Cable Backplane Mounting Blocks for Signal Integrity
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Solution Overview
Problem
Conventional backplanes in communication systems face challenges with signal integrity degradation due to increased density and high-speed signal transmission, and they often fail to withstand the forces exerted during assembly and mating of line and switch cards.
Innovation Solution
A cable backplane system is designed with mounting blocks and spacers that secure cable connectors to the backplane, providing structural stiffness and precise positioning to maintain signal integrity and withstand insertion forces, using a cable rack with trays and raceways to manage cables and connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional backplanes are used to interconnect connectors, then signal transmission is enabled, but signal integrity degrades over longer paths and the backplane cannot withstand forces during assembly and mating
Solution Approach 1:
The system divides the backplane into modular cable assemblies that can be independently positioned and secured. Each cable assembly is a separate unit with connectors at both ends, allowing the signal path to be segmented into manageable sections rather than a single long continuous path, thereby maintaining signal integrity while supporting longer overall distances.
Solution Approach 2:
Mounting blocks serve as intermediary structures between the backplane and cable assemblies. These mounting blocks provide mechanical support and positioning, acting as mediators that secure the cable assemblies to the backplane while withstanding the forces during assembly and mating operations, thus protecting the signal path from mechanical stress.
2Reliability
If cable assemblies are used to replace traditional backplanes, then signal integrity is improved, but packaging becomes difficult and positioning in condensed structure is challenging
Solution Approach 1:
The mounting blocks serve multiple functions: they provide mechanical support for cable assemblies, enable precise positioning, facilitate secure attachment to the backplane, and withstand assembly forces. This multi-functionality reduces the need for separate packaging and positioning components, simplifying the overall system while maintaining signal integrity.
Solution Approach 2:
The mounting blocks are pre-configured with positioning features and attachment mechanisms that enable cable assemblies to be easily positioned and secured to the backplane. This preliminary preparation of the mounting structure simplifies the packaging and assembly process, making it easier to position cable assemblies in condensed structures without compromising signal integrity.
3Manufacturing precision
If backplane boards are used to support cable assemblies, then positioning is enabled, but the backplane cannot withstand forces during assembly and mating
Solution Approach 1:
The system separates the positioning function from the structural support function by introducing dedicated mounting blocks. These mounting blocks are specifically designed to withstand the forces during assembly and mating operations, while the cable assemblies maintain precise positioning through the mounting block's positioning features. This segmentation allows each component to optimize for its specific function without compromising the other.
Solution Approach 2:
The mounting blocks are constructed from materials and structures that provide both mechanical strength to withstand assembly forces and precise positioning capabilities. This composite approach combines the necessary structural properties with positioning features, enabling the mounting blocks to simultaneously support cable assemblies with high precision while withstanding the forces encountered during assembly and mating operations.
Data Source
AI summary
A cable backplane system includes a backplane having a plurality of openings extending between a front and a rear of the backplane. The backplane has mounting locations proximate the openings. Mounting blocks are coupled to the front of the backplane at corresponding mounting locations. The mounting blocks are secured to the backplane by fasteners. A cable rack is coupled to the rear of the backplane and has a tray with a frame surrounding a raceway and spacers coupled to the tray. The spacers hold corresponding cable connectors and are secured to corresponding mounting blocks to position the spacers and cable connector assemblies relative to the backplane. The cable connectors are received in corresponding openings in the backplane and are held in position relative to the backplane by the spacers and mounting blocks.