<communications> A scheme to maximise use of a communications line by
giving a larger share of the bandwidth to the modem at the end which is
transmitting the most information.
Only one end of the connection has full bandwidth, the other has only a fraction
of the bandwidth. Normally, which end gets the full bandwidth is chosen
Asymmetrical modulation was made famous by the HST mode of the early high-speed
modems from US Robotics.
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