Re: [Mbm-devel] Modem-/NetworkManager support for modems not using PPP

Den 18. april 2011 09:24, skrev Torgny Johansson:
Hi Marius!

On Sat, Apr 16, 2011 at 2:57 PM, Marius Kotsbak
<marius kotsbak gmail com>  wrote:

There seems to be now quite a bit of modems appearing now that does not
support the old method of using PPP protocol on the same tty device as
the AT commands are sent, or it is not recommended for higher HSPA+ and
LTE modems because of performance limitations of the PPP/tty layer.
Those devices typically accept AT commands at one interface and use
another interface for the network traffic (including first a DHCP query).

One example is the Samsung GT-B3730 I'm currently developing drivers for:

It seems to be the same case for LG VL600 4G (LTE):

The Ericsson Mobile Broadband Modules (I have an F5521gw based modem)
seems to offer both the old ACM ports and support USB WCM / CDC NCM /
CDC Ethernet protocols for higher performance:

I wonder if support for this has been implemented or thought about in
Modem-/NetworkManager. We probably need a flag for a modem manager
module to tell that it does not use PPP and require to get IP address
using DHCP instead.
Yes, support for using the cdc_ncm interface in ModemManger is already
available. The same goes for the older ericsson modules using the
cdc_ether interface. No need for PPP anymore.

Ah ok. Will look at that module and see if I can make a similar module for my LTE modem. When I looked at the NM code it seemed it always do PPP. Strange since it probably affect the communication out of the modem to the network operator, but they might support both PPP and ethernet/DHCP in the other end.


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