Fast Link Recovery via Dynamic Pre-coder Adjustment
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Solution Overview
Problem
High-speed Ethernet networks face link failures due to insufficient immunity to electromagnetic interference (EMI), which can cause signal degradation and noise, leading to data transmission failures, especially in higher frequency systems where EMI suppression is challenging and often occurs unpredictably.
Innovation Solution
Implement a method for fast link recovery by sensing link quality failures, selecting and communicating new pre-coder settings from the receiver to the transmitter, and computing equalizer settings to mitigate interference, specifically addressing narrowband interference through pole selection and adaptive filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If Ethernet systems operate at higher frequencies to increase data rates, then network performance is improved, but susceptibility to electromagnetic interference increases causing link failures
Solution Approach 1:
The system dynamically changes signal parameters including frequency, amplitude, and phase by adjusting pre-coder and equalizer settings to adapt to varying EMI conditions and maintain reliable communication at higher data rates
Solution Approach 2:
The system transitions from static to dynamic operation by continuously monitoring link quality and adapting pre-coder/equalizer settings in real-time, enabling the Ethernet system to maintain performance despite frequency-dependent EMI susceptibility
2Reliability
If traditional EMI protection methods are used, then some interference immunity is provided, but link recovery time is excessive when failures occur
Solution Approach 1:
The system performs preliminary actions by pre-computing and storing multiple pre-coder settings that can be rapidly applied when link failure is detected, eliminating the need for time-consuming re-training sequences and enabling fast link recovery
Solution Approach 2:
The system implements feedback by continuously monitoring link quality metrics and using this information to dynamically adjust pre-coder and equalizer settings, enabling rapid detection and correction of EMI-induced link failures
3Productivity
If pre-coder settings are dynamically adjusted to compensate for interference, then link recovery speed is improved, but system complexity increases
Solution Approach 1:
The system manages complexity by systematically varying specific signal parameters (pre-coder settings) according to pre-determined strategies rather than requiring complex real-time optimization algorithms, enabling fast link recovery with controlled system complexity
Data Source
AI summary
Embodiments of methods and apparatus for fast link recover are disclosed. One method includes sensing a link quality failure of a link between a receiver and a transmitter. If a link quality failure is sensed, then the receiver selects new pre-coder settings for the transmitter. The receiver communicates the new pre-coder settings to the transmitter. The transmitter applies the new pre-coder settings. The receiver computes its equalizer settings based on the new pre-coder settings of the transmitter. One apparatus or transceiver includes a means for determining a link quality failure of a link between the transceiver and a link partner transceiver. The transceiver selects new pre-coder settings for the link partner transceiver if a link quality failure is sensed. Additionally, the transceiver communicates the new pre-coder settings to the link partner transceiver, and computes its equalizer settings based on the new pre-coder settings of the link partner transceiver.