A number of technologies are available today to carry Ethernet frames over xDSL lines, point-to-point radio links, PDH, SDH/Sonet and obviously fiber. Ethernet's ubiquity is one of the highlighted reasons for its success. A large number of service providers worldwide plan to upgrade, extend or exchange their metro aggregation networks in the near future. Increased requirements for scalability and coverage, range of Ethernet services offered and competitive pricing force carriers to search for new solutions for their metro business services, residential triple play offerings and inter-carrier services.
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