Distribution Point Unit Thermal Management via Conductive Heat Sink

Solution Overview

Problem

The fiber to the distribution point (FTTdp) architecture faces challenges in thermal management for active distribution point equipment due to size constraints and inefficient convective heat dissipation in buried underground deployments, where air exchange is not possible.

Innovation Solution

A distribution point unit with a casing that includes an electronic board for processing optical and electrical signals, a heat transferring device with a conductive heat sink, and a tray for efficient thermal coupling to the casing, providing effective heat dissipation through conductive means.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If natural or forced convection of air through a finned heat exchange body is used for heat removal, then heat dissipation efficiency is improved, but in buried underground deployment with sealed enclosures air exchange is not possible making convective heat dissipation inefficient

Engineering Contradiction:

Core Design Contradiction:

TemperatureVSAdaptability or versatility

Solution Approach 1:

The patent replaces the convective cooling system (which requires air flow and moving parts like fans) with a conductive cooling system using a heat transfer device that directly conducts heat from the electronic component to the enclosure wall. This substitution eliminates the need for air exchange while maintaining effective heat dissipation in sealed buried environments.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a heat transfer device as an intermediary component between the electronic component and the enclosure. This intermediary conducts thermal energy from the heat-generating component through a thermal interface material to the enclosure wall, enabling heat dissipation without requiring direct contact or air flow between the component and external environment.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If large scale environmentally protected cabinets are used for housing Distribution Point Equipment, then environmental protection and thermal management are improved, but in FTTdp model the equipment must be deployed in rougher and size-constrained environmental conditions like handholds

Engineering Contradiction:

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent merges multiple functions into a single compact enclosure that combines environmental protection, heat dissipation, and equipment housing in one integrated structure. The enclosure directly serves as both the protective barrier and the heat sink, eliminating the need for separate cooling systems or larger cabinet structures.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies local quality by concentrating heat dissipation capabilities at the specific location where electronic components are mounted, using the enclosure wall directly adjacent to the component as the heat sink. This localized approach allows effective thermal management in a compact volume rather than requiring uniform cooling throughout a large enclosure.

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If hardened fiber optical connectors are used for outside plant environment, then water protection is improved, but thermal management becomes a major challenge due to size constraints

Engineering Contradiction:

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

The patent makes the enclosure multi-functional by designing it to simultaneously provide environmental protection (water and dust sealing), mechanical protection, and active thermal management. The same sealed enclosure that protects against water ingress also serves as the primary heat dissipation pathway through conductive coupling to the electronics inside.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution enables efficient heat dissipation in a compact form factor, preventing overheating of electronic components and ensuring reliable operation in constrained environments.

Implementation Method 1

at least one heat transferring device having a first section with a first end and an adjacent second section with a second end... The first end of the at least one heat transferring device is thermally coupled to the at least one electronic component. The second end of the at least one heat transferring device is thermally coupled to the casing

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS10641978B2Distribution point unit for coupling external electrical and optical cables

Publication Date: 2020.05.05

AI summary

A distribution point unit for coupling an external electrical and optical cable comprises a casing comprising a first port to receive the external optical cable and a second port to receive the external electrical cable. The distribution point unit comprises an electronic board comprising electronic components and at least one heat transferring device. A tray comprises at least one hole to receive a section of the at least one heat transferring device. The at least one heat transferring device is thermally coupled to at least one of the electronic components to thermally couple the at least one electronic component to the casing.