AT&T ATT 993 - Manual (Page 14)

Getting started
Connect the handset to the telephone.
Plug the coiled handset cord into the handset jack on the left side of the
telephone. Plug the other end of the coiled handset cord into the handset,
then hang up. 2.
Telephone installation
Connect the power adapter.
Thread the power adapter cord behind the slot at the back of the
telephone base. Then plug the smaller end of the power adapter into the
jack labeled
9V AC POWER on the back of the telephone. Plug the power
adapter into an electrical outlet not controlled by a wall switch.
3.
Check for a dial tone.
Press
LINE 1, then lift the handset or press SPEAKER and listen for a dial
tone. Then press LINE 2 and listen for a dial tone. If there is no dial tone,
see Troubleshooting on page 58.
Confirm Lines 1 and 2.
Press
LINE 1 and dial one of the telephone numbers. If there is a busy
signal, line is the number you called. If line 2 rings, line 2 is the number
you called.
4.
5.
POWER jack
Slot
Power adapter
Electrical outlet not controlled
by a wall switch