Patent ID: 6393062
Filing Date: 2002-05-21
Classification: H04L

Abstract:
A method for generating a binary communication signal suitable for use over a communications cable having low-pass filter characteristics, the method comprising the steps of:generating a preemphasis waveform for a first time period, the preemphasis waveform having a preemphasis magnitude; applying the preemphasis waveform to the communications cable; generating a standard waveform for a second time period substantially immediately following generation of the preemphasis waveform, the standard waveform having a standard magnitude, the standard magnitude being within a communications specification, the preemphasis magnitude being larger than the standard magnitude; applying the standard waveform to the communications cable, wherein the binary communications signal includes the preemphasis waveform and the standard waveform, and the first time period being on the order of a baud period defined by the communications specification, whereby the preemphasis waveform at least partially precompensates for anticipated high-frequency energy losses in the communications cable caused by the low-pass filter characteristics of the communications cable.