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Clearly, each the chain of network components and the required high quality of sign will probably be different for providers apart from analog video. Particularly, it seems that various levels of QAM (from QPSK to 256-QAM) will likely be used to move digitally modulated downstream signals, whereas lower levels of digital modulation, such as BPSK, QPSK, and possibly 16-QAM, will be used in the upstream