CS5121 Telephone User's Manual
www.vtechphones.com
2
Getting started
Use only the 
power adapter 
supplied with this 
product. To order 
a replacement, 
visit our website at 
www.vtechphones.
com or call 
1 (800) 595-9511. 
In Canada, go to 
www.vtechcanada.
com or call 1 (800) 
267-7377.
The power adapter 
is intended to be 
correctly oriented 
in a vertical 
or oor mount 
position. The 
prongs are not 
designed to hold 
the plug in place 
if it is plugged into 
a ceiling or an 
under-the-table/
cabinet outlet.
•
•
Telephone base
Telephone line cord
Electrical outlet 
(not controlled by 
a wall switch)
Telephone base 
power adapter
Telephone 
wall jack
Telephone base installation
Install the telephone base as shown below. Make sure that the electrical outlet 
is not controlled by a wall switch. If you subscribe to high-speed Internet service 
(Digital Subscriber Line - DSL) through your telephone lines, you must install a 
DSL lter between the telephone base and the telephone wall jack. The lter will 
prevent noise and caller ID problems caused by DSL interference. Please contact 
your DSL service provider for more information about DSL lters.
DSL lter (not included) 
required if you have 
DSL high-speed 
Internet service 
DC 7.5V










