Do you have to use a PIC? If not, you could use a Rabbit=
 Semiconductor
RCM2300 module and external modem module. They have the PPP and=
 TCP/IP
functions in their library. They also have sample applications to=
 get
you up and running quickly. They are plug-in modules and not very=

expansive. You could also use the PIC as a slave device to the=
 Rabbit
via USART (the Rabbit has 4 of 'em) if the PIC portion of your=
 project
is already complete. You could probably get your application up=
 and
running in a few days.

http://www.rabbitsemiconductor.com/products/rcm2300/index.html

I actually have had one of their TCP/IP development kits running=
 a web
server for quite some time now at:

http://64.32.150.109/index.html

The Rabbit module is quite capable and fexible, but might be=
 overkill
for your application. you could also try Cermetek and other=
 embedded
modem manufacturers. I've seen several that had TCP/Ip stacks=
 built
into the modem. You just talk to the modem module with the PIC's=
 USART
and send it high level commands. It takes care of all the TCP/IP=
 and
ISP overhead.

Matt Pobursky
Maximum Performance Systems

On Thu, 1 Aug 2002 21:29:42 -0300, Eron wrote:
>Hello friends,
>
>I=B4m working in a project that demands to connect a 16F877 to a=
 web
>server computer dialy to send some data colected by PIC during=
 the
>day.
>
>I was thinking in use a Seiko S-7600 TCP-IP Stack + Modem Chip=
 (Like
>CML Micro CMX868) to connect by PSTN.
>So, I heard that Seiko will discontinue the S-7600 part and I=
 felt
>discouraged. =A0
>
>Is this information true??
>
>How can I implement a TCP-IP Stack?? =A0There are others chips for=
 this
>purpose (like S-7600) having conectivity with PSTN modems?? =A0 =A0
>
>Any suggestions are welcome.

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