Thus, it is anticipated that these voice-optimized solutions will exist
in the foreseeable future.
Quite a few Service Providers also invested in new ATM and Frame Relay (often
overlaid over fiber infrastructure and voice oriented transport platforms like SONET)
networks to support data services exclusively. Of course, newer (green field) Service
Providers that did not have to face the constraints of legacy infrastructures have already
implemented transport networks that are more data and packet optimized.
The net result is that there are multiple solutions that can be employed to deliver
Carrier Ethernet over Service Provider networks, each with its own specific genesis
and focus, and consequently, different in how the Carrier Ethernet solution is offered.
Some of these solutions are better suited than others in particular contexts. It is also
not uncommon to have more than a single (delivery) solution deployed in a Service
Provider network because of both legacy and practical considerations.
Understanding these different network solutions, their fit and limitations, is an extremely
useful exercise to both Service Providers as well as end-user enterprises; after
all, these solutions underpin the Ethernet services delivered or used, respectively.
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