USB Backplane Scalability via Tiered Hub Architecture
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Solution Overview
Problem
Conventional backplane technologies are not easily scalable to support a large number of field I/O and/or communication boards, and they struggle to achieve deterministic data updates within the required time frame while maintaining cost-effectiveness and reliability.
Innovation Solution
A high-speed scalable backplane system utilizing a tiered architecture of Universal Serial Bus (USB) hubs, which enables communications between a central processing unit (CPU) module and multiple field I/O and/or communication modules, providing a robust and noise-immune solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional backplane technologies are used to support field I/O and communication boards, then the system can maintain simplicity and passive operation, but the scalability to support a greater number of boards is limited and the turnaround time exceeds 1 millisecond
Solution Approach 1:
The backplane is segmented into multiple functional modules including USB hubs, field I/O boards, and communication boards, each operating as independent units connected through standardized USB interfaces. This segmentation enables parallel data processing across multiple boards simultaneously, achieving sub-millisecond turnaround times while maintaining modular simplicity
Solution Approach 2:
USB hubs serve as intermediary devices between the CPU module and multiple field I/O boards, managing data traffic and enabling deterministic updates. The hubs act as mediators that coordinate communication across the backplane, achieving fast turnaround times without requiring complex active components in every board
2Productivity
If active components are used in conventional backplanes to achieve faster turnaround times, then the screw-to-screw turnaround time can be reduced below 1 millisecond, but the reliability decreases and repair cost increases
Solution Approach 1:
The design uses passive backplane components that can be easily replaced if needed, combined with USB technology that is inherently reliable and widely supported. The passive nature of the backplane eliminates failure-prone active components while the standardized USB interfaces ensure continued operation and ease of replacement
Solution Approach 2:
USB interfaces provide universal communication capability across all backplane boards, allowing a single standardized protocol to handle diverse field I/O and communication functions. This universality ensures reliable operation across different board types without requiring board-specific active components
3Adaptability or versatility
If conventional backplane technologies are used to support additional I/O modules, then the system can expand functionality, but the infrastructure cost is doubled for every additional module
Solution Approach 1:
All field I/O boards and communication boards use the same USB interface standard, eliminating the need for different infrastructure components for each board type. A single USB hub design can support multiple boards, and the standardized interfaces allow easy expansion without doubling infrastructure costs
Solution Approach 2:
The backplane uses a tiered USB hub architecture that expands connectivity in a hierarchical dimension rather than requiring linear addition of components. Multiple boards can share USB hub resources, allowing scalable expansion where infrastructure costs do not linearly increase with each additional I/O module
Data Source
AI summary
A high-speed scalable backplane enables communications between a central processing unit (CPU) module and field input/output (I/O) and/or communication modules. The backplane comprises a root hub associated with the CPU module. The backplane also includes a plurality of Universal Serial Bus (USB) hubs sequentially coupled to each other and arranged according to the tiered architecture. Each of the USB hubs has an upstream port and a plurality of downstream ports. A top USB hub has an upstream port coupled to a host port of the root hub. One or more lower USB hubs each have an upstream port coupled to a selected downstream port of one of the USB hubs in an immediately preceding tier of the tiered architecture. The lower USB hubs are each configured to enable a plurality of I/O and/or communications connections for the modules via a plurality of downstream ports.