Carrier Ethernet 97
the Service Provider network (such as T1, DS-3, OC-3, OC-12, etc); thus, the Ethernet
handoff is ???converted??? to whatever the last mile transport technology is.26 What this
means is that now a standardized Carrier Ethernet handoff can be provided to a customer
independent of the last mile infrastructure.
Figure 2.22 depicts the use of Ethernet demarcation in a real-life scenario. In this example,
a reasonably large enterprise customer with several physical locations, each of
which are served by different last/first mile infrastructures, requires Carrier Ethernet
services. Some of the locations are served by old SONET ADMs that have no Ethernet
capability. By introducing Ethernet demarcation, such issues are addressed and the
customer is provided a standardized Ethernet UNI, with the same look and feel at all
locations.
Thus, Ethernet demarcation is enabling the delivery of Carrier Ethernet services despite
the challenges of fiber shortage and the presence of a host of last mile infrastructures
that may not always be amenable to delivery of such services (e.g., older SONET
ADMs are usually not equipped with Ethernet interfaces).
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