Panasonic KX-TD816 Installation Manual page 72

2.4 Installation of Optional Cards and Unit
Backup Battery and Adaptor Card, Doorphone Card for KX-TD816
Doorphone
Card
Connector
Backup
Battery
Connector
Front Cover
is open.
Caller ID Card for KX-TD816
72
Under this board
Install Backup Battery and
Adaptor Card, KX-A216.
Operates all the features in the event of a
power failure.
Install Doorphone Card, KX-TD160.
This card connects two doorphones and two
door openers.
Install Caller ID Card, KX-TD193.
This card supports the Caller ID
service of the central office.
General Installation