more quantization noise is generated by the analog-to-digital/digital-to-analog conversions in these systems, thus reducing the Signal to Noise Ration (SNR) limiting speed. 19.2Kbps to 26.4Kbps (ITU-T V.34 protocol) Speed in this range generally indicates a bandwidth limited channel. Some older carrier systems and some digital system that packetize and compress data are limited to 19.2 or 21.6Kbps connections. Long cable runs are also reasons for connect rates at 26.4K or below. Lucerne 56k , Lucerne, IN 56k LucerneLucerne , 56k Indiana, Lucerne 56k
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