[[trx_backends]]
== OsmoTRX backend support

[[backend_uhd]]
=== `osmo-trx-uhd` for UHD based Transceivers

This OsmoTRX model uses _libuhd_ (UHD, USRP Hardware Driver) to drive the
device, that is configuring it and reading/writing samples from/to it.

So far, this backend has been mostly used to drive devices such as the Ettus
B200 family and Fairwaves UmTRX family, and used to be the default backend used
for legacy @osmo-trx@ binary when per-backend binaries didn't exist yet.

Any device providing generic support for UHD should theoretically be able to be
run through this backend without much effort, but pracitcal experience showed
that some devices don't play well with it, such as the LimeSDR family of
devices, which showed far better results when using its native interface.

Related code can be found in the _Transceiver52M/device/uhd/_ directory in
_osmo-trx.git_.

[[backend_lms]]
=== `osmo-trx-lms` for LimeSuite based Transceivers

This OsmoTRX model uses LimeSuite API and library to drive the device, that is
configuring it and reading/writing samples from/to it.

This backend was developed in order to be used together with LimeSDR-USB and
LimeSDR-mini devices, due to to the poor results obtained with the UHD backend,
and to simplify the stack.

Related code can be found in the _Transceiver52M/device/lms/_ directory in
_osmo-trx.git_.

[[backend_usrp1]]
=== `osmo-trx-usrp1` for libusrp based Transceivers

This OsmoTRX model uses the legacy libusrp driver provided in GNU Radio 3.4.2.

As this code was dropped from GNU Radio at some point and was found very
difficult to build, some work was done to create a standalone libusrp which can
be nowadays found as a separate git repository together with other osmocom git
repositories, in https://git.osmocom.org/libusrp/

Related code can be found in the _Transceiver52M/device/usrp1/_ directory in
_osmo-trx.git_.