Sobri, Ahmat, Irwan Dinata, and Rudy Kurniawan. “VISUALIZATION OF ASYMMETRIC DIGITAL SUBSCRIBER LINE (ADSL) SYSTEM USING MODULATION QUADRATURE PHASE SHIFT KEYING (QPSK)”. Jurnal Ecotipe (Electronic, Control, Telecommunication, Information, and Power Engineering) 3, no. 1 (April 26, 2016): 1-6. Accessed May 18, 2024. https://ecotipe.ubb.ac.id/index.php/ecotipe/article/view/24.