AVR-Chat

It depends on what the modem is "talking to". If it is a
conventional modem, then there may be a series of handshake
steps to establish the correct baud rate. There is more to
the modem protocol than just the bit decoding - the
arbitration, as it is called, is also a big part. You also
need to make sure that the modem at the other end is able
to connect with the protocol you have chosen.

Jim

On Fri, 30 Sep 2005 09:13:19 +0800
 "Farzlina Ab.Hadi" <elin@sapura.po.my> wrote:
> hi everyone!
> 
> i am doing a modem communication for a telephony design.
> we decided to use
> the v.22bis protocol for modem comm. on my observation,
> when working at
> 2400b/s, after handshake , there will be stream of
> garbage seen on the hyper
> terminal. so my tx and rx is definitely out. but very
> clean when doing
> 1200b/s. tx and rx of data is ok. 
> 
> may be it is something to do with the telephony board
> design.it must have
> created some noise that would interfere the comm at
> 2400b/s. because when i
> test from ext. modem to another ext. modem, it is ok at
> 2400b/s. 
> 
> hopefully someone could give some input or ideas. thank
> you very much for
> any reply!
> 
> rgds,
> elin

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