On Tue, Nov 16, 2010 at 11:39 AM, Herbert Graf wrote: > The max theoretical bandwidth from analog end to analog end is about > 35kbit/s. That sounds right to me as a practical limit, but not a theoretical limit. Where did you get that from? If it were a purely analog line then the throughput would be governed by the bandwidth (fixed at about 8kHz) and the signal to noise ratio (which could always be improved and so does not impose a theoretical limit). That leaves the digitization step as the theoretical limit and that is 64 kbit/sec. Sean --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .