Network Cable Arc Prevention via Remote Fault Detection

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Solution Overview

Problem

Electrical arcs can occur when a network cable connector is disconnected from a device while power is still being carried over the cable, posing safety hazards and risking equipment damage.

Innovation Solution

A method and system that monitor network cables for faults at a remote location from the connector, detect intentionally introduced faults using resistors or latches, and terminate power to prevent electrical arcs upon disconnect.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If power is continuously supplied over the network cable, then the device can operate without interruption, but electrical arcs occur when the connector is disconnected

Engineering Contradiction:

Improvecontinuous operationVSAvoidelectrical arc

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary fault detection by monitoring the network cable for intentionally introduced faults (such as resistors or latches) before disconnecting the connector. When such a fault is detected, the system proactively terminates power supply in advance, preventing the electrical arc from occurring when the connector is subsequently disconnected.

Inventive Principle:

Principle #10Preliminary action

2Object-affected harmful factors

If power is terminated before disconnecting the connector, then electrical arcs are prevented, but the device operation may be interrupted

Engineering Contradiction:

Improveelectrical arc preventionVSAvoidoperation continuity

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The system employs feedback mechanisms by continuously monitoring the network cable for fault conditions. When an intentional fault (resistor or latch) is detected, the system receives feedback about the upcoming disconnect operation and responds by terminating power supply accordingly. This feedback-driven approach ensures power is cut only when necessary, maintaining operation continuity while preventing electrical arcs.

Inventive Principle:

Principle #23Feedback

3Object-affected harmful factors

If fault detection mechanisms are added to monitor the network cable, then electrical arcs can be prevented, but the system complexity increases

Engineering Contradiction:

Improveelectrical arc preventionVSAvoidmonitoring system

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The system introduces an intermediary fault detection mechanism that monitors the network cable for specific fault conditions (resistors or latches). This intermediary monitoring system acts as a mediator between the power supply and the connector, detecting intentional faults and triggering power termination without requiring complex direct control of the power disconnection process itself.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250039039A1Systems and methods for preventing arc on network cable disconnect

Publication Date: 2025.01.30 CISCO TECHNOLOGY INC

AI summary

Presented herein are techniques for preventing an electrical arc upon disconnect of a network cable. A method can include monitoring a network cable connected to a device for faults at a remote location from a connector of the network cable by observing conditions on the network cable of power applied to the network cable, wherein the network cable is for sending data and power. The method can further include detecting a fault on the network cable, wherein the fault was introduced intentionally at the connector prior to disconnecting the connector from the device. The method can further include terminating power at the remote location that is sent over the network cable to prevent an electrical arc upon disconnecting the connector from the device.