joel jaeggli expunged (joe...@bogus.com): > 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 :) -Steve
