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Osmocom GSM/GPRS/EGPRS transceiver, originally forked from OpenBTS transceiver. For building SDR based GSM BTS with osmo-bts-trx.
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Timur Davydov 7923e26181 transceiver: replace sprintf() with snprintf() in ctrl_sock_handle_rx 
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Transceiver52M transceiver: replace sprintf() with snprintf() in ctrl_sock_handle_rx 2026-03-17 15:00:45 +04:00
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README.md

About OsmoTRX

OsmoTRX is a software-defined radio transceiver that implements the Layer 1 physical layer of a BTS comprising the following 3GPP specifications:

  • TS 05.01 Physical layer on the radio path
  • TS 05.02 Multiplexing and Multiple Access on the Radio Path
  • TS 05.04 Modulation
  • TS 05.10 Radio subsystem synchronization

OsmoTRX is originally based on the transceiver code from the OpenBTS project, but setup to operate independently with the purpose of using with non-OpenBTS software and projects, specifically within the Osmocom stack. Used together with OsmoBTS you can get a pretty standard GSM/GPRS/EGPRS BTS with Abis interface as per the relevant 3GPP specifications.

Homepage

The official homepage of the project is https://osmocom.org/projects/osmotrx/wiki/OsmoTRX

GIT Repository

You can clone from the official osmo-trx.git repository using

    git clone https://gitea.osmocom.org/cellular-infrastructure/osmo-trx

There is a web interface at https://gitea.osmocom.org/cellular-infrastructure/osmo-trx

Documentation

Doxygen-generated API documentation is generated during the build process, but also available online for each of the sub-libraries at User Manual for OsmoTRX can be generated during the build process, and is also available online at https://ftp.osmocom.org/docs/latest/osmotrx-usermanual.pdf.

Forum

We welcome any osmo-trx related discussions in the Cellular Network Infrastructure -> 2 RAN (GERAN) section of the osmocom discourse (web based Forum).

Mailing List

Discussions related to OsmoTRX are happening on the openbsc@lists.osmocom.org mailing list, please see https://lists.osmocom.org/mailman/listinfo/openbsc for subscription options and the list archive.

Please observe the Osmocom Mailing List Rules when posting.

Issue Tracker

We use the issue tracker of the osmo-trx project on osmocom.org for tracking the state of bug reports and feature requests. Feel free to submit any issues you may find, or help us out by resolving existing issues.

Contributing

Our coding standards are described at https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards

We use a Gerrit based patch submission/review process for managing contributions. Please see https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit for more details

The current patch queue for OsmoTRX can be seen at https://gerrit.osmocom.org/q/project:osmo-trx+status:open