Midplane Interconnect Conductor Twist Mitigation
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Solution Overview
Problem
Midplane interconnects in network switches face increased insertion loss and cost due to cable twist and overlap, which are exacerbated by rising signaling rates, leading to longer cabling lengths and higher power consumption.
Innovation Solution
The solution involves strategically assigning connector signals to reduce or eliminate cable twist and overlap by aligning transmit and receive connections across circuit boards, ensuring that midplane cables connect without crossing, thereby maintaining connector packing density and minimizing insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cable routing is optimized to reduce twist and overlap, then insertion loss is reduced and signal integrity is improved, but connector packing density and cabling complexity increase
Solution Approach 1:
The cable assembly is segmented into multiple independent cables, each connecting specific transmit and receive connections. By dividing the cable bundle into separate segments rather than using a single twisted bundle, the patent reduces overall cable twist and overlap while maintaining connector packing density. Each segment can be independently routed to minimize interference.
Solution Approach 2:
The patent transitions from a two-dimensional twisted cable bundle to a three-dimensional organized cable management system. Cables are routed through vertical slots and organized in layers, utilizing the third dimension (depth/vertical space) to separate cables and reduce twist without increasing horizontal footprint, thereby maintaining packing density.
2Reliability
If cable length is reduced to minimize insertion loss, then signal integrity improves, but connector packing density and heat dissipation challenges increase
Solution Approach 1:
By segmenting the cable connections and reducing unnecessary cable length through optimized routing, the patent minimizes insertion loss while the resulting reduced cable volume improves heat dissipation. Shorter cables generate less heat and allow better thermal management in dense connector arrangements.
Solution Approach 2:
The patent employs flexible cable management structures and thin film-like routing paths that allow cables to be precisely positioned in three-dimensional space. This enables minimal cable length routing while maintaining organizational structure and heat dissipation pathways.
3Area of stationary object
If connector packing density is maintained, then space utilization improves, but cable twist and insertion loss increase
Solution Approach 1:
The patent utilizes three-dimensional cable routing through vertical slots and layered arrangements, moving from planar two-dimensional cable layouts to three-dimensional configurations. This allows cables to connect connectors in space without excessive twist or overlap, maintaining high packing density while reducing insertion loss through optimized cable paths.
Solution Approach 2:
By organizing cables into segmented groups corresponding to specific connector pairs and routing them through dedicated pathways, the patent maintains high connector density while minimizing cable twist. Each segment is independently optimized for its specific connection, reducing overall insertion loss.
Data Source
AI summary
A cabled midplane interconnect system includes a cabled midplane interconnect having a first connection and a second connection. A first circuit board has a third connection configured to be coupled to the first connection. A second circuit board has a fourth connection configured to be coupled to the second connection. The connection orientations are assigned such that a midplane cable, having a plurality of conductors, couples the first connection to the second connection so that none of the plurality of conductors crosses another of the plurality of conductors.