those mPCIe 3G modems that I tried, are all visible as USB devices, with serial (ttyUSB) and (when supported) Ethernet devices associated with them. So, in theory, the audio signal would also be available in the same way as with the USB dongle... but so far, I haven't seen such a device yet. On Sun, Jun 5, 2016 at 4:40 PM, Giovanni Maruzzelli <gmaruzz@gmail.com> wrote:
Ciao Stanislav,
the whole idea of gsmopen is to use cheap and ready available radio interfaces, that maybe you can get off ebay or surplus.
Also, they are undistinguishable from "normally used" dongles, and that is a plus in a lot of countries.
I don't know about pci modems that exposes an audio interface to the operating system.
Some soldering and demuxing will be probably needed.
But at that point, I would go with Samgoma or Khomp cards...
Also because for doing it well, a lot of engineering details are involved, from shielding to low pass filtering, to magnetic interferences, etc
Anyway, I like those things too! :)
-giovanni
sent from mobile cell: +39 347 266 56 18 Giovanni Maruzzelli OpenTelecom.IT
Il 05/Giu/2016 16:06, "Stanislav Sinyagin" <ssinyagin@gmail.com> ha scritto:
does anyone know a GSM/UMTS/LTE modem that has mini-PCIe interface and is able to deliver voice signal that can be passed to mod_gsmopen?
The only one that has any kind of voice signal that I found, is Huawei MU609 and the like. But they deliver PCM voice as a raw signal on mini-PCIe pins which are marked as "reserved" in the interface specifications, so normally the boards don't have any wiring for those pins.
I just don't like the idea of an USB dongle, and there are many hardware platforms with mini-PCIe interfaces. They work perfectly for mobile data, but I couldn't find any option for voice.
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