I have an ADSL modem that doesn't represent the phone line parameters (Signal-to-Noise Ratio Margin, Line Attenuation, and etc.), and I'm looking for a software to do it for me . Please help me.
Dear: I do not think it is possible that you can measure the parameters that you mention using software only those parameters, because you will require some equipment that allows you to do it. I recommend you use an RTLSDR, which are very cheap (less than 7 USD) and there if you use any of the applications for SDR. I give you the link to take as an example, but you can use other better ones: