Having a dedicated pair to use for DSL doesn't mean that a new wire must be placed. If there is extra pairs available in the existing wire then they can be used. A step-by-step post with pictures can be seen here:

Apartment Install

This method uses a filter placed outside and makes use of one of the extra pairs in the existing wire.
(This method would require a telco/clec technician and is not meant for the general user)
Originally submitted by ADSL Guy.

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by Ranma edited by MrFixitCT