Houssam wroteI to have replaced all my filters, also tried to connect my modem directly to the phone line (after unplugging all my phones) and same snr margin (the down is good but the up is ~6.7) im not sure if its a modem problem !!! could it be ? or is it strictly a phone line issue ?
it could be a modem problem, I once had the same problem, changed the modem and the snr got +10