Cable Backplane Segmentation for Switch Board Assembly
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Solution Overview
Problem
The challenge in director-class switches is to efficiently connect a large number of ports while simplifying the manufacturing and maintenance processes, as existing solutions often rely on complex printed circuit board (PCB) backplanes that are mechanically constrained and difficult to scale.
Innovation Solution
A director-class switch with a cable-based backplane formed by grouping wires into bundles, allowing for flexible arrangement of boards and reducing mechanical constraints, using modular harnesses with different cable lengths to connect leaf and spine boards, and optionally incorporating power and control cables to distribute power and signals separately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a printed circuit board (PCB) backplane is used to connect leaf and spine boards, then the switch structure is mechanically stable, but the device complexity and difficulty of scaling increase
Solution Approach 1:
The backplane is segmented into multiple individual cable harnesses, each connecting specific port groups between leaf and spine boards. This segmentation allows independent routing and connection management, reducing the complexity of the overall backplane structure while maintaining mechanical stability through organized cable bundles.
Solution Approach 2:
The patent transitions from a two-dimensional PCB backplane to a three-dimensional cable-based architecture. Cables are routed through vertical channels and organized in spatial layers, allowing connections to be established in multiple dimensions. This dimensional change enables more flexible board arrangements and reduces mechanical constraints on the switch fabric.
2Quantity of substance
If a PCB backplane is used to connect a large number of ports, then the switch can service more ports, but the manufacturing and assembly difficulty increase
Solution Approach 1:
The backplane connections are divided into multiple discrete cable harnesses, each handling a specific subset of port connections. This segmentation allows manufacturers to assemble and test individual harnesses separately before final installation, significantly reducing the complexity of manufacturing large-scale switch backplanes with hundreds of ports.
Solution Approach 2:
Cable harnesses are pre-assembled and pre-tested outside the main switch assembly process. Interface port units are pre-mounted on cables before the cables are installed in the chassis. This preliminary preparation of connection components streamlines the final assembly process and enables modular manufacturing approaches.
3Adaptability or versatility
If cables are used to connect interface port units, then the board arrangement flexibility increases, but the number of cable connections to manage increases
Solution Approach 1:
Multiple individual cable connections are merged into bundled cable harnesses. Each harness consolidates multiple signal and power connections into a single organized assembly that connects between specific interface port units. This merging reduces the number of discrete connections that need to be managed while maintaining the flexibility of cable-based board arrangements.
Solution Approach 2:
The patent introduces vertical routing channels and spatial organization layers for cable management. Cables are routed through designated vertical pathways and organized in structured layers within the chassis, transforming the management of numerous cable connections from a chaotic two-dimensional problem into an organized three-dimensional system.
Data Source
AI summary
A main unit of a director-class switch including a wire-based backplane located in a chassis, having a plurality of slots configured to receive switch boards. The wire-based backplane includes a plurality of harnesses each including first and second cartridges, a plurality of interface port units mounted on each of the first and second cartridges and cables connecting each of the interface port units of the first cartridge to each of the interface port units of the second cartridge. The harnesses are mounted in the chassis such that the interface port units face ends of the slots in a manner configured to mate with corresponding connectors of switch boards inserted into the slots. A plurality of interface port units are mounted in each slot. Each cartridge includes interface port units which are located in a plurality of different slots.