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The present paper deals with an important issue for the present digital world, namely the quality control of the optic fiber used in transmitting the internet, television, landline or mobile telephony and other digital content connection. Romania, the country with one of the most developed high-speed internet networks in the world, needs modern methods to test the fiber already in use, the one to be installed, as well as the welded connections between them. The paper presents the theoretical model of transmitting ...