Asymmetric digital subscriber line type signal transmission system, has attenuator to attenuate downlink signals with attenuation coefficient, so as to transmit signals attenuated above threshold frequency on telephone lines

摘要

The system has an amplifier (13) to amplify downlink signals provided by a digital subscriber line access multiplexer (7) with an amplification coefficient (G(F)) variable according to the frequency, so as to compensate attenuation of the signals. An attenuator attenuates the downlink signals with an attenuation coefficient, so as to transmit the signals attenuated above a threshold frequency on telephone lines.