On Thu, 21 Nov 2002 12:22:27 EST, [email protected] wrote: >1) The maximum possible modem-to-modem connect speed through the PSTN is V.34 >33,600 bps. To get V.90 speeds you must have a V.90 modem connected to a >"digital modem" at the central office. In other words, there is only one >analog hop in a V.90 connection. V.90 works fine for internet access, but >V.90 is not possible for two analog modems connected through the PSTN. >
>3) The maximum 33,600 bps rate for a V.34 modem requires an extremely clean >channel. For example, this rate can only be achieved on about 5% of the >connections through the North American PSTN. On the other hand, a good V.34 >modem will achieve rates of at least 26 K on over 90% of the connections >through the PSTN. Comment please: I have two USR 5560 PC Card modems hooked up back to back over a very clean circuit (basically just two battery-feed circuits connected by two 1 uF capacitors). My terminal program always reports connection at 31200 V42bis whether I enable or disable compression. Why might I not get 33600? Could it be something about the modems? Thanks to all of you who offered comments on this. Jeffrey Race
