The term User Network Interface (UNI) can be defined as a physical demarcation edge between the responsibility of the service provider and the responsibility of the service subscriber. It is quite different from the Network to Network Interface (NNI) which defines a similar interface between provider networks. The network which provides the Ethernet services is known as Carrier Ethernet Network (CEN). In telecommunications, a User Network Interface is a point between ATM end users and a private ATM switch. It can also represent the interface between a private ATM switch and the public carrier ATM network.
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