QSFP-DD Backshell with Enlarged Inlet for 26 AWG Conductors
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Solution Overview
Problem
QSFP-DD copper cables face limitations in achieving full bandwidth over longer distances due to the compatibility issues with larger diameter conductors in the existing backshell design, which restricts data transfer speed to short distances.
Innovation Solution
A modified QSFP-DD connector backshell design that accommodates 26 AWG copper conductors and an over-mold strain relief, allowing for bundling of bulk cables to fit within the backshell, with a larger cable inlet and a bundling method that minimizes the overall diameter of the cable bundle to maintain compatibility with industry standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the backshell dimensions are kept compliant with existing QSFP standards, then compatibility with legacy systems is maintained, but the cable diameter is restricted to maximum 27 AWG which limits data transfer distance
Solution Approach 1:
The backshell is divided into multiple components: a body portion with standard external dimensions for compatibility, and an internal cavity portion with enlarged dimensions to accommodate 26 AWG conductors. The locking latch is also segmented with its edge spaced away from the end wall to create additional internal space. This segmentation allows the backshell to maintain external compatibility while providing internal volume for larger conductors that enable longer data transfer distances.
2Reliability
If larger diameter conductors (26 AWG) are used to achieve full bandwidth over longer distances, then data transfer performance is improved, but the conductors no longer fit into the existing backshell design
Solution Approach 1:
The backshell exhibits different dimensional qualities in different regions: the external dimensions and shape maintain standard QSFP compliance for compatibility, while the internal cavity dimensions are locally enlarged to accommodate 26 AWG conductors. Specifically, the internal cavity has increased depth and width, and the locking latch edge is spaced away from the end wall, creating localized space expansion that allows larger conductors to be installed without affecting external compatibility.
3Length of moving object
If the cable inlet diameter is enlarged to accommodate 26 AWG conductors and over-mold strain relief, then larger conductors can be installed, but the backshell internal volume is reduced
Solution Approach 1:
The locking latch is designed with its edge spaced away from the end wall, utilizing the depth dimension of the backshell to create additional internal volume. This dimensional arrangement allows the cable inlet to be enlarged in the radial direction while compensating for volume loss by extending the internal cavity depth, thereby maintaining sufficient internal volume to accommodate 26 AWG conductors with over-mold strain relief.
Data Source
AI summary
Presented herein is a backshell of a Quad Small Form-factor Pluggable Double Density (QSFP-DD) plug configured to be connected to the end of a QSFP-DD copper cable. The backshell includes an over-mold strain relief and 16 pairs of 26 AWG copper conductors. The backshell defines external dimensions and shape that are compliant with the industry standards for a QSFP backshell.