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1 2008

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Feasibility and challenges of DSL loop make-up identification via single-ended line tests

Neus C., Foubert W., Rolian Y., Maes J., Van Biesen L.

Metrology and Measurement Systems

2008

Vol. 15, nr 4

473-484

Digital subscriber lines (DSL) offer the possibility to deliver broadband services over the existing telephone network. Yet, before deploying DSL, the subscriber loops must be tested to see if they can support high-speed data services, and at what rate. Single-ended automatic qualification is essential to achieve low-cost deployment of DSL, since it allows loops to be qualified in bulk without human intervention at the customer's location. An even more ambitious challenge is to fully characterize the loop, i.e. to identify its composition completely (number of loop sections, length and cable type of each section). This paper discusses the feasibility and the challenges of loop make-up identification via single-ended measurements.