Rack System Backplane Segmentation for Signal Loss Reduction
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Solution Overview
Problem
Large networking equipment systems face challenges in manufacturing and cooling due to the need for extensive backplanes, which are impractical and expensive, and suffer from significant signal losses and airflow inefficiencies.
Innovation Solution
A rack system architecture utilizing multiple separate backplanes and air flows, where line cards are connected to fabric cards using distinct backplanes, allowing for standard-sized components and reduced signal loss, and incorporating baffles for efficient airflow similar to smaller systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single large backplane is used to connect all line cards in a large rack system, then the system can accommodate a large number of network cards, but the backplane becomes impractical to manufacture, expensive, and suffers from significant signal losses
Solution Approach 1:
The patent divides the large rack system into multiple smaller chassis, each with its own backplane. Line cards are distributed across these chassis, and fabric cards provide inter-chassis connectivity. This segmentation allows each backplane to remain manageable in size while the overall system accommodates a large number of network cards through the distributed architecture.
2Adaptability or versatility
If a single large backplane is used, then connectivity between all line cards is achieved, but signal losses increase significantly
Solution Approach 1:
By segmenting the system into multiple chassis with smaller backplanes, the physical distance and complexity of signal paths are reduced. Each backplane handles only local connectivity, and long-distance communication occurs through standardized fabric card interfaces, reducing signal degradation.
3Temperature
If traditional cooling schemes are used in large rack systems, then cooling coverage is attempted, but airflow inefficiencies occur due to the large system size
Solution Approach 1:
The cooling system is divided into multiple independent cooling zones, one for each chassis. Each chassis has its own cooling resources that manage airflow locally, preventing airflow inefficiencies that would occur in a single large cooling system. This segmentation allows each cooling zone to be optimized for its specific thermal load.
4Ease of manufacture
If multiple separate backplanes are used instead of a single large backplane, then standard-sized components can be used and signal loss is reduced, but the system complexity increases
Solution Approach 1:
The fabric cards serve as universal interfaces that can connect to multiple different chassis and backplane configurations. This multi-functionality allows standardized fabric cards to work across different chassis types, simplifying the overall system architecture despite the presence of multiple backplanes. The fabric cards provide a common interface layer that abstracts the complexity of the distributed backplane structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the use of standard-sized components, reduces signal losses, and provides effective cooling without the need for expensive designs, maintaining performance comparable to larger systems while being more cost-efficient.
Implementation Method 1
the baffle divides air flow over the fabric card into a first air flow and a second air flow
Data Source
AI summary
A rack system may include a first plurality of line cards, where a particular one of the first plurality of line cards receives or sends packets via ports; a plurality of fabric cards, where a particular one of the plurality of fabric cards includes a switching fabric; a second plurality of line cards, where a particular one of the second plurality of line cards receives or sends packets via ports; a first backplane that connects the first plurality of line cards to the plurality of fabric cards; and a second backplane that connects the second plurality of line cards to the plurality of fabric cards.