Tech Support > Computer Hardware > Modems > Multiple modems and AT commands
Multiple modems and AT commands
Posted by jardar.maatje@gmail.com on May 5th, 2006


I am in a situation where we might have two modems connected to each
other. Since all modems have the same way of exiting transparent mode
("+++") how could I make the second modem exit transparent mode?
One way of doing this would be to modify the exit sequence to something
else, but is there another way?

Best regards

JM

Posted by R.L. Horn on May 6th, 2006


On 5 May 2006 07:48:08 -0700, jardar.maatje@gmail.com
<jardar.maatje@gmail.com> wrote:

Could you be more specific? If the idea is to connect two serial modems
back-to-back (or some equivalent setup), the simplest thing is just to
change the exit sequence to something else. "---" is common. Granted, this
might cause problems with the local software, but no more than you have to
work around anyway, what with the control lines and all.

If you'll be running PPP, a better solution would probably be to set up a
cheap linux box as a gateway (you could do this with anything from an old
386 up). That would allow firewalling, NAT routing, etc.

Or maybe I've misunderstood entirely...



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