don't forget much of the lec's cable is cat3 cable. entrance cables feed that T1. the techs install shielded cable to the smart jack for obvious reasons and from there it is now recommended to pull in a cat5 cable or better. You could even get away with a Cat3 cable over a short distance. think about it a T1 is only 1.544 Mb/s. Cat 3 is rated for 10 Mb/s.