[SI-LIST] ADSL test question

hello all:
when test the transmitted and received signals of ADSL on the telephone line ,I 
find that I can't observe the differential signal by the spectrum analyzer,but 
can observe by oscillograph.The bandwidth of ADSL is within 2MHz,and the 
transmitted signal power of ADSL in CPE is 12.5dbm,and I try to test the PSD of 
it ,but no result.Can anyone give me some advice ? Thanks!

      
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