SerDes Hidden Backchannel for Equalization Data
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Solution Overview
Problem
As data rates increase, existing Ethernet standards face challenges with channel attenuation and dispersion, leading to limitations in data throughput, particularly in high-speed LAN operations, where enhanced equalization techniques may impact user bandwidth.
Innovation Solution
A serializer-deserializer (SerDes) architecture that implements a hidden backchannel to communicate equalization information without affecting user bandwidth, using a transceiver with multiple receivers, adaptation modules, alignment marker detection, and backchannel field replacement to modify data streams and transmit equalization filter coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If enhanced equalization techniques are employed to combat channel attenuation and dispersion at higher data rates, then signal quality is improved, but user bandwidth is reduced
Solution Approach 1:
The patent introduces a hidden backchannel as an intermediary communication path that carries equalization information separately from the main data channels. This mediator allows equalization data to be transmitted without competing with user data for bandwidth resources, thus maintaining both signal quality and user bandwidth simultaneously
Solution Approach 2:
The patent adds a new dimension to the communication system by utilizing the backchannel field within existing data structures (such as alignment markers) to carry equalization information. This dimensional addition allows simultaneous transmission of user data and equalization data without interfering with each other's bandwidth allocation
2Device complexity
If equalization information is transmitted through existing data channels, then communication overhead is reduced, but user bandwidth is impinged upon
Solution Approach 1:
The hidden backchannel serves as a dedicated intermediary pathway for equalization information, separating it from user data channels. This approach maintains low communication overhead while preserving user bandwidth by using otherwise underutilized backchannel resources
3Measurement precision
If more bandwidth is allocated to equalization communication, then equalization accuracy is improved, but data throughput is reduced
Solution Approach 1:
The backchannel acts as a mediator that provides dedicated bandwidth for equalization communication without encroaching on user data throughput. By using this separate communication path, the system can allocate sufficient resources for accurate equalization while maintaining high data throughput in the forward channels
Data Source
AI summary
An illustrative multi-lane communication method implements a hidden backchannel to communicate equalization information and/or other link-related data without impinging on the user bandwidth allocated by the relevant articles of IEEE Std 802.3. One embodiment is implemented by a transceiver: (a) receiving signals from different receive channels; (b) converting each receive channel signal into a lane of a multi-lane receive data stream via demodulation and error measurement; (c) deriving outgoing backchannel information based at least in part on the error measurement; (d) detecting alignment markers in each lane of the multi-lane receive data stream; (e) extracting incoming backchannel information from a backchannel field following each alignment marker in at least one lane of the multi-lane receive data stream; and (f) modifying the multi-lane receive data stream to obtain a modified multi-lane receive data stream by replacing backchannel fields with PCS (Physical Coding Sublayer) alignment markers, thereby creating sets of grouped PCS alignment markers in said at least one lane.