Maximum reportable attenuation = 63.5 dB, was what I read somewhere, in that modems report this figure when the attenuation is actually much worse.
I wonder what my line plus modem really scores? How bad is the true figure?
It's about four maybe nearer five miles long, presumably thickish copper with no problems in it as the performance figures wouldn't be as good as they are.
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PS: Correction - I originally used a minus sign for attenuation dB, god knows why, corrected it to be positive. I changed the term infinity to maximum