In MEF 6 and MEF 10.1, the MEF has established what an Ethernet service is, how
a variety of subscriber services can be offered, and how these Ethernet services can be
customized for certain performance and Service-Level Agreements (SLAs).
The MEF has also defined an overall framework to discuss Ethernet services??”the
Ethernet Service Model (ESM), which identifies the building blocks or service attributes
of these services. (The Ethernet Service Model does not define the Ethernet service
itself; this is done in an Ethernet Service Definition framework explained later.)
The Ethernet Service Model (ESM) The basic Service Provider architectural model defined
by the MEF is shown in Figure 2.5. It has two main components:
?– The Subscriber or customer equipment (CE)
?– The Metro Ethernet Network (MEN) or more accurately, the Service Provider
Ethernet Network (SEN)10 This is owned/operated by a Service Provider.
Basically, the customer equipment is connected to the MEN [through a User Network
Interface (UNI) which is explained in greater detail in the next section]. Any OSI
layer 1 or 2 transport technology can be used as long as Ethernet frames are being
handed off.
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