User-Network Interface (UNI) The UNI is the interface used to interconnect a subscriber
to an Ethernet Service Provider. The UNI also provides a reference point for demarcation
between the MEN operator??™s (i.e., a Service Provider??™s) equipment that enables access
to the MEN services and the subscriber access equipment. The demarcation point
indicates the location where the responsibility of the Service Provider ends and where
the responsibility of the subscriber begins. The UNI is a key Ethernet service attribute
used to specify an Ethernet service.
Functionally, the UNI is an asymmetric, compound functional element that consists
of a client side, referred to as the UNI-C, and a network side, referred to as the UNI-N.
Thus, the term UNI is used to refer to these two functional elements and generically, to
the data, management, and control plane functions associated with them.
UNI Client (UNI-C) The UNI-C represents all of the functions required to connect
a subscriber to a MEN. Individual functions in a UNI-C are entirely in the subscriber
domain, and may or may not be managed by the Service Provider/Network Operator.
From the perspective of the MEN, the UNI-C supports the set of functions required to
exchange data, control, and management plane information with the MEN subscriber.
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