Serial Port Names

Linux PPP HOWTO
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# 12.2. Serial Port Names

Historically, Linux used `cuaX` devices for dial-out and `ttySx` devices for dial-in.

The kernel code that required this was changed in kernel version 2.0.x and you should now use `ttySx` for both dial in and dial out. I understand that the `cuaX` device names may well disappear in future kernel versions.

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