Re: Homer has the ppp blues :-(
Mark Phillips wrote:
>
> On Wed, 16 Apr 1997, Rick wrote:
>
> > You might want to play with DTR/DCD settings. I haven't had a problem
> > like this before but it sounds like the modem is dropping DTR which, if I
> > remember correctly, instructs the software that the data terminal is
> > ready. I believe there is a modem command that sets DTR on permanently.
> >
I had a LOT of trouble with this - the command isn't standard, each Mfg.
uses whatever. You need to hold DTR high between the time the chat
script (whatever one you use) terminates and pppd takes over. As I
recall, my magic string is S1 (but don't quote me) YMWPV.
> > Or maybe the Data Carrier Detect is dropping. But I'm pretty sure that
> > would cause the modem to really hang up. It's been a while since I've
> > messed with modem settings. Look in your modem manual for a setting that
> > is used for informing the software of the modems status.
> >
> > AT&C1&D2 is the init string that used to be the fix all for me. It sets
> > the DTR/DCD to the correct setting for data, such as ppp or bbsing. A few
> > years ago manufacturers started to set factory defaults toward faxing
> > which conflicts with data. AT&C1&D2 fixes this. Try it and see. Give
> > you a starting point to add compression and error correction etc...
>
> Unfortunately my modem didn't come with a manual telling me these details.
> (I think I could send off for one which would cost me $30 - a little
> expensive I think.) Do you know what these things mean/do? Ie what are
> DTR/DCD settings? What does AT&C1&D2 mean and do? Is there any document
> on the net explaining basic modem commands and basically how a modem
> works. I really don't have a clear picture at the moment.
>
> Thanks.
>
> -----------------------------------------------------------------------------
> Mark Phillips mark@maths.flinders.edu.au
> "They told me I was gullible ... and I believed them!"
> -----------------------------------------------------------------------------
>
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