Does Internet Speed Vary by Season?

Steve Meuse smeuse at
Wed Oct 7 17:46:15 UTC 2009

joel jaeggli expunged (joelja at

> ADSL systems will retrain to a lower rate as line conditions (SNR)
> change for the worse. The attentuation characteristics of a given pair
> will change of time due to a number of factor, including but not
> certainly limited to physical wear, moisture invasion, localized source
> of interference, sunspot activity etc.
> Are dsl plants subject to localized environmental conditions? Absolutely.

I could be convinced that extremem heat could change a cables velocity factor, but that should only result in slight changes in phase, which I guess would result in a higher BER. 

Oh, and you forogot about cosmic rays :)


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