Multi-Lane Cable Communication With FEC for Cross Talk Control

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Solution Overview

Problem

Existing cable interconnection techniques face challenges in maintaining acceptable bit error rates at evolving data transmission speeds, particularly with cross talk issues in multi-cable configurations, which affect performance as data speeds increase.

Innovation Solution

The implementation of PHY stacks capable of signal processing at various speeds, including 40 Gb/s and 100 Gb/s, using forward error correction (FEC) sublayers and auto-negotiation, along with modified FEC encoding and decoding techniques, to manage signal transmission over multiple lanes and ensure compatibility with emerging IEEE 802.3ba standards.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple cables are used to increase data transmission speed, then productivity is improved, but cross talk increases causing bit error rates to worsen

Engineering Contradiction:

Improvedata transmission speedVSAvoidbit error rate

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A cable assembly with integrated shielding structures acts as an intermediary between multiple cables, reducing cross talk through Faraday shields and bonding structures that manage electromagnetic interference while maintaining high-speed data transmission capability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The cable assembly uses composite construction combining multiple conductors, shielding materials, and bonding structures to simultaneously achieve high transmission speed and low cross talk, integrating multiple functions into a unified assembly

Inventive Principle:

Principle #40Composite materials

2Productivity

If data transmission speed is increased to 40 Gb/s and 100 Gb/s, then productivity is improved, but signal integrity deteriorates due to cross talk

Engineering Contradiction:

Improvedata transmission speedVSAvoidcross talk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

Faraday shields and bonding structures serve as intermediary elements between adjacent conductors, blocking electromagnetic interference and reducing cross talk effects at high transmission speeds of 40 Gb/s and 100 Gb/s

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The cable assembly modifies physical parameters such as shielding configuration, conductor spacing, and bonding structure geometry to optimize signal integrity at evolving data transmission speeds

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If cable interconnection techniques are updated for high speeds, then adaptability is improved, but device complexity increases

Engineering Contradiction:

Improvecompatibility with emerging standardsVSAvoidcable assembly structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The cable assembly design incorporates universal features that support multiple data transmission speeds and emerging IEEE standards while maintaining a unified structural approach that manages complexity through standardized multi-functional components

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8661313B2Device communication techniques

Publication Date: 2014.02.25 INTEL CORP

AI summary

Techniques are described that can extend the transmission rate over cable. Multiple cables can be used to increase the transmission rate. The transmission standard applied for each cable can be an Ethernet backplane standard such as IEEE 802.3ap (2007). Data can be assigned to virtual lanes prior to transmission over a cable. Forward error correction may be applied to each virtual lane prior to transmission over cable. Forward error correction may be negotiated over a single virtual lane and then applied to all virtual lanes.