AT&T ML17959 - Manual (Page 15)

Getting started
10
Plug the coiled handset cord into the handset and the telephone base.
Plug the small end of the power adapter cord into the power jack on the
back of the telephone base.
Plug the telephone line cords into the wall jacks.
option 1: If you have a single two-line wall jack, use only the black
telephone line cord (4-conductor).
Plug one end of the black telephone line cord into the jack labeled
LINE 1/L1+L2 on the back of the telephone base. Plug the large end of the
power adapter into an electrical outlet not controlled by a wall switch.
3.
4.
option 2: If you have two separate one-line wall jacks, use both telephone
line cords.
Plug one end of the clear telephone line cord into the jack labeled
LINE 1/L1+L2 on the back of the telephone base. Plug one end of the
black telephone line cord into the jack labeled
LINE 2. Plug the other end
of the clear telephone line cord and the other end of the black telephone
line cord into the wall jacks.
Installation options
L1 L2
L1+L2
If you have DSL high
speed Internet service,
a DSL filter (not
included) is required.
If you have DSL high speed
Internet service, a DSL filter
(not included) is required.