These things have always puzzled me:
a) had a Thompson adsl router. On my 2Mbps fixed line the noise margin would be high after a reset and then slowly decline over days until I had to reset it again. The new dlink router doesn't seem to need this periodic refresh. Can anyone explain the technicalities?
b) why do upstream and downstream attenuation figures differ ? Surely its the same piece of wire ?
Thanks to anyone kind enough to answer.