Insert the screws into the holes on the card, and tighten the screws to secure the card.
Connect cables to appropriate ports of the card. For details about pin assignments, refer to
"4.7.1 DOORPHONE Card (KX-NS0161)" and "4.9 Connecting to a Doorphone, Door Opener, and/or
Make sure to connect cables after installing the card in the PBX, not before.
4.2.5 Installing/Removing the Optional Service Cards