5, Ethernet services are delivered over
an EVC provided by a Service Provider over a MEN, which is connected to the customer
equipment (CE) via a standardized UNI. Thus, all Ethernet services will invariably
have associated with them, one or more UNIs and one or more EVCs. The specific UNI
and EVC attributes differentiate the specific services.
12 Virtual Private Network (VPN) is a connectivity service between multiple points to multiple points.
Carrier Ethernet 61
Carrier Ethernet services are defined from a subscriber perspective (and hence
they??™re also referred to as ???retail services???). As shown in Figure 2.6, the MEF has developed
an Ethernet Services Definition Framework that defines any Carrier Ethernet
service in terms of a predefined Ethernet service type. Each of these Ethernet service
types (described next) are, in turn, defined by a set of Ethernet service attributes that
define its capabilities. Some of these attributes apply to the UNI, others to the EVCs,
and still others to both the UNI and EVCs associated with the service type. Specific
parameters associated with each of these Ethernet service attributes ultimately define
the Ethernet service fully.
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