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ADSL Transmitter and Receiver filters


I want to work with ADSL and ADSL2/2+ Signals to understand the communication signals. Regarding the analog device circuit, which was uploaded here, I am curious to see a sample of the TX and RX filter circuit that can implement to filter RX and TX signals of the ADSL line.

In addition, I need to know why most of ADSL transformers have two primary and secondary coils instead of one.

I also appreciate introducing any reference book/article about the ADSL line. 

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[edited by: ANEWBIE at 3:46 AM (GMT -4) on 24 Jul 2022]