DCE Express now offers 2 solutions for extending a T1 demarc over copper.
The first solution is our own DCE-CopperT T1 Extender. This 4-wire T1 Extender is shown below:

Copper-T T1 Extender
These devices use repeater technology to extend a T1 Demarc to distances up to 5,000 feet.
The second solution we offer requires only 2 wires (a single twisted pair) to extend a T1 circuit. This innovative 2-wire solution from Patton Electronics extends 4-wire T1 circuits by converting T1 signalling for transport over DSL. Then a unit at the far end converts the DSL signalling back to T1.
The advantages of this solution is that…
(a) They work to greater distances (up to 3 miles) and
(b) They use less copper infrastructure…just a single twisted pair.
The Patton 2115 T1 Extenders, are shown below:

Patton 2115 T1 Extender
We are the only solution provider we know of that offers our customers a choice of T1 Extender technologies. You can chose from the industry standard repeater approach, or the innovative DSL approach. And our prices are always discounted.
Feel free to browse our T1 Extender pages, or call 610-399-3911 for more information. We are happy to answer your questions.