> 
> >It sounds like either the modems or the other end decides to terminate the
> >link. Your pppd would (I think) say if it chose to quit.
> 
> I don't know why the other end would terminate.  I hope that's not the
> case, but it is a possibility.

Thinking about it, I'd expect the other end would tell your pppd that the
connection was going down.

> >Try ftp'ing something TO another site.
> >
> 
> I did try that and many times when I tried to upload, the FC (flow control)
> light on my modem who go low and ftp would continue to send for about 5
> seconds until it found that it wasn't getting a response.  Then the light
> would turn on and data was sent again.

??? What does the modem book say the FC light going off means? If it means
the modem has asked the mac to stop, FTP HAD BETTER STOP. IMMEDIATELY.
And it will, with crtscts set and a correct modem cable.

What does ftp do to indicate it's still sending data? Is it still printing
hash marks? Because if the modem tells the mac to hush, I'd expect the
io lights to keep going. I think they mean IO on the modem side, while
the modem's emptying the buffer.

> I've continued to make adjustments to my pppd options and my modem init
> string but nothing seems to keep the connection while sup is transferring.
> Sometimes the connection will stay up for five minutes until dropping, but
> it *always* drops.  I'm not sure what to do here.

Weird.

Good luck!

Take care,

Bill