> Umm, if it's synchronous, you don't really want to be a TTY.
> You want to be a network / WAN / whatever interface.
>
> Sync lines are running a packetized protocol like HDLC or whatever.
> It carries packet boundaries which you may not toss. There' _no_ way
> to convey those boundaries through the TTY layers, unless you
> transcribe the stuff into async HDLC, only to let the PPP driver do
> the reverse operation -- millisecond later. Not a pretty thought.
>
> However, the PPP driver needs ripping apart anyway, and you're not
> the first person to stumble across this (ISDN is another example).
Something to keep in mind:
What about modems? Buried somewhere in that PC99 document, you can
see that future modems will expose a sync interface so that we can
do sync PPP. (current modems are actually sync, but give us async)
This throws the whole "just a serial port" idea out the window.
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