From DSLAM to residence is not twisted pair ethernet. if that were the case, you wouldn't need a DSL modem.
Also, TPE uses 4 pairs. I only have 2 pairs of phone wires in my house.
Thirdly, TPE using Cat5 (10/100) maxes out at 100m. on cat3 (typical phone wire) it's unlikely it would do anything at the several kilometer reach of DSL.
finally, a cursory read of wikipedia will explain that DSL from DSLAM to residence (DSL Modem) is anything but twisted pair ethernet:
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en.wikipedia.org/wiki/Di ··· chnology