e., ITU-compliant.
516 Chapter 16
Scenario 4
In this case, a Service Provider with a different access infrastructure (SONET, TDM,
fiber, copper) at different locations within its footprint is serving a medium-sized
enterprise with offices at each of these locations and a couple outside.
Requiring a standardized (and consistent) Ethernet service across these customer
locations (albeit with the bandwidth varying between 10 and 100M) is an increasingly
common scenario. The Service Provider may consider introducing a simple Ethernet
Demarcation Device (EDD)??”based solution (see Chapter 2 for some details on EDD)
with the corresponding network links (OC-n, T1, Ethernet-over fiber/copper). This is
shown in Figure 16.4 and provides a cost-effective solution that enables offering a
standardized Ethernet handoff rapidly, irrespective of the last/first mile infrastructure
and without disrupting this infrastructure. By employing an EDD, it can also extend
this standardized offering over the leased facility (from another operator) to support
out-of-region customer locations.
These fairly straightforward scenarios depict that often more than a single solution is
feasible in a particular environment and also that multiple solutions frequently coexist
in the same Service Provider network.
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