ATions> A scheme to maximise use of a communicATions line by giving a larger share of the bandwidth to the modemAT 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 dynamically. Asymmetrical modulATion was made famous by the HST mode of the early high-speed modems from US Robotics. (1998-03-13)