Cable Mesh Switch Fabric Assembly for Signal Latency Reduction
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Solution Overview
Problem
As the number of line cards in network switches increases, the size and cost of the fabric cards and backplane also grow, leading to longer high-speed links that suffer from signal loss due to attenuation, which is costly to address with signal amplification and repeaters.
Innovation Solution
A switch fabric assembly using a cable mesh to connect line card connectors to switch ASICs, reducing signal latency and material usage, and allowing for customizable configurations that maintain compatibility with existing line cards without requiring chassis replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of line cards in network switches increases, then the connectivity and capacity of the network switch improves, but the size and cost of the fabric cards and backplane increase, leading to longer high-speed links that suffer from signal loss due to attenuation
Solution Approach 1:
The patent introduces cable mesh assemblies as intermediary components between line cards and switch fabric ASICs. These cables act as mediators that can be dynamically connected or disconnected, allowing the system to achieve high connectivity capacity while maintaining signal quality by only activating the necessary signal paths rather than having all line cards permanently connected to all fabric ASICs through long backplane traces.
2Adaptability or versatility
If the number of line cards in network switches increases, then the connectivity and capacity of the network switch improves, but the cost of signal amplification and repeaters increases to address attenuation
Solution Approach 1:
The patent implements a dynamic cable mesh architecture where connections between line cards and switch fabric ASICs can be selectively activated or deactivated based on actual traffic needs. This dynamic reconfiguration allows the system to scale connectivity capacity without proportionally increasing the number of active signal paths that would require amplification and repeaters, thereby reducing the complexity and cost of signal conditioning equipment.
3Speed
If traditional backplane structures are used to connect line cards to switch fabric, then signal transmission is achieved, but signal latency increases and material consumption increases
Solution Approach 1:
The patent segments the traditional monolithic backplane structure into separate cable mesh assemblies that connect line cards to groups of switch fabric ASICs. This segmentation allows for shorter, more direct signal paths between connected components, reducing signal latency while maintaining transmission speed. The cable mesh architecture enables selective connectivity where only necessary signal paths are established, avoiding the latency inherent in long backplane traces that must support all possible connections.
4Speed
If traditional backplane structures are used to connect line cards to switch fabric, then signal transmission is achieved, but material usage and cost increase
Solution Approach 1:
The patent applies local quality by creating cable mesh assemblies with connectivity patterns tailored to specific local requirements rather than providing uniform full-mesh connectivity across the entire backplane. Each cable mesh assembly is optimized for its local group of line cards and switch fabric ASICs, using materials only where needed for actual signal transmission paths. This localized approach significantly reduces overall material consumption compared to a traditional backplane that must physically support all possible connections across the entire system.
Data Source
AI summary
A network device may include multiple line cards and a switch fabric assembly electrically connected to the line cards. The switch fabric assembly includes: for each of the line cards, a line card connector providing electrical connectivity between the line card and one or more cables; a cable mesh assembly including the cables, the cables providing electrical connectivity between each line card connector and multiple switch connector groups; and multiple switch application specific integrated circuits (ASICs), each of the switch ASICs being electrically connected to one of the switch connector groups.