Osmocom GTM-900B carrier board

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Harald Welte laforge at osmocom.org
Tue Apr 28 16:12:53 UTC 2020

Hi all!

It is quite some time since it was brought to our attention that there's
an old Huawei module that also uses the Ti Calypso chipset and hence
can be used with OsmocomBB: The GTM-900B.

It's just a modem module with a FPC connector, so no easy to use interfaces
for any of the related signals, no SIM holder, etc.

At sysmocom we've finally found some time to do a carrier board design for this,
which will expose all the relevant signals (audio, UARTs, power, reset, ...).

Martin (Cc) is working on it right now.

The discussion regarding this breakout board can be followed at

If you have any input, please provide it now, as we are trying to complete this design
by the end of the week so we can order prottoypes.

The actual design files (EAGLE) including a PDF export of the schematics can
be found in the osmo-small-hardware.git repository.

Thanks for your input.

Once the prototype is validated, we plan to make the boards (bundled with GTM900B)
available in the sysmocom webshop.

- Harald Welte <laforge at osmocom.org>            http://laforge.gnumonks.org/
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)

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