From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oliver Neukum Subject: Re: [PATCH] USB host CDC Phonet network interface driver Date: Fri, 24 Jul 2009 16:12:41 +0200 Message-ID: <200907241612.41871.oliver@neukum.org> References: <1248177515-12712-1-git-send-email-remi.denis-courmont@nokia.com> <200907241431.08858.oliver@neukum.org> <20090724134805.0d9496be@lxorguk.ukuu.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Cc: "=?iso-8859-1?q?R=E9mi?= Denis-Courmont" , Marcel Holtmann , ext Dan Williams , "netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" To: Alan Cox Return-path: In-Reply-To: <20090724134805.0d9496be-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org> Content-Disposition: inline Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: netdev.vger.kernel.org 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. Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html