Summary649broadcast network with dedicated bandwidth and eventually to a switched networkwith dedicated bandwidth.SummaryService providers, both telephone operators and cable companies, are actively look-ing to deploy broadband access networks to provide a variety of new services. Fiber-based services are now available for many businesses in metropolitan areas. Whenit comes to residential access, however, fiber is yet to reach the home. SONET/SDHring-based architectures have been deployed to support the needs of large businesscustomers, but they are not as suited for supporting the needs of residential users andsmall business customers. The two main architectures for broadband access networksare the hybrid fiber coax (HFC) architecture, which is based on evolving the currentplant deployed by cable television operators, and the fiber to the curb (FTTC) archi-tecture, or equivalently a passive optical network (PON) architecture. Compared to
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