The following couple of audio lecture discuss PSTNs, POTS, DSL, ADSL, modulation techniques (FM, AM, PSK, QAM) and multiplexing techniques (TDM, FDM, CDM).
Photo by taryn_nefdt 
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PSTN, ADSL, Modulation Techniques and Multiplexing by Psyops Prime is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
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