From owner-freebsd-hackers  Sun Jan 11 18:48:39 1998
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	Mon, 12 Jan 1998 02:47:43 GMT
Date: Mon, 12 Jan 1998 02:47:42 +0000 (GMT)
From: Andrew Gordon <arg@arg1.demon.co.uk>
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To: "Donald J. Maddox" <dmaddox@scsn.net>
cc: hackers@FreeBSD.ORG
Subject: Re: ISDN TAs (was: 16650 Support(?))
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On Sun, 11 Jan 1998, Donald J. Maddox wrote:
> 
> The AT command to use both B channels is 'AT@B0=2' on the BitSURFR; however,
> it has 3 different rate adaption protocols: V.120, AIMux, and PPP.  If I
> use V.120, everything works great, but, unfortunately, V.120 does not support
> channel bonding.  If I use PPP (which _does_ support channel bonding, and
> which works great under W95 dial-up networking), the modem connects fine,
> but instead of a login prompt, I just get garbage characters from the
> modem.  I know the problem is something simple that I am just not quite

You're not supposed to get a login prompt!  If using PPP mode, you have 
to do authentication inside the PPP protocol (typically using PAP).
Your "garbage characters" are almost certainly valid PPP protocol.