48 Chapter 2
Figure 2.1 Attributes of Carrier Ethernet (Source: MEF)
Service
Management Reliability
Standardized
Services
Quality of
Service
Scalability
Carrier
Ethernet
Figure 2.2 Carrier Ethernet spanning Access, Metro, and Wide Area Networks (Source: MEF)
Global/National
Carrier
Ethernet
Metro
Carrier
Ethernet
Access
Carrier
Ethernet
Ethernet Services ???Eth??? Layer
Video
UNI
Service Provider 1
Metro Ethernet
Network
Service Provider 2
Metro Ethernet
Network
E-NNI UNI
Internet
Subscriber
Site
Subscriber
Site
Subscriber
Site
Subscriber
Site
Carrier Ethernet 49
the Service Provider network and between Service Providers (or Network Operators4),
whose infrastructure is used to deliver the service, respectively, and are explained in
more detail later in this chapter.
The Ethernet frame(s) may be transported as is, either natively and directly over a
physical media or encapsulated and delivered over a variety of overlay networks built
using different technologies. Each of these very different networking technology solutions,
however, delivers5 Carrier Ethernet services. It is critical to understand that the
Carrier Ethernet attributes often manifest only partially in commercial solutions today
because they exist at the network/transport/physical layers as opposed to the service
layer6.
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