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We are talking a 5V or something as trivial (can't recall the V and I requirements over telecoms lines (phone lines) , been several years since I did the courses), which will be high kHz or low MHz superimposed on the 50Hz AC signal (power) .... trival signal intensity for any ADSL or ADSL2 leakage.
Take a look at the RJ11 or RJ12 cable coming out the wall and going to your modem or PC . It has no effect on the analog and digital TV picture , and that cable once it enters the house is unshielded too.
That wireless adapter has no effect either.
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