Abstract
Computer simulation results that found the range, in kilofeet, of reliable asymmetric digital subscriber line (ADSL) transmission for forward bit rates between 1.6 Mb/s and 9.2 Mb/s and reverse bit rates between 160 kb/s and 1.6 Mb/s are presented. The range is found for homogeneous 24 and 26 gauge loops. Simple, high-performance, baseband pulse amplitude modulation (PAM) is used for both directions of transmission. It is shown that the optimum number of signal levels for the forward channel is always four, if the reverse channel carries basic rate access ISDN. The range is determined for symmetric dual-duplex digital subscriber lines, which transmit the same bit rate in both directions. The range is also determined in the presence of crosstalk from high rate digital subscriber lines (HDSL). >
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