The economic analysis in
???Economic Assessment,??? later in the chapter, will illustrate this further.
Shortcomings
EoS solutions can result in higher service deployment costs when the network architecture
mandates that the transport network support a high degree or density of Ethernet
switching functionality and when the conditions described in the benefits section (e.g.,
a mixture of Carrier Ethernet and traditional TDM services and an existing SONET
network) do not apply.5 Determining when all these criteria apply can be difficult to
quantify; in some cases, the nature of the Ethernet service and the profile and distribution
of its subscribers call for a high degree of switching content in the optical transport
network; just as often, perhaps, this architectural decision is driven by history??”by
previous service delivery architectures and vendor selections.
When the transport network must support a high degree of Ethernet switching functionality,
EoS solutions tend to cost more for two reasons. First, existing MSPP solutions
often have advanced Ethernet functions, but typically not at the cost points and
service densities of other technology solutions.
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