R interface or R reference point defines the point between a non-
ISDN
Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the digitalised circuits of the public switched telephone network. Wor ...
device and a terminal adapter (TA) which provides translation to and from such a device.
See also
*
S interface
*
T interface
*
U interface
References
*
ITU-T recommendations
Integrated Services Digital Network
{{Telecomm-stub