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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

* S interface * T interface *
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

* ITU-T recommendations Integrated Services Digital Network {{Telecomm-stub