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I was wondering if it's possible to connect to a friend using a DSL modem. I know that with voice-band modems, you can dial numbers and have a peer's computer answer the call and communicate with yours to send files etc, but this is slow. Is it possible to communicate with a peer's computer, WITHOUT using any ISPs using the DSL interface?

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No. The DSL modem must connect with a DSLAM on the other end of the loop.

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BBSes used to run mainly on POTS, not DSL. If you need multiple people connect to your system, setup a relevant server so that people can connect to it @phillid –  Sathya Nov 7 '11 at 5:21
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No. The best you can do is set up a PRI or BRI, then use hunting to make all the lines look like they're on the same number. –  Ignacio Vazquez-Abrams Nov 7 '11 at 5:31
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You're looking for pppd, in server mode. –  Ignacio Vazquez-Abrams Nov 7 '11 at 5:38
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Not with only a single line, no. But that's a POTS limitation. –  Ignacio Vazquez-Abrams Nov 7 '11 at 5:47
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It's actually /10, since there is 1 start bit and 1 stop bit on top of the 8 data bits. –  Ignacio Vazquez-Abrams Nov 7 '11 at 6:52
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