Although a great deal of the digital subscriber line (DSL) services added to the network are provisioned from the central office (CO), as the penetration of DSL deployments continues to rise, coinciding with growing demand for additional local-loop bandwidth, the growth in DSL will force providers to serve ever-increasing numbers of customers through digital loop carrier (DLC) architectures. It is important that our industry develop and evolve techniques and standards which support the growth in these DSL services over both DLC and CO-served architectures. Growth in DLC deployments demands alternatives to CO-based digital subscriber loop access multiplexors (DSLAMs) are needed, particularly alternatives which embrace or enable fiber-fed DLC architectures.
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