FELIX: the New Detector Readout System for the ATLAS Experiment

Starting during the upcoming major LHC shutdown (2019-2021), the ATLAS experiment atCERN will move to the Front-End Link eXchange (FELIX) system as the interface betweenthe data acquisition system and the trigger and detector front-end electronics. FELIX will function as a router between custom serial links and a commodity switch network, which will useindustry standard technologies to communicate with data collection and processing components.This paper describes the FELIX system design as well as the results of the ongoing developmentprogram