 Gbit/s), then bandwidth capacity is improved, but physical plant improvements and infrastructure upgrades are required
Solution Approach 1:
The patent achieves multi-functionality by designing an encoding scheme that operates within existing physical layer constraints while delivering enhanced bandwidth capacity. The fractional NRZ encoding system can function with current cabling infrastructure and physical plant components, making the existing infrastructure multi-functional - it supports both traditional rates and the enhanced rates achieved through encoding optimization. This universality eliminates the need for costly physical plant upgrades typically required for next-generation standards.
Solution Approach 2:
The patent uses a coding-based approach that essentially creates a logical copy or virtual enhancement of the physical layer capabilities. Rather than physically upgrading to 40 Gbit/s or 100 Gbit/s infrastructure, the system implements a coded version that achieves higher effective throughput through intelligent bit allocation and framing. This copying strategy allows the system to emulate next-generation performance characteristics using current hardware resources.
3Productivity
If transmission rate is increased to next standardized level (40 Gbit/s or 100 Gbit/s), then bandwidth capacity is improved, but energy consumption increases
Solution Approach 1:
The patent applies partial action by implementing enhanced encoding efficiency rather than full-rate escalation. The system achieves higher bandwidth capacity through optimized framing and bit allocation (512 data bits in 1723 coded bits) without activating the full power consumption modes associated with next-generation 40 Gbit/s or 100 Gbit/s physical layer implementations. This partial implementation strategy delivers improved throughput while keeping energy consumption within current operational parameters.
4Productivity
If full benefits of increased transmission rate are realized, then bandwidth capacity is improved, but implementation costs dominate when full benefits are not utilized
Solution Approach 1:
The patent changes the encoding parameters to achieve a more favorable cost-benefit ratio. By implementing a fractional encoding scheme with 512 data bits encoded into 1723 transmitted bits, the system optimizes the utilization of available bandwidth without requiring the full complexity of next-generation standards. This parameter optimization ensures that applications can achieve meaningful bandwidth improvements without incurring the complete implementation costs associated with 40 Gbit/s or 100 Gbit/s transitions, thereby aligning implementation costs with actual utilization benefits.
Data Source
AI summary
A system and method for achieving higher data rates in physical layer devices. Costs imposed by large data rate increases represented by generational increases in Ethernet standards activities are avoided through physical layer device modifications that enable marginal increases in data bandwidth. Building-block reuse can be promoted through the selective use of clocking rate increase, increase in coding efficiency, and bit reuse.