Distance-Proof N-Pass Auto Negotiation for Gigabit Ethernet
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Solution Overview
Problem
Conventional Auto Negotiation mechanisms fail to effectively negotiate links over extended distances in Ethernet systems due to latency issues in optical networks, leading to delayed or failed link establishment.
Innovation Solution
Implementing a distance-proof N-pass Auto Negotiation system that determines latency between nodes and restarts Auto Negotiation up to a variable number of times (n) to ensure successful link establishment, using mechanisms such as latency measurement algorithms and IDLE_DETECT states to account for extended distances and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Auto Negotiation mechanisms are used over extended distances in optical networks, then the negotiation process is simple and standards-compliant, but latency causes delayed or failed link establishment
Solution Approach 1:
The patent applies preliminary action by having each endpoint transmit its ability set before receiving the remote endpoint's ability set. This allows each device to prepare and send its capabilities in advance, ensuring that when the remote device responds, both sides have already processed the necessary information to make informed negotiation decisions, thereby resolving latency-induced failures
Solution Approach 2:
The patent implements feedback mechanisms where each endpoint waits for confirmation that the remote endpoint has received and processed its ability set before proceeding to the next negotiation phase. This feedback loop ensures that both sides are synchronized despite network latency, preventing premature link establishment failures
2Reliability
If Auto Negotiation is implemented without distance-proof mechanisms, then the device complexity is low, but negotiation failures occur over extended distances
Solution Approach 1:
The patent segments the Auto Negotiation process into distinct phases: ability set transmission, ability set reception and processing, and link establishment confirmation. Each phase has specific requirements and timing constraints that must be satisfied in sequence. This segmentation makes the complex negotiation process manageable and ensures that latency issues are addressed at each stage without overwhelming the entire system
3Productivity
If standard Auto Negotiation timing is used, then the negotiation process is efficient for short distances, but it fails to account for optical network latency
Solution Approach 1:
The patent introduces dynamic timing adjustments where the negotiation process adapts to the specific latency conditions of the optical network. Instead of using fixed timing values, the system dynamically waits for confirmation that the remote endpoint has received and processed ability sets before proceeding. This dynamic approach maintains negotiation efficiency while ensuring reliability over extended distances
Data Source
AI summary
The present invention provides distance-proof N-pass Auto Negotiation systems and methods for Gigabit Ethernet. The present invention distance proofs Auto Negotiation. No matter the distance between two nodes configured according to the systems and methods of the present invention, the link at either end of the two nodes will only come up once each end has negotiated, resolved its link partner's capabilities, and received a similar success signal from the remote node.