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Message: [QUOTE="Rob Warnock, post: 1963535"] +--------------- | QAM and other modulation schemes have been proposed but never really | caught on. ... QAM only halves the baud or symbol rate compared to | the data rate by encoding 2 bits per baud. +--------------- True, QAM is seldom used in baseband copper, though note that GbE uses PAM-5 (2 b/Baud + some slight coding). Where QAM *has* been really pushed is in CATV RF nets, where QAM-64 (6 b/Baud) and QAM-256 (8 b/Baud) are fairly common. Of course, now that the RF nets (including RF-over-fiber) are being displaced by digital fiber... ;-} -Rob [/QUOTE]