WaveWare comPPage PIA-3264 - Manual (Page 5)

Paging Interface Adapter
The Paging Interface Adapter (PIA3264) is upgradeable to 64 inputs by installing additional Logic Cards
(CTBD4) that will activate four inputs per card.
5
Main Board
Contact Logic Board
ENSURE ALL POWER IS REMOVED BEFORE INSTALLING OR REMOVING
THE CONTACT LOGIC BOARD