Fast Retrain Selection for Link Stability
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Solution Overview
Problem
Existing communication networks face challenges in quickly reestablishing links after electromagnetic interference, as not all devices support the same fast retrain techniques, leading to delays and potential continuous link drops.
Innovation Solution
A method for selecting a fast retrain technique involves performing link training, executing a first fast retrain technique, and upon failure, executing a second technique that does not include the failed step or modifies it to increase chances of success, with a counter-based threshold to determine when to switch techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a fast retrain technique is executed to quickly reestablish the link, then the reestablishment speed is improved, but the link may continuously drop if the technique is not supported by the link partner
Solution Approach 1:
The patent applies preliminary action by executing a test fast retrain technique before actual data transmission to verify link partner compatibility. The PHY device performs link training and then attempts a fast retrain technique in advance to detect whether the link partner supports it, storing the result for future use. This prevents continuous link drops by ensuring compatibility before relying on fast retrain.
Solution Approach 2:
The patent uses feedback mechanisms where the PHY device monitors the outcome of fast retrain technique execution. When a fast retrain technique is attempted, the device receives feedback from the link partner (success or failure indicators) and adjusts its behavior accordingly. If the technique fails, the device stops using it and falls back to full link training, preventing continuous failures.
2Adaptability or versatility
If different fast retrain techniques are used by different vendors, then device compatibility is improved, but the complexity of selecting the correct technique increases
Solution Approach 1:
The patent applies parameter changes by using different signature indicators to identify various fast retrain techniques. The PHY device and link partner exchange capability information during link training, where each device indicates which fast retrain techniques it supports through specific parameters or capability fields. This allows automatic selection of compatible techniques without complex manual configuration.
3Reliability
If a full link training is performed to establish the link, then the link establishment reliability is improved, but the time required for initial setup increases
Solution Approach 1:
The patent applies segmentation by dividing the link establishment process into two phases: initial full link training for reliable setup, and subsequent fast retrain techniques for quick recovery. The full link training is performed once during initialization to ensure proper configuration and compatibility. After successful establishment, the system segments the recovery process from the initial setup, allowing faster retrain techniques to be used for link recovery without repeating the entire training sequence.
Data Source
AI summary
A link between a PHY device and a link partner is established by performing link training. If the link becomes at least partially inoperable, a first fast retrain technique is executed. A signature indicating that the first fast retrain technique successfully began but failed during execution before completion of the first fast retrain technique is received at the PHY device. In response to receiving the signature, a second fast retrain technique is executed.