8B/10B Video Stream Transport Over 64B/66B Link

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Solution Overview

Problem

Existing video systems face challenges in protecting video control symbols without introducing significant overhead or complexity, particularly in 64B/66B coded links, where sync bit errors are not correctable and traditional forward error correction schemes are inadequate.

Innovation Solution

The system decodes 8B/10B video streams to identify control and data bytes, maps control bytes for single-bit error correction, and packs them into 64B/66B blocks with redundant information to enable efficient error detection and correction, allowing direct transmission over 64B/66B links without standard packetization, thereby protecting video control symbols.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional forward error correction schemes are used to protect video control symbols, then video control errors are reduced, but overhead increases by 7-10% and system complexity increases

Engineering Contradiction:

Improvevideo control symbol error protectionVSAvoidFEC scheme complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by providing different levels of protection to different parts of the data stream. Specifically, video control symbols receive strong error protection through mapping to codes with distance 3 or more, while video data symbols use simpler protection mechanisms. This differentiated approach protects the critical control symbols without applying full FEC overhead to the entire stream, thereby reducing overall complexity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the video stream into control symbols and data symbols, treating them differently. Control symbols are mapped to specific codes with error correction capability, while data symbols are transmitted with simpler handling. This segmentation allows the system to provide targeted protection where needed without the uniform overhead of traditional FEC schemes.

Inventive Principle:

Principle #1Segmentation

2Reliability

If traditional forward error correction schemes are used to protect video control symbols, then video control errors are reduced, but data stream overhead increases by 7-10%

Engineering Contradiction:

Improvevideo control symbol error protectionVSAvoiddata stream overhead

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies partial action by providing error correction only where strictly necessary - for video control symbols - rather than applying full FEC to the entire data stream. This selective protection reduces the overhead burden while maintaining adequate protection for the most critical elements.

Inventive Principle:

Principle #16Partial or excessive action

3Difficulty of detecting and measuring

If prior art 64B/66B encoding is used, then sync bit errors are detected but not correctable, causing entire 66B coded words to be lost

Engineering Contradiction:

Improvesync bit error detectionVSAvoidsync bit error correction

Core Design Contradiction:

Difficulty of detecting and measuringVSReliability

Solution Approach 1:

The patent applies preliminary action by mapping video control symbols to codes with Hamming distance of 3 or more before transmission. This pre-established error correction capability allows the system to not only detect but also correct sync bit errors that occur during transmission, preventing the loss of entire 66B coded words.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies beforehand cushioning by incorporating redundant information through mapping control symbols to codes with distance 3 or more. This built-in redundancy acts as a cushion against transmission errors, enabling the system to recover from sync bit errors without requiring complex error correction protocols.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

4Adaptability or versatility

If 8B/10B video streams are packed into RTP packets and transported over network protocols, then standard network compatibility is achieved, but transmission complexity and overhead increase

Engineering Contradiction:

Improvenetwork protocol compatibilityVSAvoidpacketization and header processing

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies taking out by extracting the 8B/10B video symbols directly from the source and transmitting them over the 64B/66B link without intermediate packetization. This eliminates the need for RTP packet headers and associated processing, reducing complexity while maintaining direct network compatibility through the 64B/66B encoding layer.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS8705633B2Method and apparatus for transporting an 8B/10B coded video stream across a 64B/66B coded link

Publication Date: 2014.04.22 OMRON MANAGEMENT CENTER OF AMERICA INC

AI summary

A video transport system is provided for transporting as 8B/10B coded video stream across a 64B/66B coded link, wherein forward error correction is provided without the overhead of the prior art. The system also provides a system with the ability to recover 64B/66B Encoded blocks that have corrupt Sync bits.