Alien Crosstalk Cancellation in Multiport Ethernet Transceivers
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Solution Overview
Problem
10GBASE-T communication systems face significant performance degradation due to alien crosstalk interference from adjacent Ethernet ports or cables, which is challenging to mitigate as the source is unknown and external to the link.
Innovation Solution
The implementation of adaptive filtering and cancellation circuitry in transceivers, allowing for the sharing of crosstalk information between adjacent Physical Layer (PHY) circuits to cancel far-end and near-end alien crosstalk, using filter circuits and cancellers to reduce interference across channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adaptive filtering and cancellation circuitry is implemented to cancel alien crosstalk, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
The alien crosstalk cancellation function is segmented into separate PHY circuits that can be independently implemented and configured. Each PHY circuit processes signals for specific channels, allowing the complex cancellation function to be divided into manageable modular units that can be selectively activated based on deployment needs.
Solution Approach 2:
Filter circuits are introduced as intermediary components between the receiver and the signal processing logic. These filters act as mediators that preprocess the received signal by attenuating alien crosstalk components before the main cancellation algorithms operate, reducing the computational burden on the primary signal processing path.
2Reliability
If crosstalk information is shared between adjacent PHY circuits, then alien crosstalk cancellation effectiveness is improved, but communication protocol complexity increases
Solution Approach 1:
The PHY circuit interface is designed with universal multi-functionality to handle both normal data communication and crosstalk information exchange through the same communication infrastructure. The existing Ethernet protocol framework is extended to carry additional cancellation metadata without requiring separate dedicated communication channels or protocols.
Solution Approach 2:
Adjacent PHY circuits autonomously process and utilize shared crosstalk information without requiring centralized coordination or complex inter-protocol handshaking. Each PHY circuit independently extracts relevant crosstalk characteristics from shared data and applies local cancellation processing, eliminating the need for sophisticated cooperative protocols.
Data Source
AI summary
A transceiver system is disclosed. The transceiver system comprises a first transceiver physical layer circuit (PHY) having a first plurality of channels and a second transceiver PHY disposed adjacent the first transceiver PHY and having a second plurality of channels. Far end crosstalk filter circuitry is coupled between at least one of the plurality of first channels and at least one of the plurality of second channels.