Ethernet Gearbox Virtual Lane Alignment
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Solution Overview
Problem
In 100 GbE networks, bit multiplexing leads to loss of knowledge about traffic flow paths due to misbehavior of intermediary lanes, making network management difficult and costly due to the scrambling of virtual lane associations with physical lanes.
Innovation Solution
The introduction of virtual lane identifiers that create a wiring diagram, allowing for alignment of virtual lanes with physical lanes through an auxiliary light PCS element, enabling effective tracing and management of data flows by matching identifiers in both multiplexing and de-multiplexing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bit multiplexing is used to increase bandwidth, then data transmission capacity is improved, but loss of knowledge about traffic flow paths occurs
Solution Approach 1:
The patent introduces virtual lane identifiers as intermediary elements that carry information about data flow paths through the multiplexing system. These identifiers act as mediators between the physical lanes and the multiplexed data streams, allowing the system to maintain awareness of traffic flow paths despite bit multiplexing operations.
Solution Approach 2:
The patent implements feedback mechanisms where the system uses identified virtual lane identifiers to realign data flows. This feedback loop allows the system to detect misalignment caused by multiplexing and corrective actions to restore proper lane associations, thereby maintaining traffic flow path knowledge.
2Difficulty of detecting and measuring
If virtual lane identifiers are introduced for alignment, then data flow tracing capability is improved, but device complexity increases
Solution Approach 1:
The patent makes the auxiliary light PCS element perform multiple functions: it serves as both a physical layer component and a virtual lane identifier carrier. This multi-functionality reduces the need for separate dedicated alignment hardware, thereby limiting the increase in device complexity while maintaining data flow tracing capability.
Solution Approach 2:
The patent combines the virtual lane identifier functionality with the existing physical layer signaling mechanisms. By merging the identification function into the existing infrastructure rather than adding completely separate systems, the patent minimizes the complexity penalty while achieving improved data flow tracing.
3Productivity
If bit multiplexing is used to increase bandwidth, then data transmission capacity is improved, but network management difficulty increases
Solution Approach 1:
The virtual lane identifiers serve as intermediaries that simplify network management by providing clear mapping between physical lanes and virtual data flows. This intermediary layer manages the complexity of multiplexing internally while presenting a simplified interface for network management operations.
Solution Approach 2:
The feedback mechanism enables automatic realignment of virtual lanes based on identified data flow paths. This automated feedback process reduces the manual intervention required for network management, making the system easier to operate despite the underlying complexity of bit multiplexing.
Data Source
AI summary
A system and method for data flow identification and alignment in a 40/100 gigabit Ethernet gearbox. Virtual lane (VL) identifiers can be identified to create an effective wiring diagram for data flows. This wiring diagram enables a multiplexer or de-multiplexer to align the VL identifiers to match physical lane identifiers.