UNI

user-network interface

UNI is an interface point between ATM end users and a private ATM switch, or between a private ATM switch and the public carrier ATM network. The physical and protocol specifications of the ATM Forum UNI documents define the standard for a connection between end stations and a local ATM network switch.

A switch UNI is a port that resides on a PE bridge and that connects to a customer network and carries customer traffic. The UNI may consist of a single port or a group of ports, and can accept tagged or untagged traffic.