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Which type of avionic architecture was the first to use DIAS?

(a) Centralized architecture

(b) Pave pillar architecture

(c) Federated architecture

(d) Open system architecture

I got this question during an online interview.

The origin of the question is Modular Avionics Architectures & UAV Avionics topic in portion Avionics System Integration of Avionics

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The correct option is (c) Federated architecture

Easiest explanation: Federated avionic architecture is a type of second generation architecture in which the data from each avionic component was converted into digital information and sent to the main frame computer. This technology was called the DIAS or Digital Avionics Information System.

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