Patent ID: 6977971

Claim:
A digital data transmission system including at least one first unit that transmits a first MLT3 (Multi-Level Tone 3) signal containing digital data over at least one cable, at least one second unit that receives the first MLT3 signal and recovers the digital data, and transformers that uncouple the first and second units from the cable, said second unit comprising: an equalizer that receives the first MLT3 signal at an input, and outputs a second MLT3 signal; a recovery module for the transmitted digital data that receives the second MLT3 signal; and a device placed in feedback to the equalizer, the device receiving the second MLT3 signal and outputting a third signal that is added to the first MLT3 signal at the input of the equalizer, wherein the device includes a translation block for up or down or no translation of the second MLT3 signal according to the low or high or intermediate value of the second MLT3 signal, and a low pass filter that receives a signal output from the translation block and outputs the third signal that contains a low frequency component of the second MLT3 signal.