Ratios, 37 dB is the *best* that can be obtained on a connection through any form of 64Kbps/channel PCM digital carrier. The specification for a voice grade telephone line is only 24 dB. 28.8Kbps to 33.6Kbps (ITU-T V.34 protocol) Indicates the line is so close to perfect that it would be difficult for the Telco to actually measure any change that would improve speed. This means SNR is better than about
