On 16 November 2010 11:39, Herbert Graf wrote: > The fact that one end is digital (i.e. an ISP) allows for V.90 and V.92 > which are capable of 56/33.6 and 56/48 respectively. A little trouble with that wording for me, help me with "end"? You likely have an analogue loaded loop for both directions of transmission up to the nearest CO, then likely a PCM channel bank card or newer equivalent aggregating into a high speed digital channel in the backhaul to the next CO. AFAIR- unlike us, Europe embraced ISDN and maybe 2B+Q over non-loaded loops is the norm so 48K+ is "digital" to them? D --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .