I have read through your article on Navas Cable Modem/DSL Tuning
> Guide, we have to replaced our dimmers switches that has the
> capability of filtering out RFI interference.
What you want are switches with RFI filtering to prevent interference with DSL.
My question is, is there any RFI inteference filter that can be used
> to connect the phone line to the RFI Filter and from the RFI Filter
> to the ADSL2 Modem?
RFI filters are used to block interference on frequencies used by DSL, so they would also block the DSL signal itself.