To which terminals do you connect a phone jack?
L1, L2 cross-references to TIP and RING respectively per standard US phone nomenclature. TX/TS can be wired as the second line TIP2/TX, RING2/TS or a sort of daisy chain, but in a single line system, can be ignored.



Wiring on this will be


Green => Tip => L1
Red => Ring => L2


This pair will connect to the center pair of contacts in the modular socket/jack. Most phone wall cords sold are RJ-11 with a single pair to save money.

What the phone company has given you is a standard T-568A (Cat 4 or 5) color coded single pair. If you examine it closely, one wire's insulation will be white with blue stripe and the other will be solid blue.

It cross-references to the old RING/L1, TIP/L2 wiring convention as follows:


White/Blue => Green => Tip => L1
Blue => Red => Ring => L2


RJ Modular wiring:


RJ-11 Single Pair
RJ-14 Two Pair
RJ-25 Three Pair


POTS Local Loop voltages (positive ground to reduce electrolytic corrosion):


Tip is at ground potential
Ring is -48V DC (nominal)