ADLINK cPCI-3971 - Manual (Page 85)

Getting Started 71
cPCI-3970
5.4 CompactFlash Installation
The CompactFlash socket is located on the DB-3CF daughter
board mounted on layer-1. To install a CF card, orient the card so
that the bottom side is facing up and align with the CF socket as
shown. Insert the CF card into the socket until it is fully seated and
flush with the ejector button.