AT&T SB67138 - Manual (Page 13)

Getting started
Telephone base installation
To connect the telephone line cords to the telephone base
If you subscribe to high-speed Internet service (DSL - digital subscriber line)
through your telephone lines, you must install a DSL filter between each
telephone line cord and telephone wall jack. The filter prevents noise and
caller ID problems caused by DSL interference. Please contact your DSL
service provider for more information about DSL filters.
Install the telephone line cords as shown below:
7
L3/L4 L1/L2
Option 1: To connect two 2-line wall jacks
Line 1 + Line 2 Line 3 + Line 4
Electrical outlet
not controlled
by a wall switch
Power adapter
Telephone
line cords
If you have DSL
high-speed Internet
service, a DSL filter
(not included) is
required on each
DSL line.
L3/L4 L1/L2