As such, the UNI-C includes functions associated with the Ethernet services infrastructure,
the transport network infrastructure, and if present, application-specific
components.
UNI Network (UNI-N) The UNI-N represents all of the functions required to connect
a MEN to a MEN subscriber. The individual functions in a UNI-N are entirely in
the Service Provider/Network Operator domain. From the perspective of the subscriber,
the UNI-N supports the set of functions required to exchange data, control, and management
plane information with the MEN. As such, the UNI-N includes functions associated
with the Ethernet services infrastructure, the transport network infrastructure,
and if present, application-specific components.
The MEF has defined a set of attributes to specify a UNI completely. These are listed
at the end of the chapter (Figure 2.24).
Ethernet Virtual Connection (EVC) The Ethernet Virtual Connection (EVC) is a construct
that performs two functions: One, it indicates the association of two or more UNIs for
the purpose of delivering an Ethernet flow11 between subscriber sites across the MEN.
Two, an EVC prevents data transfers between subscriber sites that are not part of the
11 An Ethernet flow represents a particular and potentially noncontiguous (e.
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