Automated AFDX Ethernet Signal Testing System
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Solution Overview
Problem
Automated testing of Ethernet devices in avionics Full Duplex (AFDX) network environments is challenging due to the need for stringent pre-flight validation of COTS devices to ensure safety, as in-flight replacement of failed devices is not feasible without disrupting communication.
Innovation Solution
A system for automated testing of Ethernet signals in a simulated AFDX network environment, involving a measurement module that modifies and evaluates Ethernet signals using RF attenuators and 10 Base-T Ethernet simulation circuits, with a switching module defining communication paths and a display module for data storage and evaluation of signal characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If COTS Ethernet devices are used in avionics networks to increase bandwidth and reduce cost, then productivity and cost-effectiveness are improved, but reliability and safety are worsened due to the inability to perform in-flight replacements
Solution Approach 1:
The patent implements comprehensive automated testing of COTS Ethernet devices before they are installed in avionics networks. The testing system validates devices in a simulated AFDX environment that replicates actual avionics network conditions, ensuring devices meet stringent reliability requirements prior to deployment. This preliminary validation prevents unreliable devices from entering service, thereby maintaining safety while enabling the use of cost-effective COTS components.
2Reliability
If automated testing is implemented in a simulated AFDX network environment, then reliability of pre-flight validation is improved, but device complexity and testing setup requirements are worsened
Solution Approach 1:
The patent creates a simulated AFDX network environment that replicates the characteristics and behavior of actual avionics networks. This virtual copy includes simulated network switches, protocol stacks, and failure modes that mirror production systems. By testing in this copied environment rather than requiring complex physical test setups, the system achieves high validation reliability while managing complexity through virtualization and software-based simulation.
3Measurement precision
If comprehensive signal measurements are performed including differential signal, amplitude symmetry, rise time, fall time, duty cycle distortion, transmit jitter, and overshoot, then measurement precision is improved, but testing time and complexity are worsened
Solution Approach 1:
The patent implements continuous automated measurement of multiple Ethernet signal characteristics simultaneously during the testing process. The measurement system continuously monitors differential signal quality, amplitude symmetry, rise time, fall time, duty cycle distortion, transmit jitter, and overshoot without interruption. This continuous measurement approach captures transient issues that intermittent testing might miss, achieving comprehensive precision while reducing total test time through parallel measurement of all parameters rather than sequential testing.
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
Enables reliable pre-flight validation of Ethernet devices by simulating AFDX network conditions, ensuring compliance with ARINC standards and preventing in-flight communication disruptions.
Implementation Method 1
Such modification includes attenuating the Ethernet signals with an RF attenuator
Implementation Method 2
A display module coupled to the data storage module retrieves the data representative of the Ethernet signal's characteristics, such as differential signal, amplitude symmetry, rise time, fall time, duty cycle distortion, transmit jitter, and overshoot for display
Data Source
AI summary
A system for automated testing of Ethernet signals of a unit under test (UUT) in a simulated Avionics Full Duplex (AFDX) network environment. The UUT may be any Ethernet device, including a 24 port Ethernet switch. Ethernet signal are received from a UUT by a measurement module that is adapted to modify the Ethernet signals according to a condition indicative of an AFDX network environment. Such modification includes attenuating the Ethernet signals with an RF attenuator or terminating the Ethernet signals with a 10 Base-T Ethernet simulation circuit. Modified signals are then monitored or evaluated to determine functionality of the UUT.