Transceiver Module Stopper Positioning for Incompatible Cage Prevention
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Solution Overview
Problem
Low-profile transceiver modules can be erroneously inserted into larger incompatible receptacle cages, risking damage to the host connector and unstable support, leading to potential breakdowns.
Innovation Solution
A transceiver module assembly with a housing featuring side wall portions and stopper pieces that restrict movement when inserted into incompatible receptacle cages, ensuring proper alignment and preventing erroneous connections by adjusting the projection of the module board to fit only compatible cages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If low-profile transceiver modules are designed with smaller dimensions to increase arrangement density, then productivity and space utilization are improved, but the risk of erroneous insertion into incompatible receptacle cages increases
Solution Approach 1:
The patent applies asymmetry by designing stopper pieces with specific geometric shapes (L-shaped cross-section) and positioning them at predetermined locations on the inner peripheral surfaces of side walls. These stopper pieces create asymmetric mechanical constraints that allow correct insertion while preventing erroneous insertion into incompatible receptacle cages, thus maintaining reliability while enabling low-profile design for improved productivity
2Reliability
If stopper pieces are positioned to restrict transceiver module movement in incompatible receptacle cages, then reliability is improved by preventing erroneous connections, but device complexity increases
Solution Approach 1:
The patent segments the receptacle cage structure by integrating stopper pieces as separate functional elements at predetermined positions on the inner peripheral surfaces of side walls. This segmentation allows the stopper pieces to independently perform the function of preventing erroneous insertion, achieving improved connection accuracy while keeping the overall device complexity manageable through modular design
3Volume of moving object
If the projection length of the module board is reduced to fit low-profile designs, then compactness is improved, but the risk of unstable support and connector damage increases
Solution Approach 1:
The patent applies preliminary action by positioning stopper pieces in advance at specific locations within the receptacle cage before the transceiver module is inserted. These pre-positioned stopper pieces immediately restrict the module's movement upon insertion, providing stable support and preventing connector damage even when the module board has reduced projection length for low-profile design
Data Source
AI summary
A length of a protection wall, which is greater than a length of projection of a connecting end portion of a plug connector from opening end portions of an upper case as well as a lower case of an optical module, is set to be smaller than an interval between a contact surface of each of lower stopper pieces of a receptacle cage to come into contact with an end surface of a side wall as well as an end surface of an end surface of the lower case and an opening end surface of a slot of a host connector.