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Greater flexibility The need is for interoperability with existing equipment (backward compatibility) at all locations—the CO, POP, and the customer premises. In addition, the ability to deliver bandwidth by the slice (1 Mb increments) enables service providers to offer competitive and custom services tailored to meet the needs of an increasingly demanding and savvy customer base. ■ Low cost The expectation of the new MAN infrastructure is a cost model that is less than SONET/SDH. This is not limited to equipment acquisition costs only.

From the copper-loop connections between users and their COs to the uniform TDM infrastructures across the metro and wide area, all aspects of the traditional Public Switched Telephone Network (PSTN) were designed for connection-oriented voice traffic rather than connectionless data traffic. As data has become the dominant traffic type—and it has—a driving need has arisen for the seamless convergence of data, toll-quality voice, and broadcast-quality video within a mutually optimized network. Key: In 2000, several Regional Bell Operating Companies (RBOCs) reported that the volume of data traffic on their networks actually exceeded voice traffic volumes.

Another architectural advantage of Ethernet is its emerging potential to serve as a true end-to-end solution. Existing customer networks can be supported in native mode, eliminating data format conversions at the network boundaries. This removes some of the network processing that would be needed when different data link protocols are used; therefore, it reduces network complexity. Ethernet is a scalable solution. The IEEE standards currently specify Ethernet at 10 Mb/100 Mb, 1 Gb, and now 10 Gb (June 2002).

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