Ethernet over SONET/SDH

Many incumbent carriers in the U.S. and Europe have already spent billions of dollars building SONET/SDH metro infrastructures. These carriers would like to leverage the existing infrastructure to deliver next-generation Ethernet services. For such deployments, bandwidth management on the network is essential, because of the low capacity of existing SONET/SDH rings and the fact that they can be easily oversubscribed when used for data services.

Incumbents who want to deploy EOS services face tough challenges. Traditionally, for RBOCs and ILECs in the U.S., there is a clear-cut delineation between transport and data. The regulated part of the organization deals with transport-only equipment, not data equipment. With EOS, ...

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