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User-Network Interface
An ATM
Forum specification that defines an interoperability standard for the interface
between Asynchronous Transfer Mode (ATM)-based products (a router or an ATM
switch) located in a private network and the ATM switches located within the
public carrier networks. This is also used to describe similar connections in
Frame Relay networks. See also NNI, Q.920/Q.921 and Subscriber
Network Interface (SNI).
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