Unbundled Dsl Evolution (088)

Unbundling presumptions of DSL standards groups are reviewed and contrasted with their respective counterparts in cable broadband access. This comparison evaluates the ultimate DSL network architecture under those presumptions as fiber penetrates further into the existing loop plant. The results of the evaluation then raise questions as to the future emphasis and focus of advanced DSL spectrum management. __________________________________________________________________________________ NOTICE This contribution has been prepared to assist Standards Committee T1 Telecommunications. This document is offered to the Committee as a basis for discussion and is not a binding on any of the companies listed as authors. The requirements are subject to change after further study. The authors specifically reserve the right to add to, amend, or withdraw the statements contained herein. 02/15/01 2 T1E1.4/2001-088 Unbundled DSL Evolution (088) J. Cioffi Department of Electrical Engineering Stanford University, Stanford, CA 94305 Phone: 650-723-2525 Fax: 650-724-3652 Abstract: Unbundling presumptions of DSL standards groups are reviewed and contrasted with their respective counterparts in cable broadband access. This comparison evaluates the ultimate DSL network architecture under those presumptions as fiber penetrates further into the existing loop plant. The results of the evaluation then raise questions as to the future emphasis and focus of advanced DSL spectrum management. Unbundling presumptions of DSL standards groups are reviewed and contrasted with their respective counterparts in cable broadband access. This comparison evaluates the ultimate DSL network architecture under those presumptions as fiber penetrates further into the existing loop plant. The results of the evaluation then raise questions as to the future emphasis and focus of advanced DSL spectrum management.