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U interface: For basic-rate access in an Integrated Services Digital Network (ISDN) environment, a user-to-network interface reference point that is characterized by the use of a 2-wire-loop transmission system that
- conveys information between the 4-wire user-to-network interface, i.e., the S/T reference point, and the local exchange,
- is located in the servicing central office, and
- is not as distance sensitive as a service using a T interface.
- This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".