netdev - Re: [PATCH] USB host CDC Phonet network interface driver

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Message-Id: <200907241600.33806.remi.denis-courmont@nokia.com>
Date:	Fri, 24 Jul 2009 16:00:33 +0300
From:	"Rémi Denis-Courmont" 
	<remi.denis-courmont@...ia.com>
To:	ext Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Oliver Neukum <oliver@...kum.org>,
	Marcel Holtmann <marcel@...tmann.org>,
	ext Dan Williams <dcbw@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH] USB host CDC Phonet network interface driver

On Friday 24 July 2009 15:48:05 ext Alan Cox wrote:
> > No, I was thinking of having two full devices, a data channel and a
> > control channel for devices that really talk AT commands natively.
>
> If the hardware does it great, however for things like a 3G modem you
> have the problem that the PPP is over the AT command channel which may
> itself be multiplexed. And the muxing in question is *ugly* - sort of
> HDLC and LAP-B done wrong.

I guess he meant that AT commands could be sent out-of-band, for those USB 
modems that fully implement the ACM profile of CDC, if any.

-- 
Rémi Denis-Courmont
Nokia Devices R&D, Maemo Software, Helsinki

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