Testing on an NCM-MBIM composite modem.

Dan Williams dcbw at redhat.com
Mon Jun 16 09:39:43 PDT 2014

On Sat, 2014-06-14 at 13:32 +0200, Bjørn Mork wrote:
> I currently have two such modems:
> Ericsson H5321gw and Sierra Wireless EM7345
> That is, I don't know if the latter really is supported in NCM mode. It has an odd ff:ff:ff:ff:ff:ff mac address, and I haven't figured out how to make it connect in NCM mode. I can attach and connect to the network using standard at commands, but I am unable to activate the NCM data channel. At first I believed it just failed to send the expected notifications, but there is more than that missing.
> And the fact that Lenovo provides a windows 7 MBIM driver and no NCM driver, together with the obviously nonfunctional mac address, makes me think that the NCM mode might just be something they left in the USB descriptors by accident.
> The Ericsson modem works fine both as an MBIM and as an NCM device. It use the usual Ericsson mbm commands for NCM management, and is fully supported by MM in both modes.

Be prepared to buy a few of the H5321gw modems off eBay though, if
that's where you're going to get them.  Not all firmware versions use
MBIM, and the upgrade path is somewhat difficult since they don't make
them anymore, you have to find the firmware somewhere, and you  have to
flash using Windows and a laptop from the manufacturer that re-branded
the card.  So you might have to buy a few to get one with MBIM firmware


> Bjørn
> On 14 June 2014 00:37:20 CEST, Prathmesh Prabhu Chromium <pprabhu at chromium.org> wrote:
> >Hi list,
> >
> >Could you suggest some (supported?) MBIM-NCM composite modems that use
> >the
> >suggested USB descriptor scheme in the MBIM spec, i.e., the
> >Communication
> >Interface Class header has two alternate settings, and the
> >Communication
> >Data Class has three alternate settings.
> >
> >Thanks,
> >Prathmesh
> >
> >
> >------------------------------------------------------------------------
> >
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