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Date: Fri, 24 Jul 2009 15:19:41 +0100 From: Alan Cox <alan@...rguk.ukuu.org.uk> To: Oliver Neukum <oliver@...kum.org> Cc: "RĂ©mi 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 On Fri, 24 Jul 2009 16:12:41 +0200 Oliver Neukum <oliver@...kum.org> wrote: > Am Freitag, 24. Juli 2009 14:48:05 schrieb Alan Cox: > > > 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. > > Well, yes, but we would really like a separate control channel, so we > can query parameters like signal strength, while we do PPP over the data > channel. Thats the notion of the AT mux stuff - you get multiple AT channels and you can stuff PPP down one of them. It's still butt ugly. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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