Martin Hotze wrote:

"G.R. Patterson III" wrote:

I have never heard of a subscriber DSL line that
requires 4 wires, though some other types of digital lines do.

you can use 2 copper pairs and make that a 4 mbit/s (4.6, to be correct)
G.HDSL connection (up and down the same). you can bond up to 4 pairs
together for a 9.6 mbit/s DSL line (or you use 1 pair for up to 8 mbit
down and up to 1 mbit up).

Correct, but those are not normally considered to be subscriber DSL services.
Those are sold as business services.

George Patterson
Brute force has an elegance all its own.