13-09-14, 09:27 PM
not especially, although if your profile is set incorrectly then any variances in speeds will be noticed more on a higher SNR as it reduces the amount of flexibility in what the line can achieve as the exchange is being told to keep the broadband signal at 12dB above the system noise, although it will help to a certain extent in trying to stabilise it if the system noise is excessive.
Is the phone line crackling or noisy at all, or even humming?
Is the phone line crackling or noisy at all, or even humming?