...explain why you only qualify for 768 while your neighbor has 1.5 ? Since your neighbor is getting 1.4, i.e. a little over 93%, the line seem uncongested The usual is to get more or less 75%, (i.e. aount 1.2) and that is considered excellent, but at the end of the, you would probably get 50% or less...
Was the linesman trying to sell you something ? Maybe your neighbor has SDSL instead of ADSL ?
I am at the end of the line for dsl, my next door neighbor is subscribed at 1.5 and getting 1.4+ download speed. The company said I qualified for 768, and the lineman came today and said I would have unstable and fluctuating speeds, anywhere from 512 to very slow and said he was going to see about getting me subscribed for the 1.5 output to see if that would help, and he would be right back. He never came back.
My question, would subscribing to the 1.5 vs the 768 help me with this issue?

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