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Hello everyone

Before I begin t ask my question, I apologise for my bad English and also if here is not the right place to ask this question.
I'm an Electronics technician and my question is:

How can I measure ADSL line "attenuation" and "SNR Margin"? The only way is to request theme from the ADSLAM by a process similar to "Modem Initial training" or I can measure theme whitout connecting to ADSLAM and just by measuring signal parameters.

Your sincerely.