> Could you tell me what problem will possiblly occur when connecting
>with V.FAST modem (e.g. Supra ) and comming V.34. I mean what the
>difference is between them...
Sure, be happy to. The modems will connect at the lowest common
modulation method, most likely V.32 bis. That assumes that we aren't
talking the USRobotics V.everything modem or the yet-to-be-released
Rockwell V.34/V.FC hybrid. The USRobotics modem incorporates both
V.34 and V.FC, so when the USR and an older V.FC-only modem talk,
they talk V.FC.
Rockwell designed V.FC so that modems with V.FC could interoperate
with V.34 modems, with V.FC modems, with V.32 bis modems, with V.32 modems,
and so forth. Indeed, according to the product manager the original
game plan was for Rockwell to allow their customers to provide V.FC
only, V.34 only, or a combined V.FC/V.34 modem. The handshake sequence
was designed to be different enough from V.34 handshake sequence that
a combined V.FC/V.34 wouldn't drive the V.34-only modem crazy.