measure SNR for v.90 connections will show values from 45 dB for lower speeds all the way up to 55-60 dB with higher speed connections), plus a digital connection to the ISP which has exactly one Analog-to-Digital conversion (the codec in the line card for your line at the Telco switch) between you and the ISP. V.90/92 modems preferentially connect in V.90 mode if they cannot they automatically fallback to V.34.
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