Analog front-end transmitter and a connection method of an X-digital subscriber line having a pre-distortion mechanism

A connection method of an x-Digital Subscriber Line, comprising:

• providing an x-Digital Subscriber Line to detect a length of connection;
• executing handshaking of the x-Digital Subscriber Line to define a plan of online signal power and bandwidths;
• receiving an input differential signal and generating an output differential signal, wherein the input differential signal comprises a first input signal and a second input signal, and the output differential signal comprises a first output signal and a second output signal;
• calculating a first difference between the first input signal and the first output signal and a second difference between the second input signal and the second output signal to generate a pre-distortion value, and generating a pre-distortion table according to repeatedly detected pre-distortion values;
• selecting a pre-distortion value from the pre-distortion table according to current online signals;
• and
• providing a digital signal processor to adjust a difference between input and output signals of a line driver of the analog front-end transmitter having a pre-distortion mechanism according to the pre-distortion value.

A method for adjusting an output of an analog front-end transmitter having a pre-distortion mechanism, comprising:

• receiving an input differential signal and generating an output differential signal wherein the input differential signal comprises a first input signal and a second input signal;
• the output differential signal comprises a first output signal and a second output signal;
• receiving the first input signal to generate the first output signal;
• receiving the second input signal to generate the second output signal;
• and
• generating a pre-distortion signal according to a first difference between the first input signal and the first output signal, and a second difference between the second input signal and the second output signal so as to adjust the output of the analog front-end transmitter having a pre-distortion mechanism.