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

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Message-ID: <20090724134805.0d9496be@lxorguk.ukuu.org.uk>
Date:	Fri, 24 Jul 2009 13:48:05 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	"Rémi Denis-Courmont" 
	<remi.denis-courmont@...ia.com>,
	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

> 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.

Alan
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