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. ...
device and a terminal adapter (TA) which provides translation to and from such a device.
See also
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S interface
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T interface
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U interface
The U interface or U reference point is a Basic Rate Interface (BRI) in the local loop of an Integrated Services Digital Network (ISDN), connecting the network terminator (NT1/2) on the customer's premises to the line termination (LT) in the car ...
References
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ITU-T recommendations
Integrated Services Digital Network
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