# R interface

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**R interface** or **R reference point** defines the point between a non-[ISDN](/source/Integrated_Services_Digital_Network) device and a terminal adapter (TA) which provides translation to and from such a device.

## See also

- [S interface](/source/S_interface)

- [T interface](/source/T_interface)

- [U interface](/source/U_interface)

## References

- This article incorporates [public domain material](/source/Copyright_status_of_works_by_the_federal_government_of_the_United_States) from [*Federal Standard 1037C*](https://web.archive.org/web/20220122224547/https://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm). [General Services Administration](/source/General_Services_Administration). Archived from [the original](https://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm) on 2022-01-22.

This article related to telecommunications infrastructure is a stub. You can help Wikipedia by adding missing information.

- [v](https://en.wikipedia.org/wiki/Template:Telecomm-infrastructure-stub)
- [t](/source/Template_talk%3ATelecomm-infrastructure-stub)
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Adapted from the Wikipedia article [R interface](https://en.wikipedia.org/wiki/R_interface) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/R_interface?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.