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My connection is consistently 50,666 bps here in downtown Chicago. It was my understanding that the X2 technology (and probably the similar competing technologies along with the winner .v90) utilize both the upswing and downswing of the transmitted signal to transmit bits of data. Therefore, I would think that a 30,000 Hz signal (the maximum frequency that phone lines were designed to operate) could actually transmit, under optimal conditions, 60,000 bps. Hence, the 56K standard. Does this sound right?
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