Fiber Optic Terminal With Tongue-and-Groove Sealing
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Solution Overview
Problem
Conventional fiber drop terminals (FDTs) are large, expensive, inconvenient to install and service, and lack secure access and wind-driven-rain sealing, making them unsuitable for compact installations in multiple dwelling units (MDUs) where space and security are concerns.
Innovation Solution
A compact fiber optic terminal design featuring a base and cover with a tongue-and-groove sealing mechanism, removable for access, and a skirt for slack storage, along with mounting plates and extensions for secure and convenient mounting on vertical surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional FDTs are used to provide optical connectivity in MDUs, then optical connectivity is achieved, but the device size and footprint become too large for compact installations
Solution Approach 1:
The FDT is divided into separate functional components: a base unit containing mounting and connection features, a removable cover for access, and a detachable skirt for cable management. This segmentation allows each component to be optimized independently and enables compact installation while maintaining full functionality.
Solution Approach 2:
The invention transitions from a conventional horizontal mounting approach to vertical wall mounting, utilizing the vertical dimension to reduce floor footprint. The base includes mounting plate features that enable secure vertical installation, effectively moving the device into underutilized vertical space in MDU environments.
2Reliability
If conventional FDTs are used, then optical connectivity is provided, but access to optical connections becomes difficult and insecure
Solution Approach 1:
The cover is designed with pre-configured access features including finger engagement surfaces and alignment indicators that guide technicians through the access process. The mounting plate includes pre-positioned cable management features and connection points that are readily accessible once the cover is removed, eliminating the need for additional manipulation steps.
Solution Approach 2:
The cover transitions from a fixed sealed state to an accessible open state through a simple removal mechanism. The dynamic design allows the cover to be easily detached and reattached, providing secure protection when closed and convenient access when opened, with the sealing interface maintaining integrity through repeated cycles.
3Reliability
If conventional FDTs are installed, then optical connectivity is achieved, but wind-driven-rain sealing requirements are not met
Solution Approach 1:
The sealing interface utilizes a flexible grommet or elastomeric seal that conformally engages between the cover and base. This flexible sealing element accommodates minor manufacturing tolerances and thermal expansion while maintaining a weather-tight barrier against wind-driven rain, meeting stringent environmental sealing requirements.
Solution Approach 2:
The sealing system combines rigid base and cover structures made from durable polymers or metal with a flexible sealing material such as rubber or silicone. This composite approach provides both structural integrity for mounting and sealing performance for environmental protection, achieving both mechanical and weatherproofing requirements.
4Reliability
If conventional FDTs are used, then optical connectivity is provided, but slack storage for fiber optic cables is insufficient
Solution Approach 1:
The skirt is integrated with the base through mechanical attachment features such as clips, tabs, or snap-fits, combining cable management functionality with the structural mounting component. This merging eliminates the need for separate cable management devices while providing adequate slack storage capacity for multiple fiber optic cables.
Solution Approach 2:
The skirt serves multiple functions simultaneously: it provides slack storage for drop cables, acts as a protective barrier for connection points, and may include additional mounting features for securing cables to the wall. This multi-functionality reduces overall device complexity while addressing multiple requirements.
Data Source
AI summary
There is provided fiber drop terminal (“FDT”) assemblies for providing selective connections between optical fibers of distribution cables and optical fibers of drop cables, such as in multiple dwelling units. The FDT assemblies include a base and a cover that define a tongue and groove that selectively engage to seal the base and cover. The FDT assemblies also include a mounting plate for mounting of the base and cover, as well as a mounting plate extension for mounting of a skirt. The skirt provides slack storage for drop cables exiting the FDT. The components of the FDT assembly are selectively interlockable to prevent unauthorized access to the interior cavity of the base and cover and to the slack storage area of the skirt.