2 to 4 wire configuration of telephone?

Question

2 to 4 wire configuration of telephone?

Answer 1

red-green are used for the phone line whether u have dsl or not, data and voice are sent on the same pair of wires u don't need an additional pair for dsl. The other 2 colors (yellow-black) are used for a second phone line.Visit the following site, it has useful information about phone lines..

http://www.fix-your-phone-line.com

Answer 2

Two telephone lines....one for you and one for your spouse....or business.

Other than that, it was never fully implemented like the phone company had planned in  the 50's.....

DSL uses the SAME line as Voice...it's just filtered for voice

Answer 3

? 2 wires is generally phone, 4 wires has data which is required for DSL.